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《岩石学报》2016年第32卷第10~12期发表论文已被Web of Science核心合集收录

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PT J
AU Xu, ZQ
Zhao, ZB
Peng, M
Ma, XX
Li, HQ
Zhao, JM
AF Xu ZhiQin
Zhao ZhongBao
Peng Miao
Ma XuXuan
Li HuaQi
Zhao JunMeng
TI Review of "orogenic plateau"
SO ACTA PETROLOGICA SINICA
AB Plateaus on earth can be subdivided into two categories: craton plateau and orogenic plateau. Craton plateau normally developed on Precambrian basement or stable craton, which is characterized by simple, homogeneous, stable, cold and strong old basement, such as Brazilian Plateau, Colorado Plateau, Ethiopia Plateau, South African Plateau, Middle Siberia Plateau, Deccan Plateau, and so on. Basement of orogenic plateau is always composed by different orogenic units. The orogenic plateau could be separated into subducted orogenic plateau and collisional orogenic plateau two groups. The Middle Andean Plateau, formed overlying eastward subducted Pacific plate, belongs the subducted orogenic plateau. While, the Tibetan Plateau possess complex and uninformed soft basements which have experienced multiple phase orogeny. New research results illustrate that the Tibetan Plateau begin uplifted during Early Cretaceous, it may be related with closure of Bangong-Nujiang Ocean at 120 similar to 140Ma. However, India-Asian collision (60 similar to 50Ma) and concomitantly low angle under thrust of Indian lithosphere beneath Tibetan Plateau lead to the Plateau finally elevated over 4000 similar to 5000m.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3557
EP 3571
UT WOS:000391345300001
ER  

PT J
AU Wang, YY
Gao, LE
Zeng, LS
Chen, FK
Hou, KJ
Wang, Q
Zhao, LH
Gao, JH
AF Wang YaYing
Gao LiE
Zeng LingSen
Chen FuKun
Hou KeJun
Wang Qian
Zhao LingHao
Gao JiaHao
TI Multiple phases of cretaceous mafic magmatism in the Gyangze-Kangma area, Tethyan Himalaya, southern Tibet. 2016
SO ACTA PETROLOGICA SINICA
AB A large number of E-W trending subparallel diabases occurred in the Gyangze-Kangma area, eastern Tethyan Himalaya, southern Tibet. Results from field observation, zircon U-Pb dating, whole-rock geochemical and Sr-Nd isotopic data indicate that they represent at least three episodes of Cretaceous mafic magmatism within the Tethyan Himalaya at similar to 140Ma, similar to 120Ma, and similar to 90Ma, respectively. (1) The T0907 suite, occurred at 142. 0 +/- 1. 4Ma, is characterized by OIB-like trace element patterns and Sr-Nd isotopic compositions, similar to those in the similar to 132Ma Comei-Bunbury Large Igneous Province to the east. However, the contemporaneous T0902 suite shows elevated Mg, Cr and Ni contents, but Nb-Ta negative anomalies, Pb positive anomalies and negative epsilon(Nd)(t) values, which could be derived from an enriched lithospheric source; (2) The T0904 suite, formed at 121. 1 +/- 0. 7Ma, displays N-MORB-like geochemical characteristics; (3) The T0901 suite, formed at similar to 90Ma, displays E-MORB-like geochemical characteristics. Combined with the evolutional history of the breakup of the East Gondwana continent and the hotspot track of the Kerguelen mantle plume, we suggest that the mafic magmatism at similar to 140Ma in Gyangze-Kangma area represents the products from interaction between the Kerguelen mantle plume and the overlying East Gondwana continental lithospheric mantle, possibly due to relatively long-time incubation of the Kerguelen mantle plume beneath the East Gondwana supercontinent. However, with the breakup of the East Gondwana continent and the initiation and spreading of the Indian oceanic ridge, the Indian continent started to drift away from the Kerguelen hotspot. Mafic magmatism at similar to 120Ma and similar to 90Ma in this studied area represent the products formed by partial melting of asthenosphere mantle under Indian ridges, rather than the products of Kerguelen mantle plume. Data presented above indicates that mafic rocks within the Himalayan terrane were produced by multiple episodes of magmatism associated with the breakup of the East Gondwana continent and the intitiation and spreading of the Indian Ocean since similar to 140Ma. These mafic rocks formed at different times provide important time frames for paleomagentic studies and further constrains on the tectonic history of the Himalayan orogenic belt.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3572
EP 3596
UT WOS:000391345300002
ER  

PT J
AU Yu, SB
Qiu, JS
Wang, RQ
AF Yu SiBin
Qiu JianSheng
Wang RuiQiang
TI Petrogenesis of the Daju composite granite pluton in the middle segment of the Gangdese belt: Constraints from zircon U-Pb ages, elemental geochemistry and Hf isotopes
SO ACTA PETROLOGICA SINICA
AB This paper presents comprehensive zircon U-Pb ages and Hf isotopic compositions, and whole-rock geochemistry for the Daju composite granite pluton in the middle segment of the Gangdese belt, with the aims of elucidating the formation mechanism and evolution process of their magmas, and gaining new insights into their petrogenesis. According to the lithological and petrographic characteristics, this pluton can be divided into two units, i.e., the Changna (CN) unit and the Sangga (SG) unit. The CN unit consists mainly of granodiorites with abundant dioritic enclaves, while the SG unit is composed of medium to fine-grained monzogranites with generally homogenerous lithology. Zircon LA-ICP-MS U-Pb dating yields coeval ages of 52. 7 +/- 0. 7Ma for the granodiorites and of 52. 3 +/- 0. 6Ma for the enclosed dioritic enclaves in the CN unit, while the monzogranites of the SG unit were emplaced at 45.3 +/- 0. 7Ma. Geochemically, all rocks of the two units show sub-alkaline and metaluminbus signatures, with agpaitic index (AKI) values mostly less than 0. 9 and aluminum saturation index (A/NKC) values less than 1.0, thus can be grouped into metaluminous calcakaline I-type granites. They are also enriched in LREEs and LILEs (e.g., Rb, Pb), and depleted in HFSEs (e.g., Nb, Ta, Ti), showing the geochemical characteristics of arc magma rocks. Compared with granodiorites in the CN unit, the monzogranites in SG unit are rich in silicon and alkali, and have higher Rb/Sr and Rb/Ba ratios, and display more pronounced negative europium anomalies, indicating that the SG unit had experienced higher degrees of differentiation. The granodiorites and the enclosed dioritic enclaves in CN unit show accordantly depleted Hf isotopic compositions with epsilon(Hf)(t) values ranging from +4.6 to + 11. 5, and from +5. 0 to + 11. 1, respectively. The monzogranites in SG unit also show depeleted Hf isotopic compositions but with relatively wide variation range for epsilon(Hf)(t) values (= -0.5 similar to +14. 7). Based on a synthesis of petrography, geochronology, elemental and isotopic geochemistry and tectonics, we suggest that the granodiorites and the enclosed dioritic enclaves in CN unit were generated by mixing of depleted mantle derived magma and its induced juvenile crustal-melting magma. The monzogranites of the SG unit were emplaced after further differentiation of the mixed magma, and the ancient India crustal materials were most likely involved in their petrogenesis.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3597
EP 3612
UT WOS:000391345300003
ER  

PT J
AU Lu, TY
He, ZY
Zhang, ZM
Shui, XF
Yan, LL
AF Lu TianYu
He ZhenYu
Zhang ZeMing
Shui XinFang
Yan LiLi
TI Magma mixing of the Nyemo post-collisional granite from the Gangdese magmatic belt, Tibet: Evidence of microstructures
SO ACTA PETROLOGICA SINICA
AB The interaction between different melts during magma mixing process would have an influence on the nucleation and growth of the crystals, and could generate complex compositional variations within mineral or form disequilibrium textures between minerals. The Nyemo monzogranite is located in the middle of the Gangdese magmatic belt, and was typically formed in a post-collisional tectonic setting. In this study, the internal texture and chemical composition of plagioclase and amphibole from the Nyemo monzogranite have been analyzed in detail, and many disequilibrium textures have been revealed, including the resorption zone in plagioclase with harbor, round or sieve shapes, the spike composition zone in plagioclase and the occurrence of biotite mantled by amphibole. The An contents of the spike zone (37. 6 similar to 40. 6) and the resorption zone (48. 2 similar to 59. 5) are evidently higher than the An contents of other domains in the same plagioclase grain (18. 4 similar to 26. 4), indicating a change of magma composition during the crystallization of the plagioclase which may be resulted from a magma mixing event. Some biotite grains are mantled by euhedral amphibole and show harbor shaped rims. The resorption of biotite may be related to the rise of magmatic temperature during the magma mixing process, and the amphibole mantle was probably crystallized from the mixed magma. Therefore, the microstructures revealed from the Nyemo monzogranite provide new evidence for the magma mixing and evolution processes of the Gangdese magmatic belt.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3613
EP 3623
UT WOS:000391345300004
ER  

PT J
AU Dong, HW
Xu, ZQ
Li, Y
Liu, Z
AF Dong HanWen
Xu ZhiQin
Li Yuan
Liu Zhao
TI Genesis and geological significance of Early Jurassic gabbro in Medog area, the eastern part of the Gangdese magmatic belt
SO ACTA PETROLOGICA SINICA
AB This paper reports whole-rock major and trace element, LA-MC-ICP-MS zircon U-Pb ages, zircon Hf isotopic and Sr-Nd isotopic compositions from the gabbro occurring in Medog area, the eastern part of the Gangdese magmatic belt. LA-MC-ICP-MS zircon U-Pb isotopic dating indicates that the Medog gabbro emplaced at 185. 97 +/- 0. 33Ma. It contains SiO2 of 48. 19% similar to 54. 93%, MgO of 4. 53% similar to 12. 76% and Mg-# of 50. 0 similar to 67.4. It is characterized by its high content of CaO (7. 44% similar to 12. 11%), low content of alkali (Na2O =0. 93% similar to 2. 36% and K2O =0. 49% similar to 2. 21%). The REE distribution patterns are quite similar to that of the E-MORB. The trace elements such as Sr, V, Sc is enriched, while the HFSE such as Nb, Ta, Zr, Hf is depleted. The gabbro has higher epsilon(Nd)(t) values (-3. 06 similar to 2. 84) and lower initial Sr-87/Sr-86 ratios (0. 7059 similar to 0. 7103). The Medog gabbro is heterogenous in zircon epsilon(Hf)(t) values (- 4. 1 similar to 0), yielding relatively ancient zircon Hf crustal modal ages of 866 similar to 1036Ma. Combining with regional geology, geochronological, geochemical and isotopic data, we propose that the eastern part of the Gangdese magmatic belt was under the Neotethyan subduction setting during the Early Jurassic.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3624
EP 3634
UT WOS:000391345300005
ER  

PT J
AU Xiong, FH
Yang, JS
Gao, J
Lai, SM
Chen, YH
Zhang, L
AF Xiong FaHui
Yang JingSui
Gao Jiang
Lai ShenMing
Chen YanHong
Zhang Lan
TI Feature of Zedong podiform chromitite, eastern Yarlung-Zangbo suture zone in Tibet
SO ACTA PETROLOGICA SINICA
AB The Zedong ophiolite is in the eastern Yarlung-Zangbo suture zone (YZSZ) of Tibet, which consists chiefly of mantle peridotite, with lesser amounts of pyroxenite and gabbro. Seven small, lenticular bodies of chromitite ore have been found in the harzburgite, with ore textures ranging from massive to disseminate to sparsely disseminate. Individual ore bodies are 0.5 similar to 3m long, 0.2 similar to 1m wide and strick NW, parallel to the main structure of the peridotite, both of them are high-Cr chromitite (Cr-# = 67. 9 similar to 88. 5). The mineralogy and geochemistry of the Zedong peridotites suggest that they formed originally at a mid-ocean ridge (MOR) and were later modified by suprasubduction zone (SSZ) melts. Platinum group elements (PGE) of Zedong ophiolite have negative slope patterns with enrich Os, Rh, Pd, loss of Ir, Ru and Pt, indicating the process of modified by melt/fluid. Compare to Luobusa podiform chromitite and peridotite in mineral assemblages, mineral chemistry and geochemistry show that there are many similar character, even existence a good prospecting space.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3635
EP 3648
UT WOS:000391345300006
ER  

PT J
AU Zhang, L
Yang, JS
Liu, F
Lian, DY
Huang, J
Zhao, H
Yang, Y
AF Zhang Li
Yang JingSui
Liu Fei
Lian DongYang
Huang Jian
Zhao Hui
Yang Yan
TI The South Gongzhucuo peridotite massif: A typical MOR type peridotite in the western Yarlung Zangbo suture zone
SO ACTA PETROLOGICA SINICA
AB The South Gongzhucuo ophiolite is located to the south of Gongzhu Lake, Ali area, Tibet, belonging to the southern sub belt of the western Yarlung-Zangbo ophiolitic belt. The South Gongzhucuo ophiolite is mainly composed of mantle peridotites and gabbro dikes. About 80 percent peridotites are harzburgites and 20 percent are lherzolites, few of them are dunites. Mineral chemistry of the South Gongzhucuo peridotites are characterized by low Fo contents (89. 3 similar to 91. 4) of olivine; high Al2O3, contents (1. 89% similar to 6. 06%) in pyroxenes; and low Cr-# values (12. 7 similar to 28. 3) of Cr-spinet. Compared to the primitive mantle, the South Gongzhucuo peridotites have relatively higher MgO contents, and lower CaO, Al2O3, and TiO2 contents. The total rare-earth element (REE) contents of the South Gongzhucuo harzburgites and lherzolites are 0. 66 x 10(-6) similar to 1. 10 X 10(-6) and 0. 90 x 10(-6) similar to 3.78 x 10(-6), respectively, which are significantly lower than those of the primitive mantle. The chondrite-normalized REE patterns of the South Gongzhucuo mantle peridotite display slight enrichments in LREE. In the primitive mantle-normalized spider diagrams, the South Gongzhucuo peridotites exhibit intensively positive U anomalies, slightly positive Nd anomalies, and intensively negative Zr anomalies. The PGE contents of South Gongzhucuo harzburgites and lherzolites are 15. 26 x 10(-9) similar to 25. 23 x 10(-9) and 18. 74 x 10(-9) similar to 26. 86 x 10(-9), respectively. The chondrite-normalized PGE patterns of the South Gongzhucuo peridotites are consistent with that of the primitive mantle. Mineral and whole-rock geochemical characteristics of the South Gongzhucuo peridotites show an affinity to abyssal peridotites, indicating that it may have formed in the mid-ocean ridge setting. Through quantitative modeling, we conclude that the South Gongzhucuo peridoties formed after at most 16% degree of partial melting of the spinel-phase lherzolite mantle source. The LREE enrichments and relatively high Pd/Jr and Rh/Ir ratios suggest that they have experienced melt-rock reaction. Thus, we conclude that the South Gongzhucuo mantle peridotites have suffered low degrees of partial melting in the spinel-lherzolite stability field beneath a mid-ocean ridge environment, and were modified by melt-rock reaction in the same tectonic setting.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3649
EP 3672
UT WOS:000391345300007
ER  

PT J
AU Guo, GL
Yang, JS
Liu, XD
Xu, XZ
Wu, Y
AF Guo GuoLin
Yang JingSui
Liu XiaoDong
Xu XiangZhen
Wu Yong
TI In situ research on PGM in Luobusa ophiolitic chromitites, Tibet: Implications for the crystallization of the chromite
SO ACTA PETROLOGICA SINICA
AB This paper study on the in-situ distribution of PGM in three mining areas in the Luobusa deposit, various PGMs and its microstructure obtained so far from each mining area suggesting that PGM can record the evolutions of the host chromitites. In situ PGMs results from Luobusa mining area show that the parental melts in Luobusa chromitite have a condition with high temperature and low sulfur fugacity, suggesting the chromite forms during the process of melting rock reaction and/or crystallization differentiation. The PGM occurrence in Kangjinla mining area are mainly composite phase inclusions in chromitites, also a few single phase PGM host in the fracture, which implying the parental melts of Kangjinla chromite origin from the melt mingling process, and modified by hydrothermal fluid at the later stage. The PGM obtained from Xiangkashan chromitites sample mostly are awaruites, which occurred in the fracture or intercrystalline in chromitites. Maybe subjected to the process of serpentinisation and/or hydrothermal metamorphism after the chromite crystallization. Mineral associations and microstructure of platinum-group minerals (PGM) can provide an efficacious clue to understand the physical and chemical conditions during the crystallization of chromitite. Therefore, PGMs in situ study is significant for us to understand the formation of unusual mineral preserved in chromitite and the crystallization of chromitite, and the study on PGMs combining in-situ examination and mechanical separation can obtain both their abundance and textural information.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3673
EP 3684
UT WOS:000391345300008
ER  

PT J
AU Zhang, X
Li, XP
Wang, ZL
Zhao, LQ
Shi, TQ
Duan, WY
AF Zhang Xin
Li XuPing
Wang ZeLi
Zhao LingQuan
Shi TongQiang
Duan WenYong
TI Mineralogical and petrogeochemical characteristics of the garnet amphibolites in the Xigaze ophiolite, Tibet
SO ACTA PETROLOGICA SINICA
AB Within the Xigaze ophiolitic melang of the central Yalung Zangpo Suture Zone, we found garnet amphibolites of the metamorphic sole, and investigated the mineral chemistry, metamorphic P-T condition and geochemistry of garnet amphibolites. On the basis of mineral assemblages, four metamorphic stages of garnet amphibolites were distinguished as Am-1 + Pl(1) + Ep(1) + Ttn (M1); Grtc + Cpx-e + Ep(2) + Pl(2) + Rt (M2); Grt-r + Ep(3)/Czo(3) + Cpx-l + Am-3, + Pl(3), + Ttn (M3) and Prh + Ab + Czo + Chl + Cal (M4), respectively. In light of the P-T pseudosection in the SAFMCNHO system, combined with traditional geothermobarometer, the garnet amphibolites were proposed to have experienced pre-peak metamorphism with P-T conditions of 560 similar to 620 degrees C/9. 1 similar to 9. 8kbar; peak metamorphism 830 similar to 870 degrees C/18. 0 similar to 22. Okbar, retrograde stage 640 similar to 680 degrees C/10. 7 similar to 14. 9kbar, and finally ended within sub-green schist facies, figuring out an anticlockwise P-T path. Major elements show that rocks are low-K tholeiitic, with low TiO2 (0. 92% similar to 1. 29%), K2O (<0. 26%) and Na2O (0.24% similar to 2. 46%). The chondrite-normalized Rare Earth Elements (REEs) and primitive mantle-normalized multi-element patterns are similar to N-MORB, with depletion in light of REEs, but they show significant enrichment of large ion lithophile elements (LILEs, Rb, Ba, U) and partly depleted in high field stretch elements (HFSEs, Nb, Ti, Zr and Hf). Geochemical studies indicate that investigated rocks have affinities with N-MORB and arc-related components where is sourced from Supra Subduction Zone (SSZ) environment. The existence of the Bailang garnet amphibolite presents that the Xigaze ophiolite has been emplaced soon after it formed within an intra-oceanic subduction/emplacement.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3685
EP 3702
UT WOS:000391345300009
ER  

PT J
AU Yu, SY
Zhang, JX
Li, SZ
Sun, DT
Li, YS
Peng, YB
AF Yu ShengYao
Zhang JianXin
Li SanZhong
Sun DeYou
Li YunShuai
Peng YinBiao
TI "Barrovian-type" metamorphism and in situ anatexis during continental collision: A case study from the South Altun Mountains, western China
SO ACTA PETROLOGICA SINICA
AB Both metapelite and metabasite experienced medium-pressure granulite-facies metamorphism in the Tula area, South Altun. The metapelite is mainly composed of garnet + sillimanite + feldspar + biotite + quartz, and the mafic granulite consists of garnet + clinopyroxene + orthopyroxene + plagioclase + quartz. Anatexis of the metapelite is evidenced by petrological study in field and microscopy texture: (1) mineral assemblage of K-feldspar + quartz + plagioclase within garnet represents pseudomorphism of earlier melts; (2) microcline recognized along grain boundary of irregular biotite, indicating breakdown of biotite; (3) string of K-feldspar along boundary of quartz, plagioclase or K-feldspar; (4) irregular K-feldspar along garnet and sillimanite, suggesting that the garnet and sillimanite represent the residuum. Zircon U-Pb data indicate that both granulite-facies metamorphism and anatexis occurred simultaneously at similar to 450Ma. Therefore, medium-pressure granulite-facies metamorphism and anatexis occurred 40 similar to 50Myr later than the eclogite and HP granulite in the South Altun. However, it is controversial that the similar to 450Ma metamorphism, anatexis and magmatism define an independent tectonothermal event or overprinting of deep subducted continental slab.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3703
EP 3714
UT WOS:000391345300010
ER  

PT J
AU Zhang, C
Liu, XY
Yang, JS
Li, P
Zhang, LF
AF Zhang Cong
Liu XiaoYu
Yang JingSui
Li Peng
Zhang LiFei
TI The Neoproterozoic metamorphism of North Qaidam UHPM belt, western China : Constrain from petrological study and monazite dating of paragneiss
SO ACTA PETROLOGICA SINICA
AB The poly-phase orogeny information included in one orogenic belt is the key for studying the regional tectonic evolution at different time period. It also has important significance of understanding the rock association and geochemical evolution of different orogeny. However, the later orogenesis always fully or partially erases the information about the early orogenesis, making it much harder to investigate the metamorphism and geochronology information of the poly-phase orogenesis. Monazite, as a common accessary mineral in paragneiss, has high closure temperature of the U-Th-Pb isotopic system and essential to the fluid and metamorphic P-T conditions, making it much easier to record the abundant geochronological information about the poly-phase orogenesis. In-situ electron microprobe monazite dating method makes it possible to connect the geochronological information and the mineralogical characteristics and metamorphic reactions in order to get the P-T-t path of the mineral assemblage with different ages. We have combined in-situ electron microprobe monazite dating method with petrological investigations on the garnet-bearing kyanite/sillimanite biotite gneiss from the Xitieshan terrane of North Qaidam Caledonia ultrahigh pressure metamorphic belt and yielded 886 +/- 18Ma Grenville ages. The rare earth element distribution pattern is similar with the Neoproterozoic ones in the literature. By means of traditional mineral geothermobarametry, the high amphibolite facies 607 similar to 727 degrees C, 6.5 similar to 10. Okbar conditions has been conducted, which is slightly higher than the P-T condition recorded by the Paleozoic paragneiss. Compare with the trace element geochemistry with the Paleozoic paragneiss, the Grenville paragneiss are characterized by high total rare earth element and obvious Eu negative anomaly (Eu/Eu * = 0.50) with correspondingly be depleted in Ba and Sr element, which shows the active continental margin sediment characters. By reviewing the Grenville orogenesis and the formation and decomposition of the super-continent Rodinia globally, we consider that the North Qaidam UHP belt is related to the active continental margin region during the formation of super-continent Rodinia at Grenville age.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3715
EP 3728
UT WOS:000391345300011
ER  

PT J
AU Yuan, TY
Zhao, ZB
Zeng, QG
Liu, Y
AF Yuan TingYuan
Zhao ZhongBao
Zeng QingGao
Liu Yan
TI Petrological characteristics of the eclogite from Gemuri area, northwestern Tibet, and tectonic implications
SO ACTA PETROLOGICA SINICA
AB Occurring in the Longmu Co-Shuanghu suture zone, the Gemuri eclogite is an important component of the central Qiangtang high-pressure metamorphic belt, which was previously regarded as a consequence of cold subduction of the Palaeo-Tethyan Oceanic crust. Mineral assemblages of the Gemuri eclogite can be divided into four stages. The first stage consists of Fe3+ -bearing CaNa amphibole, paragonite, albite, chlorite, quartz, allanite enriched in LREE, Th and U, sphene and Mn-rich garnet core. The mineral assemblage of the second stage is composed of Mg-rich garnet, Fe-poor omphicite, trace-element-free clinozoisite, quartz, paragonite, rutile and pyrite. The third stage includes the Fe-rich garnet occurring in the rims of garnet porphyroblast, albite, chlorite, sphene and actinolite. The last stage is composed of magnetite, trace-element-free epidote and needlelike ilmenite. Semiquantitatively thermodynamic modeling has revealed that the core garnet was formed at T = 644 degrees C, P = 13. Okbar, lgfO(2) = -16.3 similar to -16.4, while the mantle garnet was formed at T = 695 degrees C, P = 16. 6kbar, lgfO(2), = -19.0 similar to -19. 5, indicating that the Gemuri eclogite is an intermediate-temperature eclogite rather than a cold eclogite as previously thought. In combination with previous studies, our work further suggests that tectonic evolution of the Palaeo-Tethyan Ocean is more complex than previously thought. Not only cold, but also intermediate-temperature oceanic subduction occurred. The Gemuri eclogite has suffered reduction in the prograde stage. The early Fe3+ -bearing Ca-Na amphiboles, allanites enriched in LREE, Th and U, as well as other water -bearing minerals formed at high oxygen fugacity are transformed into garnets, Fe-poor omphacites and trace-element-free clinozoisite, releasing water, REE, Th, U, and Ba in the subduction channel. However, none of the neogenic minerals in the exhumation stage contain these trace elements, suggesting that the trace elements were likely released from the subducted slabs, and then transferred to the overlying mantle wedge along with fluids. Our studies further illustrate that the processes responsible to the mass transferring from the down going slabs to the overlying mantle wedge are driven by the prograde metamorphism and reduction together. This highlights the origin of island-arc magmatic rocks with unique arc geochemical characteristics.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3729
EP 3742
UT WOS:000391345300012
ER  

PT J
AU Xu, XY
Cai, ZH
He, BZ
Yang, YX
Cheng, MW
He, C
AF Xu XiaoYin
Cai ZhiHui
He BiZhu
Yang YouXing
Cheng MuWei
He Cui
TI Thrust system and its evolution in eastern part of the basin-range junction belt between the West Kunlun and Tarim Basin
SO ACTA PETROLOGICA SINICA
AB The basin-range junction belt between Tibetan Plateau and Tarim Basin featured by deformation structure of thrust system, is an ideal object to study the relationship between Tibetan Plateau and Tarim Basin, is an important potential area to explore oil. Through field geological survey, satellite image interpretation and major seismic section interpretation, we analyzed the characteristics of thrust system in the basin-range junction belt of the West Kunlun-Tarim Basin, discussed its forming time combined with previous studies. We regard the thrust system of the northwestern Tarim basin-range junction belt composed of several thrust sheets which formed after Miocene and are younger increasingly from south to north. We illustrated its deformation extent and evolution process using balanced section technique. The upper crust shortening rate of the basin-range belt in Cenozoic is 36% similar to 38% and mainly occurred after Miocene. The thrust system is a result of remote effect of Cenozoic India-Asian collision event.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3743
EP 3752
UT WOS:000391345300013
ER  

PT J
AU Wang, N
Wu, CL
Ma, CQ
Lei, M
Guo, WF
Xin, Z
Chen, HJ
AF Wang Nan
Wu CaiLai
Ma ChangQian
Lei Min
Guo WenFeng
Zhang Xin
Chen HongJie
TI Geochemistry, zircon U-Pb geochronology and Hf isotopic characteristics for Granites in southern Dunhuang block
SO ACTA PETROLOGICA SINICA
AB Numerous Paleozoic granitoids emplaced in Dunhuang block. Aiming to better understand the tectonic evolution of Dunhuang block and the geodynamic significance, in this paper, Anpengou composite granites and Xiaocaohu granite in southern Dunhuang block were chosen to study by means of petrography, geochemistry, zircon U-Pb chronology and Hf isotopic analyses. The results show that: (1) the two granites had different rock assemblage types. Anpengou composite granites were mainly composed of Early Paleozoic syenogranite emplaced during the Silurian period (431Ma) and granite emplaced during the Devonian period (similar to 360Ma) and the Carboniferous period (similar to 340Ma), while Xiaocaohu porphyritic granite was emplaced during the Carboniferous period (similar to 340Ma). (2) Both Anpengou syenogranite and granite showed S-type granite features and similar Hf isotopic characteristics, with epsilon(Hf)(t) ranging from -11.7 to -6.3 and -12.3 to -5.5, and two-stage model age was varied in 1.8 similar to 2. 2Ga and 1.7 similar to 2.1Ga, respectively. Both source rocks of the Early Paleozoic syenogranite and the Late Paleozoic granite derived from meta-greywacke with part of metapelitic materials of Paleoproterozoic to Mesoproterozoic. Xiaocaohu porphyritic granite showed features of adakitic rocks and was generated by partial melting of thickened crust, with epsilon(Hf)(t) ranging from -16.7 to -4.9 and two -stage model age was varied in 1. 8 similar to 2.4Ga, indicating that the source rocks of Xiaocaohu porphyritic granite derived from the Paleoproterozoic crustal materials. In addition, some of the source rocks of the two granites may be related to the assemblage and break-up of Columbia supercontinent. (3) The residual rocks of Anpengou syneogranite, Anpengou granite and Xiaocaohu porphyritic granite were granulite, amphibolite and granulite-amphibole eclogite, which reflected the differences in the formation depth and grade of metamorphism. (4) The Early Paleozoic orogenic movement of Dunhuang block ended much later than the Central Orogenic Belt, but exhibited closely temporal-spatial coupling retionship with the Tianshan-Beishan orogenic belt in timing limitation and the distribution of the Paleozoic granites. Therefore, we proposed that the Dunhuang block was involved in the orogenic event of the Central Asian Orogenic Belt in both Early Paleozoic and Late Paleozoic.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3753
EP 3780
UT WOS:000391345300014
ER  

PT J
AU Ma, SW
Xu, ZQ
Zhang, ZK
Ma, Y
Zhao, ZB
Pang, X
Zhao, XW
Wang, H
AF Ma ShiWei
Xu ZhiQin
Zhang ZhongKun
Ma Yuan
Zhao ZhongBao
Pang Xue
Zhao XiaoWu
Wang Hui
TI Structural deformation and its constrains of mineralization of the Jiama copper-polymetallic deposit, southern Tibet
SO ACTA PETROLOGICA SINICA
AB Jiama copper polymetallic deposit locates in the middle-east part of the Gangdese metallogenic belt and is a typical large "collision" type deposit. The Jiama porphyry deposit is mainly skarn-type ore bodies associated hornfels-type and porphyry-type ore bodies. The mainly skarn-type ore bodies as a layered thick plate are distributed in the interlayer tectonic belt between Late Jurassic Duodigou Formation and Early Cretaceous Linbuzong Formation. Through detailed filed and core geological observation on the structural deformation features associated with the mineralization, since the Cenozoic, Jiama and its adjacent area have experienced two main regional deformation evens. The first deformation (D-1) associated with the subduction-collision of India-Eurasian plates developed a series of isoclinal folds and an interlayer tectonic belt between Late Jurassic Duodigou Formation and Early Cretaceous Linbuzong Formation, which probably provided important space for the development of Jiama deposit. The second deformation (D-2) formed a series of vertical or inclined slanting folds and reconstruction the D, folds. The contact part between Duodigou Formation and Linbuzong Formation existed thrust shearing action. The thrust fault and folds compose Jiama fold-thrust belt (Jiama decollement). The EBSD fabric result of quartz and calcite in mylonite showed that the Jiama decollement formed in the low temperature (about 400 degrees C). Four types of mineralization were founded spatially associated with the D-2 deformation. 1) The type 1 exists in the interlayer fracture of S-1, foliation and the metasandstone, which is folded with S-1, foliation together. 2) The type 2 is quartz sulfide veins that are parallel or cut across S-1, foliation were folded. 3) The type 3 is skarn-type ore bodies distributed in the interlayer tectonic belt. Banded skarn and copper mineralization had developed. 4) The type 4 is mainly quartz sulfide veins or carbonate sulfide veins with no deformation. We report new zircon U-Pb ages about 16.4Ma of the deformed granite veins. Combined with previous molybdenite Re -Os (14.5 similar to 15. 7Ma) and zircon U-Pb (14.1 and 14.2Ma) dating results, the second deformation (D-2) probably happened between 14 similar to 17Ma. Therefore, the second deformation (D-2) probably controlled the Jiama copper deposit. This study presents the structure and Mineralization process of Jiama copper polymetallic deposit and have important significance for further guide for regional prospecting.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3781
EP 3799
UT WOS:000391345300015
ER  

PT J
AU Cao, H
Vervoort, J
Wang, D
Li, GX
Neill, O
AF Cao Hui
Vervoort Jeff
Wang Da
Li GuangXu
Neill Owen
TI Triassic monazite ages and its geological significance of garnet-mica schist in Fenzishan Group, Jiaobei Massif
SO ACTA PETROLOGICA SINICA
AB The inclusion trail of garnet porphyroblasts in garnet-mica schists of Fenzishan Group, Jiaobei Massif record the multistage deformation and metamorphism history during rock formation. Garnets with clear zonation structures can be divided into core, mantle, and rim based on electron microprobe compositional mapping. The content variation of MgO, FeO, MnO, and CaO in garnet shows that the temperature of core to rim first increased then decreased, indicating prograde to retrograde metamorphism. The Y content in monazite decreases from the core to rim based on the compositional mapping of monazite grain. The 232.6 +/- 1.1Ma similar to 229.5 +/- 3.7Ma monazite U-Pb ages correspond to the prograde metamorphic growth process of garnet. Combined with 1869 +/- 72Ma zircon U-Pb age, it can be inferred that the garnet-mica schist in the Fengzishan Group has undergone at least two metamorphic events in the Paleoproterozoic and Triassic. The garnet-mica schist in the Fenzishan Group records the subduction-collision orogenic process of the Sulu UHP metamorphic belt in Triassic. The electron microprobe analysis of garnet shows an almandine composition, and indicates it had experienced mid-level regional metamorphism. It further indicates that although the garnet-mica schist in the Fenzishan Group was involved in the Triassic subduction-collision orogenic process of the Sulu UHP metamorphic belt, the subduction depth it reached was not very deep. This can be explained by the subduction erosion model for continental subduction process, and provides evidence for the hypothesis of deep subduction erosion model of continent-continent collision for the formation of the Sulu HP-UHP metamorphic terrain, which mentioned that part of Jiaobei Massif was partially dragged down during the 240 similar to 220Ma Yangtze plate subduction process. Further study is required to demonstrate if Jiaobei Massif experienced deep subduction UHP metamorphism.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3800
EP 3816
UT WOS:000391345300016
ER  

PT J
AU Chen, WW
He, BZ
Xu, ZQ
Cai, ZH
Rao, CL
Xiao, ZY
Yu, TX
Yu, ZY
AF Chen WeiWei
He BiZhu
Xu ZhiQin
Cai ZhiHui
Rao CunLi
Xiao ZhongYao
Yu TengXiao
Yu ZhuoYing
TI The thermal evolution history of Tangguzibas depression in the Meso-Cenozoic based on constraints of fission track method: Manifestation of the tectonic movements in Tibet Plateau
SO ACTA PETROLOGICA SINICA
AB The Mesozoic in the Tangguzibas depression was seriously absent, the reconstruction of tectonic evolution and uplifting process in this area is difficult during the Mesozoic. Low temperature thermal chronology technology of fission track is used in the thermal history of sedimentary basin in recent years, which is currently used in the geological thermal events dating, geological body thermal evolution history, tectonic uplift and denudation, and so on. It has its unique superiority; especially it can provide the processes of thermal history for lost many strata areas in superimposed basins. Based on fission track experiments, thermal evolution history simulation of drilling core samples in TangCl well, combined with stratigraphic development, this study reveals the thermal evolution of Tangguzibas depression in Meso-Cenozoic. Since Mesozoic, there are five cooling stages in the process of thermal evolution of Tangguzibas depression, including 248 similar to 240Ma (Early-Middle Triassic), 199 similar to 120Ma (Late Triassic to Early Cretaceous), 72 similar to 55Ma (Late Cretaceous to Paleocene), 24 similar to 15Ma (Late Oligocene to Early Miocene) and 7.4 similar to 2.2Ma (Late Miocene to Pliocene). In this five cooling stages, the average cooling rate can be divided into two stages and indicate the increasing in the early and the dropping in the later. The average cooling rate and uplifting rate increase gradually from the Triassic to the Miocene. The maximum average cooling rate attained 4.22 degrees C/Myr in the Early Miocene, and decreased gradually from the Late Miocene to present. The strongest and fastest uplifting occurred in the Tangguzibas depression, which responded with the Middle Himalayan Movement. The longest duration of the cooling and uplifting stages occurred in the Jurassic and early of Middle Cretaceous, the Tangguzibas depression was in the forebulge setting, almost unreceived the deposition of the Jurassic and the Middle and Upper Triassic were eroded during this time. The strata of the Middle and Upper Paleozoic in the Tangguzibas depression were experienced the higher paleo-geothermal before the Early and Middle Triassic, so that the apatites have been completely annealed and the zircons partially annealed, which were different with the Bachu Uplift. The polycycles of the cooling (uplifting) and warming (subsiding) events in the evolution of the Tangguzibas depression during the Meso-Cenozoic are coordinated with the closure of Paleo-Tethyan and Neo-Tethys and continent-continent collisions between the Indian to Asian Plates, as well as responses of the multi-stages tectonic movements of the Tibet Plateau in the Meso-Cenozoic.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3817
EP 3834
UT WOS:000391345300017
ER  

PT J
AU Zhang, RS
Cao, H
Zeng, M
Zhang, DX
Li, GX
AF Zhang RuiSi
Cao Hui
Zeng Min
Zhang DeXian
Li GuangXu
TI Scientific belt lithologic mapping based on ASTER spectral analysis: A case study from the Tashkorgan area (Xinjiang, China)
SO ACTA PETROLOGICA SINICA
AB Scientific belt mapping is based on the key geological question for the mapping area. However, some of the mapping areas are not easy to reach because of the high altitude, and lithologic mapping based on remote sensing image can provide useful information for the mapping project. Advanced Spaceborne Thermal Emission and Reflection (ASTER) remote-sensing data are useful in assisting lithologic mapping and, however, it has been rarely applied by in the Xinjiang and Tibetan areas and its effectiveness in these areas needs to be verified. In this paper, based on combined field geology and ASTER data analysis, we present mapping methodology and results from the Tashkorgan area of western Xinjiang. The Tashkorgan area is a key area for studying the Himalayan Tibetan orogen and the Tethyan ocean evolution. Nonetheless, the high altitude and poor transportation conditions of this area have imposed major difficulties on geological mapping. Lithologic types of the Tashkorgan area mainly include intermediate-high grade metamorphic rocks, Paleozoic (Ordovician, Silurian, Upper Carboniferous and Permian) meta-sedimentary rocks and various types of intrusive rocks. ASTER spectral analysis is shown to be effective identifying and discriminating the lithologic types. In particular, the ASTER TIR bands were processed first to reveal distribution of prominent lithologic types, including quartzose rock, quartz-deficient rock and carbonate and establish references for followed lithologic matching. The VNIR/SWIR band ratio indexes were demonstrated to effectively highlight spectral features related to lithologic composition of Fe3+, Fe-silicate, Al-OH, Mg-OH and carbonate. The lithologic mapping results provide more refined lithologic information than the previous map, which demonstrates the effectiveness of this method. The generalized procedures of ASTER-assisted lithologic mapping are applicable for future geologic mapping projects and studies in the similar areas such as Xinjiang and Tibet.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3835
EP 3846
UT WOS:000391345300018
ER  

PT J
AU Zhang, DX
Cao, H
Zeng, M
Xu, MZ
Li, GX
Xing, XH
AF Zhang DeXian
Cao Hui
Zeng Min
Xu MingZhu
Li GuangXu
Xing XianHong
TI Study on metallogenic genesis and metallogenic settings of Xinjiang "Pamir-type" iron deposit
SO ACTA PETROLOGICA SINICA
AB "Pamir-type" iron deposit is one of the most important categorized magnetite deposits in West Kunlun, Xinjiang, and its metallogenesis is still unclear. Previous studies on geological characteristics, ore-forming ages suggested that these magnetite deposits were obviously distinguished from those typical BIFs magnetite deposits globally. Wengjile magnetite deposit and Zileyi magnetite deposit, two representative magnetite deposits in this region, were selected in this study. Litho geochemistry of admellite and wall rocks, ore-forming minerals characteristics, trace element geochemistry and in situ Pb-Pb isotopic composition of magnetite were discussed in this study to explore the metallognesis and ore-forming background of "Pamir -type" iron deposit. Wengjile magnetite deposit lies in the contact zone between Wengjile biotite-admellite and Paleoproterozoic Bulunkuole Group biotite quartz-schist. The deposit is closely associated with Wengjile biotite-admellite in spatial and temporal. Geochemical characteristic of Wengjile biotite-adamellite is higher in SiO2 (69.10% similar to 74. 51%), Al2O5 (14.24% similar to 16.13%), K2O(4.46% similar to 4.91%) and Na2O (3.82% similar to 4.29%), and lower in MgO (0. 25% similar to 0. 69%), CaO (1.1% similar to 1. 99%) and TiO2 (0.139% similar to 0.398), and has a very narrow variation of Na2O/K2O (0.80 similar to 0. 87) and unanimous Rittmann Index (2.20 similar to 3. 24). Aluminum saturation index (1.44 similar to 1.51) suggested it belonged to a weak peraluminous rock. Total Rare Earth Element is higher (170.4 x 10(-6) similar to 400.5 x 10(-6), and delta Eu (0.44 similar to 0.87) is a strong negative Eu anomaly. The rocks contain variable contents of trace element in the trace element spider diagram, but generally have a similar variation trend such as systematic enrichment of LILE such as K, Rb, Sr, Ba (where Sr > 421 x 10(-6),Ba > 853 x 10(-6)) and REE but depletion of HFSE such as Nb, Ta, P and Ti. The content of the major oxides in Bulunkuole biotite quartz schist are SiO2 (57.07% similar to 60. 99%), and Al2O3 (14.46% similar to 8.61%, MgO (2.22% similar to 3. 60%), CaO (1.12% similar to 2. 86%),TiO2 (0.75% similar to 1. 12%), and are rich in REE (146.0 x 10(-6) similar to 200.5 x 10(-6), and has a median Eu anomaly (delta Eu is 0.65 similar to 0. 74). Trace element analyses suggested there is a lower Rb/Sr ratio (0.16 similar to 0. 89) and obvious depletion of Th, Zr, Hf, Nb, Ta, P and Ti but apparent positive anomaly of barium, which may suggest that the rock has the characteristics of aluminum-rich sedimentary formed in the environment of margin of ancient continental. The geochemical similarity between Wengjile biotite-admellite and Bulunkuole biotite schist demonstrated there is a genetic relationship between them. Zircon LA ICP-MS U-Pb dating of Wengjile biotite-admellite suggested the rocks formed around 15.0 +/- 0.3Ma and 15.4 +/- 0.2Ma. Trace element geochemistry of magnetite using LA ICP-MS indicated that magnetite from Wengjile magnetite deposit has higher Si, Mn, Zn, Pb, Hf, Sn and variable Mn and Ga, and magnetite from Zileyi magnetite deposit has relatively higher LILE such as Mg, Al, Ti, V, Co, Ni, Sc and lower variable Mn and Zn. In contrast, the range of variation of trace elements in magnetite from the Wengjile magnetite deposit is relatively larger, while the range of magnetite in the Zileyi magnetite deposit is relatively small.
The Pb-Pb isotopes of the magnetite from the two deposits are distinctly different. The Pb-206/Pb-204 of the magnetite from Wengjile magnetite deposit varied from 9. 0699 to 41. 4030 with an average value of 20. 4808, and Pb-207/Pb-204 varied between 11.0454 and 34. 1993 with an average of 17. 5573; and Pb-208/Pb-204 varied between 28. 6800 and 84. 1533 with an average value of 44. 8547. The Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 of the magnetite from Zileyi magnetite deposit are lower. The calculated isotope ratios of Pb-206/(204) Pb varied from 0.67 to 1.37 with an average of 1. 16; (208)pb/(206)ph varied from 1.85 to 3 61 with an average of 2. 24, and Pb-208/Pb-204 between 2.36 and 3.04, with an average of 2.56. Pb-Pb isotope results indicated that the magnetite from the Wengjile magnetite deposit may be related to biotite-adamellite and is hydrothermal but magnetite from Zileyi was not. In summary, there are not only deposits -related to sediment process, but also some hydrothermal magnetite deposits, which related to magmatic hydrothermal activity in the Tashkurgan region.
SN 1000-0569
EI 2095-8927
PD DEC
PY 2016
VL 32
IS 12
BP 3847
EP 3864
UT WOS:000391345300019
ER  

PT J
AU Hu, RZ
Fu, SL
Xiao, JF
AF Hu RuiZhong
Fu ShanLing
Xiao JiaFei
TI Major scientific problems on low-temperature metallogenesis in South China
SO ACTA PETROLOGICA SINICA
AB Low-temperature metallogenesis in a huge area is very special in the world. The giant South China low-temperature metallogenic domain (SCLTMD) covers an area of around 500,000km(2) in the southwestern Yangtze Block in South China, and is composed of the Chuan-Dian-Qian Pb-Zn, Youjiang Au-As-Sb-Hg and Xiangzhong Sb-Au metallogenic provinces. The SCLTMD hosts numerous Carlin-type gold deposits, MVT Pb-Zn deposits and vein-type Sb, Hg and As deposits, which were basically hosted by sedimentary rocks, formed under low temperature conditions (ca. 100 similar to 250 degrees C) and obviously controlled by fault and fracture systems. Many developments have been obtained from previous studies. However, some crucial scientific problems concerning the accurate mineralization ages, metallogenic geodynamics and processes are still much debatable. Recent studies have shown that these deposits might form dominantly during 200 similar to 230 Ma and 130 similar to 160Ma, corresponding to Indosinian (Triassic) and Yanshanian (Jurassic to Cretaceous) orogenies in South China, and the formation of the deposits were triggered by Indosinian and Yanshanian buried magmatism except the Pb-Zn deposits in the Chuan-Dian-Qian provinces. This special issue reports the latest progresses about this aspect in 20 papers that deal dominantly with the geological and geochemical features, ages of mineralization, origins and tectonic settings of the low-temperature ore deposits formed in the SCLTMD.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3239
EP 3251
UT WOS:000388278500001
ER  

PT J
AU Zhang, Y
Yan, DP
Zhao, F
Li, XT
Qiu, L
Zhang, YX
AF Zhang Yue
Yan DanPing
Zhao Fei
Li XuTuo
Qiu Liang
Zhang YiXi
TI Stratigraphic sequences, abundance anomalies and occurrences of As, Sb, Au, Ag in the Lower Cambrian Niutitang Formation in Kaiyang Phosphate Mine area
SO ACTA PETROLOGICA SINICA
AB The black shale sequences of the Lower Cambrian Niutitang Formation expose well in the Kaiyang Phosphorite area in Guizhou Province. The black shale sequences deposited in a special sedimentary environment with rich polymetallic elements have become the focus of research in recent years. However, the geochemical background anomalies and occurrence of the main elements of low-temperature mineralization, such as As, Sb, Ag, Au in these black shales, have not been documented, and thus the implications were not well understood. In this contribution, stratigraphic sequences along the selected geological profiles are detailed investigated and divided. Geochemistry composition, sulfur isotope composition of whole-rock samples and pyrites are analyzed mainly using ICP-MS and EPMA (electron probe microanalysis), respectively, after sampled the Niutitang Formation profiles methodically and systematically. The results indicate that As, Sb and Ag are enriched in all layers, while Au is enriched in most layers. The enrichment of these four elements show strata-bound characteristics, i. e., there are high positive abundance anomalies of As, Sb, Ag and Au in black dolomite silty shales and black shales with higher content of organic matter in the lower part of the Niutitang Formation, but low abundance anomalies in the layer with higher content of calcium and mixing layers of mudstone and siltstone. Primary pyrites in black shales are the main host mineral for element Au, the important occurrence mineral for element Sb, and the secondary occurrence mineral for elements Ag and As. Meanwhile, different types of pyrites showed different elements enrichment patterns in our analysis. As and Ag are more easily to enrich in irregular aggregate and framboids pyrites, while Sb and Au have higher concentration coefficients in single pyrite grains distributed in matrix.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3252
EP 3268
UT WOS:000388278500002
ER  

PT J
AU Zhu, JJ
Zhong, H
Xie, GQ
Zhao, CH
Xu, LL
Lu, G
AF Zhu JingJing
Zhong Hong
Xie GuiQing
Zhao ChengHai
Xu LeiLuo
Lu Gang
TI Origin and geological implication of the inherited zircon from felsic dykes, Youjiang basin, China
SO ACTA PETROLOGICA SINICA
AB The relationship between the Carlin-type gold deposits with magmatism is still debatable. Numerous Carlin-type gold deposits occur in the Youjiang basin, Southwest China. Due to the limited exposures of magmatic rocks within this region, it is unknown if there is genetic connections between magmatism and gold mineralization. The inherited zircons found in igneous rocks could give insight into the older or hidden magmatic events which are poorly exposed at the surface. The Bama, Liaotun, and Xiabaha quartz porphyry dykes host plenty of inherited zircons, among which the Liaotun and Xiabaha dykes are spatially present within the Liaotun and Mingshan gold deposits, respectively. Five main age clusters at 130 similar to 140Ma, ca. 242Ma, 400 similar to 450Ma, 700 similar to 1000Ma, and 1700 similar to 1800Ma were recognized in the inherited zircons by both LA-ICP-MS and SIMS U-Pb dating. The two younger groups of inherited zircons from the Liaotun and Xiabaha dykes give concordant U-Pb ages of 136.3 +/- 3. 9Ma (2 sigma), 242.3 +/- 1. 7Ma (2 sigma) and 128.2 +/- 2. 3Ma (2 sigma), 243. 1 +/- 3. 6Ma (2 sigma), respectively. All the three dykes intruded the strata including the Middle Triassic Baifeng Formation ( Member 1 and 2; 247 similar to 244Ma) and older sequences. Therefore, those zircons with ages older than the Middle Triassic should be probably captured from the host sedimentary rocks. Conversely, those at 130 140Ma might be derived from the hidden magmatic intrusions. For the zircons at ca. 242Ma, though coeval to the first and second members of the Baifeng Formation, they usually occur as anhedral fractions, indicating they might be inherited from the detrital zircons hosted by the sandstone and siltstone of the Baifeng Formation. Combined with the regional magmatism and geological setting, we propose that the ages of Triassic zircon forming events could represent the magmatic pulse related to the closure of the Paleo-Tethys Ocean. The zircon ages of 130 140Ma and ca. 242Ma are generally consistent with the timing of gold mineralization in the Youjiang basin. Thus, we prefer that there might be genetic links between magmatism and the formation of Carlin-type gold deposits in the Youjiang basin.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3269
EP 3280
UT WOS:000388278500003
ER  

PT J
AU Gan, CS
Wang, YJ
Zhang, YZ
Liu, HC
Zhang, LM
AF Gan ChengShi
Wang YueJun
Zhang YuZhi
Liu HuiChuan
Zhang LiMin
TI The identification and implications of the Late Jurassic shoshonitic high-Mg andesite from the Youjiang basin
SO ACTA PETROLOGICA SINICA
AB The Youjiang basin is located in the joint area of the paleo-Tethys and paleo-Pacific dynamic domains. This paper reports petrographic, geochronological and geochemical data of the Yangtun andesite from the eastern Youjiang basin. The andesite was characterized by porphyrotopic texture. LA-ICP-MS zircon U-Pb dating results give an eruption age of ca. 159Ma for the Yangtun andesite. The andesitic samples are geochemically marked by high MgO (6. 74% similar to 8. 85%), Cr (416 x 10(-6) similar to 565 x 10(-6)) and Ni (207 x 10(-6) similar to 246 x 10(-6)) contents, high Mg-# values (63 similar to 72) and low FeOT/MgO ratios (0. 83 similar to 1. 23), similar to those of typical high-magnesian andesite (HMA). The samples meanwhile belong to the shoshonitic rocks with high K2O (3. 39% similar to 4. 77%) and K2O/Na2O (1. 31 similar to 2. 33). They are strongly enriched in large ion lithophile elements and depleted in high field strength elements, with high Rb/Sr (0. 20 similar to 0. 46) and low Ba/Rb (7. 17 similar to 9. 30) ratios. Isotopically, their (Sr-87/Sr-86), ratios range from 0. 70738 to 0. 70739 and epsilon(Nd) (t) values from -3. 6 to -3. 4. Geochemical and isotopical data indicate that the Yangtun HMA was derived from partial melting of the phlogopite-bearing lithospheric mantle. The Yangtun HMA was generated in the within-plate setting, reflective of lithospheric extension in the Youjiang area during the Late Jurassic.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3281
EP 3294
UT WOS:000388278500004
ER  

PT J
AU Jin, XY
Li, JW
Hofstra, A
Marsh, E
Liu, JZ
Yang, W
AF Jin XiaoYe
Li JianWei
Hofstra, Albert
Marsh, Erin
Liu JianZhong
Yang Wu
TI Relationship between Carlin-type gold deposits and paleo-petroleum reservoirs in SW Guizhou, China: Evidence from gas compositions of fluid inclusions and Raman spectroscopic characteristics of bitumen
SO ACTA PETROLOGICA SINICA
AB Carlin-type gold deposits in SW Guizhou Province, China, represent the world's second largest concentrations of this type of deposits and show a close spatial relationship with paleo-petroleum reservoirs. Whether gold genesis is genetically related to the paleo-petroleum reservoirs, however, remains unclear and debated. New compositional data of fluid inclusions in various ore-related minerals and Raman spectroscopic characterization of disseminated bitumen in high grade ores from selected gold deposits are used to better understand the relationship between gold mineralization and hydrocarbon generation in the region. Arsenic, and commonly auriferous pyrite, quartz, calcite, and fluorite, which typically formed in different paragenetic stages of gold mineralization, have comparable species, contents, and variation patterns of hydrocarbons. This observation indicates minimum decomposition or restructuring of organic ionic compounds during the evolution of ore-fluids. It is thus inferred that organic matters had a negligible role in carrying gold in the ore-forming fluids as previously suggested. In the N-2/Ar versus CO2/CH4 diagram, analyses from various minerals show a positive correlation extending from a circulating meteoric water field to magmatic fluid field, indicating that the inclusion fluids most likely represent mixture of gaseous species derived from deep concealed magma chamber and circulating meteoric water. It is also noteworthy that one quartz sample from the Shuiyindong gold deposit deviates significantly from the main trend and approaches the organic component field, reflecting abnormal high contents of organic components in the fluid inclusions trapped during the ore-fluid migration. Bitumen disseminations in high grade ores from the selected gold deposits show consistent Raman spectroscopic patterns and therefore are considered to have a similar origin. Based on the Raman spectroscopic data of bitumen, the early-stage ore fluids have calculated temperatures of 317 similar to 336 degrees C, which are significantly higher than paleogeothermal temperatures of 160 similar to 250 degrees C and homogenization temperatures of fluid inclusions of regional paleo-oil reservoirs (73 similar to 175 degrees C). The abnormally high temperatures of ore fluids suggest that regional paleogeothermal field was insufficient to provide heat source responsible for ore-fluid transportation and gold mineralization. Instead, the heat source was mostly likely provided by deep-seated magma chambers. In conclusion, we suggest that Carlin-type gold deposits in SW Guizhou were distal products of deep-seated magmatic hydrothermal systems, and had no genetic relationship with paleo-oil reservoirs in the region. Gold- and hydrocarbon-bearing fluids were derived from different sources but may have been driven by the same thermal event and shared the same structures during their transportation and deposition.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3295
EP 3311
UT WOS:000388278500005
ER  

PT J
AU Chen, X
Su, WC
Huang, Y
AF Chen Xian
Su WenChao
Huang Yong
TI He and Ar isotope geochemistry of ore-forming fluids for the Qinglong Sb deposit in Guizhou Province, China
SO ACTA PETROLOGICA SINICA
AB The Qinglong Sb deposit locates within the Youjiang Au-Sb-As-Hg metallogenic province in South China low-temperature metallogenic domain. This paper reports He and Ar isotopic data of fluid inclusions trapped by stibnites from the Qinglong Sb deposit with age of about 150Ma. He-3/He-4 ratios range from 0. 13 to 0. 46Ra (where Ra is the He-3/(4)Heratio of air = 1. 4 x 10(-6)), and Ar-40/Ar-36 from 305 to 327. Moreover, there are some positive correlations between He and Ar isotopic compositions. The results suggest that the ore-forming fluids are a mixture between a crustal fluid containing atmospheric Ar and crustal He-4 and a fluid containing mantle components. It is likely that the former is a low temperature meteoric fluid, and the later is a fluid exsolved from a concealed Jurassic granitic magma, which might be formed by crustal melting induced by intrusion of a mantle-derived magma, similar to the contemporaneous W-Sn deposits-related granites in the Cathaysian Block of South China. The Jurassic deep-seated magma triggered the fluids of possibly meteoric origin to circulate and leach out ore-forming elements from sedimentary rocks underlain by the wallrock "Dachang Formation" of the deposit to form the Qinglong Sb deposit.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3312
EP 3320
UT WOS:000388278500006
ER  

PT J
AU Dong, WD
Shen, NP
Su, WC
Cai, JL
AF Dong WenDou
Shen NengPing
Su WenChao
Cai JiaLi
TI Study on the ore-forming fluid geochemistry of the Anna gold deposit in southeastern Yunnan Province, China
SO ACTA PETROLOGICA SINICA
AB The Anna gold deposit is located at southeastern Yunnan, China, and is hosted in altered Permian diabase intrusion, with intensive milky quartz veins and vienlets. Alteration caused silicification, argillization, carbonatization and sulfidation, similar to those in the sediment-hosted Carlin-type gold deposits in the Dian-Qian-Gui "Golden Triangle" of Southwest China. Petrography, microthermometry, laser Raman spectroscopy analyses of fluid inclusions in quartz, and hydrogen and oxygen isotopic compositions of quartz are used to characterize the ore-forming fluids associated with gold mineralization in the southeastern Yunnan. The results show that the fluid inclusions in quartz are mainly two- or three-phase, aqueous-carbonic inclusions and have higher homogenization temperatures (208 similar to 312 degrees C) and low salinities of 0 similar to 2% NaCleqv, with high density of CO2 and N-2 vapor. Hydrogen and oxygen isotopic compositions of ore fluids (delta D = -79 parts per thousand similar to -47 parts per thousand, delta O-18 = 8. 9 parts per thousand similar to 12. 7 parts per thousand) indicate a metamorphic origin, possibly related to Indosinian orogeny along the southern margin of Youjiang basin during Late Permian to Early Triassic time.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3321
EP 3330
UT WOS:000388278500007
ER  

PT J
AU Pi, QH
Hu, RZ
Peng, KQ
Wu, JB
Wei, ZW
Huang, Y
AF Pi QiaoHui
Hu RuiZhong
Peng KeQiang
Wu JianBiao
Wei ZhaoWen
Huang Yong
TI Geochronology of the Zhesang gold deposit and mafic rock in Funing County of Yunnan Province, with special reference to the dynamic background of Carlin-type gold deposits in the Dian-Qian-Gui region
SO ACTA PETROLOGICA SINICA
AB The Dian-Qian-Gui region, commonly referred as the Golden Triangle' in SW China, hosts many Carlin-type gold deposits. Previously, the relationship between gold mineralization and magmatism has not been well constrained. This paper reports a geochronological study on the Zhesang Carlin-type gold deposit and mafic intrusion in the Funing County of Yunnan Province, China. Dating by Ar-40/Ar-39 of hydrothermal sericite grains collected from altered rocks near auriferous quartz veins at Zhesang gold deposit yielded a plateau age of 215. 3 +/- 1. 9Ma, which is highly consistent with zircon U-Pb age (215 +/- 5Ma) of the mafic rock in a nearby area. It is inferred that there might exist contemporaneous buried intrusions in the Zhesang deposit. The deep-seated magma, resulted from the post-collision of the Indochina Block with the South China Block, triggered fluids of possibly meteoric origin to circulate and leach out ore-forming elements from sedimentary rocks to form the Zhesang Carlin-type gold deposit.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3331
EP 3342
UT WOS:000388278500008
ER  

PT J
AU Wei, DT
Xia, Y
Tan, QP
Xie, ZJ
Yan, J
Guo, HY
Liu, JZ
AF Wei DongTian
Xia Yong
Tan QinPing
Xie ZhuoJun
Yan Juno
Guo HaiYan
Liu JianZhong
TI Comparative study of the wallrock and ore and ore forming mechanisms at the Nibao gold deposit, Guizhou, China
SO ACTA PETROLOGICA SINICA
AB The majority of the orebodies at the Nibao gold deposit are controlled by a reverse fault and an unconformity between the Middle Permian and Upper Permian stratigraphic units. In this paper, based on petrographic study, X-ray diffraction (XRD) analysis and microprobe analysis (EMPA) were integrated to identify and quantify the altered minerals and gold bearing arsenian pyrite, make a comparative study of the characteristics between the wallrock and the ore. Major and trace element analyses were used to determine the element fluxes during mineralization. The main objective of this paper is to understand the relationship between altered minerals and the ore forming, and the ore-forming mechanisms at the Nibao gold deposit. The results indicate that pyrite shows a negative correlation with quartz and a positive correlation with illite. Ore samples have undergone decarbonation, and pyrite in the ore samples generally shows core-rim texture. A part of wallrock samples also have undergone decarbonation, but pyrite in the wallrock samples does not show core-rim texture. Au was added to the ore, while CaO, MgO, S, Ba and Be were removed from the wallrock in the uncomformity. In the reverse fault, Au, Sc, As and Fe2O3 were added to the ore while SiO2, CaO, Sr, W and Be show the characteristics of being removed from the wallrock. The integrated results suggest that decarbonation and sulfidation are the main ore forming mechanisms at the Nibao gold deposit. Before mineralization, decarbonation provides favor environment for ore forming. During the ore forming process, minerlization through sulfidation to form gold bearing arsenian rims on pyrite.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3343
EP U337
UT WOS:000388278500009
ER  

PT J
AU Xie, XY
Feng, DS
Chen, MH
Guo, SX
Kuang, SD
Chen, HS
AF Xie XianYang
Feng DingSu
Chen MaoHong
Guo ShenXiang
Kuang ShunDa
Chen HenShui
TI Fluid inclusion and stable isotope geochemistry study of the Nibao gold deposit, Guizhou and insights into ore genesis
SO ACTA PETROLOGICA SINICA
AB The Nibao gold deposit is a composite gold deposit dominated by fault-controlled type orebody and supplemented by stratabound type orebody located in platform area in the Southwest Guizhou Province. Fault-controlled type orebody is mainly developed in the low angle thrust fault, stratabound type orebody mainly above fault-controlled type orebody which developed in the core of dome structure in the Upper Permian Longtan Formation and Middle Permian Dachang layer. The ore-forming process can be divided into quartz-pyrite stage, quartz-pyrite-arsenopyrite stage and calcite-quartz-polymetallic sulfide +/- fluorite stage from early to late base on crosscutting relationships and mineral assemblages.
Two types orebody have the same types of fluid inclusions, including aqueous inclusions, CO2-H2O inclusions and mono-phase CO2 inclusions. In stratabound type orebody, the homogenization temperature values of fluid inclusions in quartz range from 194 to 305 degrees C, with salinities range from 0. 70% to 7. 81% NaCleqv, delta O-18(V-SMOW), values of quartz range from 22. parts per thousand to 23. 6 parts per thousand, yield delta(OH2O)-O-18 values from 12. 6 parts per thousand to 13. 5 parts per thousand, delta D-H2O values of fluid inclusions in quartz from -84 parts per thousand to -62 parts per thousand in the early stage. The homogenization temperature values of fluid inclusions in quartz range from 125 to 278 degrees C, with salinities range from 0.53% to 6.46% NaCleqv, delta O-18(V-SMOW) values of quartz range from 16. 6 parts per thousand to 23. 5 parts per thousand, yield delta O-18(H2O) values from 4. 4 parts per thousand to 11. 3 parts per thousand, delta D-H2O values of fluid inclusions in quartz from -80 parts per thousand to -65 parts per thousand in the middle stage.
The homogenization temperature values of fluid inclusions in calcite range from 133 to 197 degrees C, with salinities range from 0. 53% to 7. 45% NaCleqv and homogenization temperature values of fluid inclusions in fluorite range from 102 to 264 degrees C, with salinities range from 0. 18% to 4. 49% NaCleqv, delta O-18(V-SMOW) values of calcite range from 20. 6 parts per thousand to 22. 7 parts per thousand, yield delta O-18(H2O) values from 8. 3 parts per thousand to 10. 4 parts per thousand, delta D-H2O values of fluid inclusions in calcite from -56 parts per thousand to -47 parts per thousand, delta C-13(V-PDB) values from -6. 6 parts per thousand to -1. 6 parts per thousand in the late stage.
In fault-controlled type orebody, the homogenization temperature values of fluid inclusions in quartz range from 126 to 296 degrees C, with salinities range from 0. 35% to 8. 29% NaCleqv, delta O-18(V-SMOW) values of quartz range from 21. 9 parts per thousand to 23. 7 parts per thousand, yield delta O-18(H2O) values from 9. 8 parts per thousand to 11. 6 parts per thousand, delta D-H2O values of fluid inclusions in quartz is -85 parts per thousand in the middle stage. The homogenization temperature values of fluid inclusions in calcite range from 118 to 236 degrees C, with salinities range from 0.53% to 7. 02% NaCleqv, delta O-18(V-SMOW) values of calcite range from 19. 8 parts per thousand to 21. 5 parts per thousand, yield delta O-18(H2O) values from 8.7 parts per thousand to 10.4 parts per thousand, delta D-H2O values of fluid inclusions in calcite from - 67 parts per thousand to - 55 parts per thousand, delta C-13(V-PDB) values from - 7. 0 parts per thousand to -4.7 parts per thousand in the late stage.
Fluid inclusions and stable isotope study results in this deposit show that two types orebody have a consistent properties and source of ore-forming fluid, and experience a similar evolutionary process. The ore-forming fluid is derived from the mixing of meteoric water and sea water and the proportion of sea water is gradually increasing from early to late, the carbon is mainly derived from dissolution of marine carbonate rocks.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3360
EP 3376
UT WOS:000388278500010
ER  

PT J
AU Ye, L
Li, ZL
Hu, YS
Huang, ZL
Zhou, JX
Fan, HF
Danyushevskiy, L
AF Ye Lin
Li ZhenLi
Hu YuSi
Huang ZhiLong
Zhou JiaXi
Fan HaiFeng
Danyushevskiy, Leonid
TI Trace elements in sulfide from the Tianbaoshan Pb-Zn deposit, Sichuan Province, China: A LA-ICPMS study
SO ACTA PETROLOGICA SINICA
AB The Sichuan-Yunnan-Guizhou Pb-Zn mineralization province is an important part of the large-scale low-temperature metallogenic domainin southwestern China, and there are different opinions about the genetic type of Pb-Zn ore deposit in the area. Analyzed by LA-ICPMS with mapping for the Tianbaoshan Pb-Zn ore deposit, Huidong, Sichuan Province, China, it is researched on the trace elements in sphalerite and galena and its existing state from the deposit in the paper. The results show that the sphalerite is characterized by enrichment of Cd, Ge and depleted in Fe, Mn, In, Sn, Co, and those trace elements occur as isomorphous substitution in the sphalerite with a wide content range, related possibly to the low temperature ore-forming fluid which come from the basin brine.
In the process of long distance migration of the fluid with a long time, the different trace elements were leached out from different basement strata by the fluid, resulted in the formed sulfide minerals were rich in low temperature elements with a wide content range. There is a good positive correlation between Ge and Cu in the sphalerite, implying the replacement mechanism is nCu(2+) + Ge2+ <-> (n + 1) Zn2+, which is an important possible factor of the enrichment of Ge in the deposit. The galena is characterized by enrichment of Ag, Sb and depleted in Bi with trace Cd and Tl, which occur as isomorphous substitution in the galena, and the replacement mechanism is (Ag)(1+) + (Sb)(3+) <-> 2Pb(2+). Apart from this, our research shows that the occurrence of Ge is dominated by the sphalerite rather than the galena.
In brief, the trace elements in sulfide from Tianbaoshan Pb-Zn ore deposit are similar to that of MVT Pb-Zn deposit, and different with that of exhalative sedimentary type deposit, magmatic hydrothermal type deposit and skarn deposit. The Pb-Zn mineralization formed at low temperature (<200 degrees C), and the ore forming fluid migrated from the bottom to the top. It is suggested that the ore genesis of Tianbaoshan Pb-Zn deposit belong to the MVT deposit, while the sphalerite is rich in Cu and the galena is rich in Ag, implying a special ore forming process.
RI
Zhou, Jia-Xi  A-8653-2012 
OI
Zhou, Jia-Xi  0000-0002-8032-4691  
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3377
EP 3393
UT WOS:000388278500011
ER  

PT J
AU He, CZ
Xiao, CY
Wen, HJ
Zhou, T
Zhu, CW
Fan, HF
AF He ChengZheng
Xiao ChaoYi
Wen HanJie
Zhou Ting
Zhu ChuanWei
Fan HaiFeng
TI Zb-S isotopic compositions of the Tianbaoshan carbonate-hosted Pb-Zn deposit in Sichuan, China: Implications for source of ore components
SO ACTA PETROLOGICA SINICA
AB The Tianbaoshan Pb-Zn ore deposit, hosted in the Dengying Formation dolostone, is located at the southwestern part of the Yangtze Block. The source of ore components is still controversial, although a lot of studies have been published. In this study, zinc and sulfur isotopic compositions of microdrilled sphalerites, handpicked sphalerites from three adits and the wall rocks are investigated. The microdrilled sphalerite samples exhibit the homogenous Zn isotopic composition (delta(66) Zn = 0. 39 parts per thousand to 0. 52 parts per thousand, on average of 0. 46 parts per thousand), and the homogenous S isotopic composition (delta(34) s(CDT) = 4. 24 parts per thousand to 4. 87 parts per thousand, on average of 4. 59 parts per thousand). These characters indicate that sphalerite may be simultaneously precipitated from a hydrothermal fluids with homogeneous composition at the small scales (10 x 10cm(2)). In contrast, Zn isotopic compositions of handpicked sphalerites from three adits show a wide range from 0. 15 parts per thousand to 0.73 parts per thousand. The early sphalerites from the same hand specimen are enriched the isotopically heavier Zn, suggesting the heavier zinc isotopic compositions in the early stages ore-forming fluids compared to the late stage ore-forming fluids. Zinc isotopic compositions of sphalerites from three adits are substantially become lighter from 8 to 6 aditat at the large scales, which are controlled by variable zinc isotopic compositions of ore-forming fluids and migratory routes of ore-forming fluids. The delta Zn-66 values of the Dengying Formation dolostone show a narrow range from 0. 06 parts per thousand to 0. 35 parts per thousand (on the average of 0. 21 parts per thousand), which indicates the loss of isotopically heavier Zn during the hydrothermal fluids leaching processes. However, the Tianbaoshan Formation sandstone yield a positive delta Zn-66 value (0. 62 parts per thousand), representing zinc isotopic composition of the primary deposition. Finally, this study indicates that the zinc of Tianbaoshan lead-zinc ore deposit may be derived from the Dengying Formation dolostone, but the contributions of basement and sedimentary covers overlying the Dengying Formation dolostone cannot be excluded. Sulfur may be mainly derived from sedimentary strata with the mixing of S from the mantle.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3394
EP 3406
UT WOS:000388278500012
ER  

PT J
AU Sun, HR
Zhou, JX
Huang, ZL
Fan, HF
Ye, L
Luo, K
Gao, JG
AF Sun HaiRui
Zhou JiaXi
Huang ZhiLong
Fan HaiFeng
Ye Lin
Luo Kai
Gao JianGuo
TI The genetic relationship between Cu- and Zn-dominant mineralization in the Tianbaoshan deposit, Southwest China
SO ACTA PETROLOGICA SINICA
AB The Tianbaoshan, a typical Zn-Pb deposit in the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province, is hosted by dolostone of Upper Sinian Dengying Formation. Recently, a Cu-dominant mineralization was discovered in the deep of the Tianbaoshan deposit and even formed Cu ore body. However, the origin of the Cu ores and the genetic relationship between Cu- and Zn-dominant mineralization are still unclear. This paper presents the mineralogical and isotope geochemical data of the Cu ores, integrates with those of Zn-Pb ores, in order to revealing the sources of ore-forming mineralized elements, and discussing its ore genesis and the genetic relationship with Zn-Pb ores. The microscopic observation and scanning electron microscope (SEM) analysis indicate that Cu ores are mainly composed of chalcopyrite and freibergite, followed by galena and arsenopyrite, with a small number of sphalerite and pyrite. Sphalerite is the main sulfide mineral in Pb-Zn ores, followed by galena and pyrite, with a little of chalcopyrite and pyrargyrite. In the Cu ores, sphalerite occurs as subhedral-xenomorphic granular and coexists with chalcopyrite or enclosed by chalcopyrite grain, while galena fills into the fracture of chalcopyrite, freibergite and arsenopyrite as veinlet or occurs as xenomorphic granular that was enclosed by those minerals. In the Pb-Zn ores, chalcopyrite presents as disseminated structure and distributes in sphalerite. The mineralogy, textures and structures of metal minerals in Cu- and Zn-dominant ores suggest that chalcopyrite has closely symbiotic, inserted and enclosed relationship with sphalerite and galena, and they should be formed at the same time. delta S-34(CDT) values of chalcopyrite from Cu -dominant ores range from 3. 9 parts per thousand to 4. 2 parts per thousand (mean 4. 1 parts per thousand, n = 3), similar to those of sphalerite from Zn-dominant ores (3. 3 parts per thousand to 3. 9 parts per thousand, mean 3. 5 parts per thousand, n = 3), indicating that the sources of reduced sulfur for the two types of ores are similar and all are mainly related to the sulfate in evaporites within ore-hosting strata. Pb-206/Pb-204, (207)pb/Pb-204 and Pb-208/Pb-204 values of chalcopyrite from Cu-dominant ores range from 18.441 to 18.476 (mean 18.461, n = 3), 15.731 to 15.751 (mean 15.741, n = 3), and 38.809 to 38.873 (mean 38.849, n = 3) with mu values range from 9.72 to 9.76, similar to those of galena from Zn-dominant ores (Pb-206/ Pb-204 = 18.442 similar to 18.480 (mean 18.455, n = 3), Pb-207/Pb-204 = 15.746 -15.763 (mean 15.752, n = 3), Pb-208/Pb-204 = 38.793 - 38.892 (mean 38.840, n = 3), and mu = 9.75 -9.78). This reveals a clearly crustal source of Pb, and Cu-dominant ores have the same metal sources to the Zn-dominant ores, which are all related to upper crust (the ore-hosting sedimentary rocks). Studies on mineralogy, textures and structures, S and Pb isotope geochemistry demonstrate that the sources of newly found Cu ores and Pb-Zn ores are the same, and the two types of ores were belonged to one hydrothermal system and they were the produces formed at the same age with different ore-forming stages. The ore genesis of the Tianbaoshan Cu-Pb-Zn deposit is absolutely different from MVT deposit, suggesting a special mineralization (environment) related to local geological setting. This paper has vital guiding significance for Cu ore prospecting in the deep of the Pb-Zn deposits in the SYG province, western Yangtze Block, SW China.
RI
Zhou, Jia-Xi  A-8653-2012 
OI
Zhou, Jia-Xi  0000-0002-8032-4691  
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3407
EP 3417
UT WOS:000388278500013
ER  

PT J
AU Liang, F
Bi, X
Feng, C
Tang, Y
Wei, D
Dai, Z
AF Liang Feng
Bi XianWu
Feng CaiXia
Tang YongYong
Wei DongXiao
Dai ZhiHui
TI Mineralogical and geochemical characteristics of carbonate and implications for ore-forming mechanism of the Fule Pb-Zn deposit, Yunnan Province, China
SO ACTA PETROLOGICA SINICA
AB The Fule Pb-Zn deposit is located in the southeastern part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn mineralization district, which hosts significant Pb-Zn-Ag-dispersed elements deposits in China. Applying detailed mineralogy and elements analysis to the gangue minerals of the Fule Pb-Zn deposit, this paper reveals the characteristics and sources of ore-forming fluid, to help us understand the mechanism of mineralization. Based on the paragenesis sequence of the Fule deposit, the major elements and trace elements of gangue minerals were analyzed via Electron Probe Microanalyze (EPMA) and Laser Abrasion (LA)-ICPMS. Trace elements of carbonate in the Fule deposit reveal that there is a trend from various Eu anomaly to positive Eu anomaly and from a strong negative Ce anomaly to weak negative Ce anomaly, indicating precipitation of sulfide and dolomite are due to decreases of f(o2), temperature and pH. There is a trend of decrease of Fe and Mn from early to late mineralization, indicating Fe and Mn were released in a low pH environment and incorporated into dolomite. The Sr concentration of carbonate show an increasing trend, indicating the fluid continued to react with the wall rock, incorporating more Sr. Dolomite and calcite Fe-Sr and Mn-Sr illustrate that there are mixing of two fluids. We propose that mineralization is a result of mixing of metal-rich, oxidized acidic fluid and reduced alkaline fluid.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3418
EP 3430
UT WOS:000388278500014
ER  

PT J
AU Zhu, LY
Su, WC
Shen, NP
Dong, WD
Cai, JL
Zhang, ZW
Zhao, H
Xie, P
AF Zhu LuYan
Su WenChao
Shen NengPing
Dong WenDou
Cai JiaLi
Zhang ZhengWei
Zhao Hai
Xie Peng
TI Fluid inclusion and sulfur isotopic studies of lead-zinc deposits, northwestern Guizhou, China
SO ACTA PETROLOGICA SINICA
AB Sediment-hosted lead-zinc deposits in northwestern Guizhou, China, are located on the southwest margin of the Yangtze craton and Youjiang orogenic belt. They are hosted by Proterozoic and Paleozoic carbonate rocks, and consist mainly of sphalerite, galena, and pyrite, with quartz, calcite and dolomite veins. Petrography, microthermometry, laser Raman spectroscopy analyses of fluid inclusions in quartz and sphalerite, and sulfur isotopic compositions of sulfides are used to characterize the ore-forming fluids associated with Pb-Zn mineralization in the northwestern Guizhou. The results show that the fluid inclusions in quartz are two-phase, aqueous inclusion and have higher homogenization temperatures (160 similar to 260 degrees C) and salinities of 10% similar to 22% NaCleqv, with low density of CO2, CH4 and N-2 whereas the homogenization temperatures of two-phase aqueous inclusion in sphalerite range from 160 180 degrees C, with salinities of 3% similar to 23% NaCleqv. Sulfur isotopic compositions of sulfides indicate that reduced sulfur was mainly derived from the host rocks. We proposed that fluid mixing between metal-rich brines and reduced sulfur-bearing sedimentary formation waters is the most efficient process for Pb-Zn ore mineral precipitation.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3431
EP 3440
UT WOS:000388278500015
ER  

PT J
AU Jin, ZG
Zhou, JX
Huang, ZL
Luo, K
Gao, JG
Peng, S
Wang, B
Chen, XL
AF Jin ZhongGuo
Zhou JiaXi
Huang ZhiLong
Luo Kai
Gao JianGuo
Peng Song
Wang Bing
Chen XingLong
TI Ore genesis of the Nayongzhi Pb-Zn deposit, Puding City, Guizhou Province, China: Evidences from S and in situ Pb isotopes
SO ACTA PETROLOGICA SINICA
AB The Nayongzhi Pb-Zn deposit discovered during 2011 to 2015, in the north-central part of the SE wing Wuzhishan anticline, is located in the western Yangtze Block, Southwest China and is an important component of the NW Guizhou Pb-Zn metallogenic district. In the Nayongzhi mining area, more than twenty Pb-Zn ore bodies have been controlled until now, with more than 1.35 million tones of Zn and Pb metal reserves at grades range from 1.11% to 15.65% Zn and 0.59% to 0.97% Pb, respectively, indicating that the Nayongzhi deposit is the largest Pb-Zn deposit in the Guizhou part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province. Ore bodies in this deposit mainly occur as stratiform, stratiform-like, lentoid (scrotiform) and steep veined. Besides the steep veined ore bodies occur along F-7 thrust fault, the other types of ore bodies were hosted by dolostone of Lower Cambrian Qingxudong Formation and Upper Sinian Dengying Formation and had the similar occurrence to that of the ore-hosting strata. Ore bodies are characterized by massive, brecciated, veinlet and disseminated. Ore minerals are given priority to with sphalerite, followed by galena and pyrite. Gangue minerals are mainly calcite and dolomite, with a small amount of quartz and barite. delta S-34(CDT) values of sulfide minerals range from 15.94 parts per thousand to 25.49 parts per thousand (mean 22.41 parts per thousand, n = 21), of which pyrite has delta S-34(CDT). value of 22.06 parts per thousand, sphalerite has delta S-34(CDT), values ranging from 19.37 parts per thousand to 25.49 parts per thousand (mean 23.17 parts per thousand, n = 17) and galena has delta S-34(CDT), values ranging from 15.94 parts per thousand to 19.70 parts per thousand (mean 18.23 parts per thousand, n=3). The delta S-34 values of pyrite, sphalerite and galena do not present the feature of delta S-34(pyrite) > delta S-34(sphalerite) > delta S-34(galena), suggesting that the sulfur isotope fractionation in hydrothermal system did not reach balance. Together with a small amount of barite in sulfide ores, we believe that the delta S-34(Sigma s), value of hydrothermal fluid was higher than those of sulfide minerals. Therefore, reduced sulfur in the ore-forming fluid was likely the produce of marine sulfate in the ore-hosting Cambrian and Sinian strata by thermal-chemical reduction. In situ Pb isotopes of galena analyzed by fs LA-MC-ICPMS demonstrate that Pb-206/Pb-204 = 17.828 17.860 (average 17.841), Pb-207/Pb-204 = 15.648 -15.666 (average 15.659), Pb-208/Pb-204 = 37.922 - 37.979 (average 37.960, n = 32). These Pb isotopic data plotted into the average evolution curve of upper crust, indicating a clearly crustal source of Pb and the basement rocks was likely the most sources. Studies on ore deposit geology, mineralogy, S isotopes and in situ Pb isotopes reveal that the Nayongzhi Pb-Zn deposit is a MVT deposit with mixed fluids from basement and wall rocks, respectively, which formed sulfide ores likely during Yanshanian and related to the evolution of the Youjiang basin.
RI
Zhou, Jia-Xi  A-8653-2012 
OI
Zhou, Jia-Xi  0000-0002-8032-4691  
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3441
EP 3455
UT WOS:000388278500016
ER  

PT J
AU Zhang, DL
Huang, DZ
Zhang, HF
Wang, GQ
Du, GF
AF Zhang DongLiang
Huang DeZhi
Zhang HongFa
Wang GuoQiang
Du GaoFeng
TI Chronlogical framework of basement beneath the Xianmgzhong Basin: Evidence by U-Pb ages of detrital zircons from Xikuangshan
SO ACTA PETROLOGICA SINICA
AB The systematic LA-ICP-MS U-Pb dating on detrital zircons from Late Paleozoic sedimentary rocks in Xikuangshan mining area, Xiangzhong Basin, shows that their concordant ages ranging from 3400Ma to 350Ma. On the age spectrum, these zircons can be divided into several groups with different ages, indicating the existence of physical responses to major pre-Indosinian tectonic events in Central Hunan. According to age structure of zircons within different periods of time, together with regional tectonic evolution, the basement-cover framework of Xiangzhong Basin, from bottom to top, was established as crystalline basement (>1.9Ga), metamorphic basement (1.90.54 Ga), low (or non) metamorphic basement (0.540.41Ga), and surface sedimentary cover (<0.41Ga) Combined age spectrum of these strata, as well as corresponding tectonic histories, formation environment of each material layer within the basement-cover frame also has been discussed. Moreover, by comparing age structure of zircons in lamprophyre with zircons in sedimentary rocks, and combined with field geological observations and previous studies, the majority of zircons within the lamprophyre were suggested as residual grains during the melt formation, but not xenocrysts captured from wall rocks during the melt (or dyke) ascending. Most of those zircons were crystalized in 840 700Ma suggest the lamprophyre melt formed at middle-upper metamorphic basement beneath this basin, and thus the position of material-providing layer for lamprophyre melt and other relative fluids is well definited within the basement-cover frame. These works will provide important evidences for further understanding about coupling relationship between magmatism and superlarge-scale Sb mineralization in Xikuangshan.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3456
EP 3468
UT WOS:000388278500017
ER  

PT J
AU Chen, YW
Bi, XW
Fu, SL
Dong, SH
AF Chen YouWei
Bi XianWu
Fu ShanLing
Dong ShaoHua
TI Zircon U-Pb dating and Hf isotope of the felsic dykes in the Longshan Au-Sb deposit in Central Hunan Province and their geological significance
SO ACTA PETROLOGICA SINICA
AB This study presents a systematic geochemistry, zircon U-Pb dating and Hf isotope analysis on the felsic dykes outcropped around the Longshan Au-Sb deposit, aiming to constrain the intrusion ages, nature of sources and the tectonic setting of these felsic dykes and provide some new insights on the genetic relationship between the Longshan Au-Sb mineralization and magmatism. Zircon U-Pb dating results show that the felsic dykes occurred in five different locations around the Longshan Au-Sb deposit yield the same crystallization ages of 220 similar to 217Ma (Late Indosinian). The Hf isotopes of the felsic dykes show the nearly identical characteristics with Hf-176/Hf-177 ratio of 0.282264 similar to 0.282536, epsilon(Hf) (t) = -13.4 similar to -3.7, t(DM2) of 2089 similar to 1482Ma. Combining with the elements geochemical characteristics, it suggests that the felsic dykes may have derived from the partial melting of the Paleoproterozoic-Mesoproterozoic meta-sedimentary under a post-collision extensional tectonic setting. The intrusion ages of the felsic dykes are roughly consistent with the ore-forming age of the Longshan Au-Sb deposit, implying that deep-seated magmatism under the deposit may have supplied the part of mineralization hydrothermal fluid components and heat based on the previous studies.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3469
EP U468
UT WOS:000388278500018
ER  

PT J
AU Li, W
Xie, GQ
Zhang, ZY
Zhang, XK
AF Li Wei
Xie GuiQing
Zhang ZhiYuan
Zhang XingKang
TI Constraint on the genesis of Gutaishan gold deposit in central Hunan Province: Evidence from fluid inclusion and C-H-O isotopes
SO ACTA PETROLOGICA SINICA
AB The Gutaishan high-grade gold deposit, located in the Xiangzhong basin, is hosted within Neoproterozoic to Sinian slate and phyllite rocks. Petrographic observation, microthermometric measurements, Raman spectroscopy and H-O isotopes on the fluid inclusions for different stages quartz from the Gutaishan Au deposit were carried out in this study, aiming to show new insights into the origin of ore-forming fluids and understand on ore genesis. Additionally, C-O isotopic analyses of representative hydrothermal ankerite samples were also presented. Fluid inclusions of different stages are generally characterized by two major types: carbon dioxide-bearing inclusions and brine inclusions, and the former type is of the highest abundance within the Au mineralization stage. The homogenization temperature and salinity range from 180 degrees C to 320 degrees C, and 0 to 13% NaCleqv, respectively. Raman spectroscopy analyses show that H2O and CO2 are main components in the measured fluid inclusions, with minor CH4 and N-2. delta O-18(V-SMOW), delta(OH2O)-O-18 and delta DV-SMOW of quartz range from 15.6 parts per thousand to 17.9 parts per thousand, 4.5 parts per thousand to 8.3 parts per thousand, 78 parts per thousand to 49 parts per thousand, respectively, indicating magmatic fluid was possible involved in the ore-forming process. Homogenized carbon (delta C-13(PDB) = -10.3 parts per thousand -8.6 parts per thousand) and oxygen (delta O-18(V-SMOW) = +13.9 parts per thousand similar to + 15.7 parts per thousand) of ankerite collectively suggest a magmatic source. Fluid immiscibility, existence of CH,, together with sulfidation and carbonation in the wallrock and veins, are the key factors to the precipitation of Au. These syntheses of available information lead to the proposal that the Gutaishan gold deposit may represent an atypical orogenic gold deposit.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3489
EP 3506
UT WOS:000388278500019
ER  

PT J
AU Fu, SL
Hu, RZ
Chen, YW
Luo, JC
AF Fu ShanLing
Hu RuiZhong
Chen YouWei
Luo JinCheng
TI Chronology of the Longshan Au-Sb deposit in central Hunan Province: Constraints from pyrite Re-Os and zircon U-Th/He isotopic dating
SO ACTA PETROLOGICA SINICA
AB The Longshan deposit is one of the most important Au-Sb deposits in central Hunan Province. However, the mineralization age of this deposit is still not well constrained due to lacking of suitable minerals for conventional radiometric dating, limiting the recognition of its genesis. Pyrite Re-Os isotopic dating has been proved to be a reliable technique to determine the age of hydrothermal sulfides with low contents of Re and Os, which can be thus used to constrain the age of epithermal mineralization. The zircon U-Th/He isotopic dating is a newly developed technique, which can provide a potential constraint on the ages of low-temperature metallogenic events. Re-Os isotopic dating of the hydrothermal pyrites and U-Th/He isotopic dating of the zircons recording metallogenic event were carried out in this paper, aiming to constrain the mineralization age of the Longshan Au-Sb deposit. Dating results show that the Re-Os isochron age of hydrothermal pyrites is 195 +/- 36 Ma, corresponding to Late Indosinian, whereas the U-Th/He ages of zircons from altered wallrock are 51.2 similar to 133.3Ma. After correction by Ft, the U-Th/He ages are distributing in the range of 93.78 to 258.29 Ma with an average of 160.7 +/- 7.3Ma, corresponding to Early Yanshanian. It can be thus concluded that the Longshan Au-Sb deposit may have experienced two episodes of mineralization (i.e., similar to 200Ma and similar to 160Ma) or the Sb-Au mineralization may have occurred at similar to 200Ma which was remobilized by magmatic event at similar to 160Ma. Pyrite Re-Os age represented the timing of Au-Sb mineralization, whereas the zircon U-Th/He age represented the timing of the second thermal event. Thus, whether the Longshan Au-Sb deposit formed due to the single mineralization event at similar to 200Ma, or also experienced an overlapping of the mineralization event at similar to 160Ma, the two ages were roughly consistent with those of two magmatic events in the district, indicating that magmatism may have played a vital role in the formation of the Longshan Sb-Au deposit.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3507
EP 3517
UT WOS:000388278500020
ER  

PT J
AU Shi, XJ
Zhang, L
Wang, T
Zhang, JJ
Liu, MH
Zhou, HS
Yan, YT
AF Shi XingJun
Zhang Lei
Wang Tao
Zhang JianJun
Liu MingHua
Zhou HongSheng
Yan YuTong
TI Zircon geochronology and Hf isotopic compositions for the Mesoproterozoic gneisses in Zongnaishan area, northern Alxa and its tectonic affinity
SO ACTA PETROLOGICA SINICA
AB Minor Precambrian rocks are exposed in the Zongnaishan area of northern Alxa, and they are mainly composed of metamorphosed supracrustal rocks and meta-intrusive rocks. Revealing the age and origin of the Precambrian rocks is essential for the understanding of the basement characteristic and tectonic architecture. We presented systematic petrology, zircon U-Pb and Hf isotopic studies for the paragneisses and orthogneiss in the southwestern Zongnaishan-Shalazhashan zone (ZSZ). The U-Pb ages of 1459 +/- 11 Ma and 1458 +/- 3Ma were obtained for the biotite-monzonitic gneisses and the augen biotite plagioclase gneiss in Aertengtuoya area respectively, suggesting a Mesoproterozoic magmatic event in the source area. The formation age of the paragneisses should be slightly later than magmatic event. U-Pb dating of the magma zircons from the orthogneiss (amphibole and biotite monzonitic gneisses in the Gashunhuduge area) yield an age of 1433 +/- 17Ma. The high and mainly positive zircon epsilon(Hf) (t) values between +0. 1 and +11. 9 and the zircon Hf model ages of 2. 19 to 1. 44Ga, suggested that the igneous protoliths were mainly derived from the juvenile crustal material. These observations, in combination with previous work, indicated that the basement of ZSZ was composed of Mesoproterozoic (1.4 similar to 1. 5Ga) metamorphosed rocks. These U-Pb zircon age data do not support the existence of exposed Archean-Paleoproterozoic rocks in the ZSZ, and challenge the previous interpretation that the ZSZ was part of the Alxa block during Early Precambrian times.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3518
EP 3536
UT WOS:000388278500021
ER  

PT J
AU Li, S
Ding, L
Fu, JJ
Yue, YH
AF Li Shun
Ding Lin
Fu JiaJun
Yue YaHui
TI Age, provenance and tectonic setting of Dajin conglomerate, Tibet
SO ACTA PETROLOGICA SINICA
AB The Dajin conglomerate that crops out along the southern foot of Mt. Kailas is a matter of concern because of the presence of larger benthic foraminifera in the strata. As the uncertainty of the depositional age, the tectonic setting of this unit is still in debate. In this study, the youngest age cluster of detrital zircons from Dajin conglomerate constrains the maximum depositional age of this unit to be Late Oligocene to Early Miocene (24 similar to 27Ma). Provenance data (field observation, sandstone petrology and detrital zircon U-Pb ages) indicate that the basal and top sections of Dajin conglomerate were derived directly from Gangdese arc, but the middle part of this unit (including the foraminiferal assemblages) was recycled from the Cuojiangding Group in the west. Dajin conglomerate is in conformable contact with the overlying Gangdese conglomerate. The age and provenance results of Dajin conglomerate are also consistent with Gangdese conglomerate. Therefore, we conclude that Dajin conglomerate is part of the Gangdese conglomerate. The strata of Dajin conglomerate are weakly deformed and mostly planar. This unit should be deposited in extensional tectonic regime, which might be related to the rollback and break-off of the down-going Indian plate during Late Oligocene to Early Miocene.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3537
EP U326
UT WOS:000388278500022
ER  

PT J
AU Qu, HJ
Wang, EG
Zhang, L
Li, HL
Kang, YL
Hu, JM
AF Qu HongJie
Wang ErGuo
Zhang Lei
Li HaiLong
Kang YanLi
Hu JianMin
TI Zircon geochronology and its structural implications of Late Mesozoic andesite from the Beijing plain
SO ACTA PETROLOGICA SINICA
AB This paper presents zircon SHRIMP U-Pb age of Well Jr173 and LA-LCP-MS U-Pb age of Well Jr176 andesite samples in the Beijing plain, to constrain the volcanic rocks formation time and their relation to the transformation of geomorphology in Beijing. Zircon grains from the two andesite samples are euhedral the subhedral in shape and show the typical oscillatory zoning with high Th/U ratios, implying that they should be magmatic in origin. The weighted mean Pb-206/U-238 ages of two group' s zircons from the andesite sample of Well Jr173 are 122. 6 and 138. 4Ma, respectively. Zircon grains in Well Jr176 show weighted mean Pb-206/(238) U age of 122. 63 Ma, indicating that the volcanic rocks were formed in late stage of Early Cretacesous rather than Jurassic as previously believed. Based on the spatial variations of ages of the Mesozoic volcanic rocks and characteristics of basin, it is suggested that the formation and evolution in Beijing area are microcosm of basin-mountain pattern in eastern of China.
SN 1000-0569
EI 2095-8927
PD NOV
PY 2016
VL 32
IS 11
BP 3547
EP 3556
UT WOS:000388278500023
ER  

PT J
AU Zhai, MG
AF Zhai MingGuo
TI Korea geology and implication for northeastern Asian geotectonics: Preface
SO ACTA PETROLOGICA SINICA
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2913
EP 2914
UT WOS:000388277000001
ER  

PT J
AU Zhai, MG
AF Zhai MingGuo
TI Comparative study of geology in North China and Korean Peninsula: Research advances and key issues
SO ACTA PETROLOGICA SINICA
AB In terms of geological and tectonic evolution, the Korea Peninsula (KP) has long been thought to be strongly tied with the mainland of China, with the North China Craton (NCC) and KP collectively termed as the Sino-Korea Craton, although such correlation suffered from the absence of relevant geological information and data in North Korea. This paper introduces our study of comparative study of geology in North China and Korean Peninsula, including Precambrian basements, Paleozoic basins, orogenic belts and Mesozoic magmatism. Main summary and conclusions are as follows. (1) The KP comprises three major Precambrian massifs i.e., Rangrim, Gyeonggi, and Yongnam massifs. The Rangrim and Gyeonggi massifs are separated by the Imjingang Fold Belt, while the Gyeonggi and Yongnam massifs are separated by the Ogcheon Fold Belt; (2) The basements of the three massifs are correlated to the NCC; (3) Two main Paleozoic basins within the Rangnim massif and within the Gyeonggi and Yongnam massifs are the Phyongnam basin and Taebaeksan basin that have a similar Paleozoic tectono-stratigraphy to the NCC; (4) Although, at present, the nature and tectonic significance of the Imjingang and Ogcheon belts remain controversial, these two structural belts do not show characteristics and natures of collisional orogenic belt; (5) The eclogite-bearing Hongseong Complex (HSC) is located in the southwestern part of the Gyeonggi massif and has been separated from the Gyeonggi complex. The eclogitic rocks are commonly associated with serpentinites, and occur as lenses in granitic gneiss. An eclogite sample yielded a metamorphic age of similar to 230 Ma and another protolith age of similar to 880Ma. Its hosting granitic gneiss yielded an age of ca. 820Ma. All these age records indicate that the Sulu Belt extends to the KP. However, no evidence supports the HSC as a tectonic zone cuts across the KP. A crustal detachment-thrust model envisages that the collisional suture between the North China Block (NCB) and South China Block (SCB) was along the Western Marginal Fault Zone of the KP; (6) Mesozoic igneous rocks are widespread throughout the northern and southern parts of the KP. Triassic magmatism is related to Indosinian orogeny. Jurassic and Cretaceous igneous rocks are different from those in the NCC on ages and spatial-temporal distribution. Late Cretaceous volcanic rocks are located only in the Gyeongsang basin in the southeastern corner of KP. This paper also suggests several key and controversial academic issues that are worth to study in the future.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2915
EP 2932
UT WOS:000388277000002
ER  

PT J
AU Wu, FY
Li, QL
Yang, JH
Kim, JN
Han, RH
AF Wu FuYuan
Li QiuLi
Yang JongHyok
Kim JongNam
Han RyongHyon
TI Crustal growth and evolution of the Rangnim Massif, northern Korean Peninsula
SO ACTA PETROLOGICA SINICA
AB Rangnim Massif, located in northern part of the Korean Peninsula, has long been considered as a coherent unit of the Sino-Korean or North China craton. It has been accepted that this massif is the eastward continuation of the Liaonan (South Liaoning) Archean massif in the Liaodong Peninsular, and has the similar Archean basement exposed to the Anshan-Liaobei-Jinan (Longgang) massif to the north. Between the Rangnim and Longgang massifs, a well-known Paleoproterozoic Liaoji rock unit is developed, represented by the Liaohe Group in Liaoning Province and Ji' an and Laoling groups in Jilin Province. However, it is controversial in terms of the tectonic setting of this huge Paleoproterozoic belt, as being either a rift within an Archean continent or a collisional belt between two individual Archean massifs. In this paper, detrital zircons from sands of the Taedong, Chongchon, Songchon, Changjin, Huju, Houchang and Tongno rivers were collected for U-Pb and Hf isotopic analyses, in order to constrain the crustal growth and evolution of the Rangnim massif since all these rivers are originated and run through the massif. The results from 10 samples indicated that the Rangnim massif is mostly composed by 1800 similar to 1900Ma rocks, with little component of Archean material. Field investigation concluded that the Rangnim massif is mostly composed by granulite-facies metamorphosed supracrustal rocks and related granites. Therefore, it is proposed here that the Rangnim is not an Archean massif, but a Paleoproterozoic unit like that of the Liaoji belt. Considered that the analyzed zircons show an Hf isotopic model age similar to that of the whole-rock in the North China craton, indicating a crustal reworking process within the North China craton during the Paleoproterozoic, it is argued that the above Paleoproterozoic unit could be an orogenic belt along the southeastern margin of the North China craton, and we therefore name it as the Liaoning-Jilin-Korea (Liaojichao) Paleoproterozoic orogenic belt. The traditional point of view that the Rangnim is of Archean should be re-considered, and further works are pressingly needed.
RI
WU, Fu-Yuan  K-5354-2015 
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2933
EP +
UT WOS:000388277000003
ER  

PT J
AU Lei, Z
Zhang, YB
Yang, JH
Han, RY
Kim, JN
AF Zhao Lei
Zhang YanBin
Yang JongHyok
Han RyongYon
Kim JongNam
TI Archean rocks at the southeastern margin of the Rangnim massif, northern Korean Peninsula, and their response to Paleoproterozoic tectonothermal event
SO ACTA PETROLOGICA SINICA
AB Rangnim Massif in North Korea is an important constituent part of the Sino-Korea Craton and the study of its rock assemblages, geochronology and metamorphic and deformation features will greatly influence the thorough interpretation and understanding of the geological evolution of the North China Craton and the whole northeastern Asia continent. In this study, we present the U-Pb dating and trace element analysis results of zircons from three granitoid gneisses from the Rangnim Complex, at the southeastern margin of the Rangnim Massif. Three gneissic samples give protolith magmatic ages of 2521 similar to 2567Ma and they also record the Paleoproterozoic (1. 87 similar to 1. 89Ga) tectonothermal event as certified by the different extend of recrystallization of zircons and the accompanied Pb-loss, and also the formation of new metamorphic zircons. Based on the results of this study and a synthesis of other studies, we proposed that the scale of the Archean basement rocks of the Rangnim Massif might be much larger than the several locations identified from the south and the east margin of the Pyongnam Basin. All the identified Archean gneisses in the Rangnim massif experienced strong Paleoproterozoic metamorphic overprinting and anatexis with ages similar to those reported from the whole North China Craton. This similarity likely suggests that the Rangnim massif might have amalgamated with the NCC to form a coherent continent before this Paleoproterozoic episode of tectonothermal event.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2948
EP 2964
UT WOS:000388277000004
ER  

PT J
AU Zhang, XH
Wang, HZ
Park, H
Yang, J
Kim, J
AF Zhang XiaoHui
Wang HaoZheng
Park, HyoNuk
Yang, JongHyok
Kim, JongNam
TI Basement affinity of the Kwanmo Massif, Korean Peninsula : Evidence from zircon U-Pb geochronology and petro-geochemistry of the Undokdong meta-intrusive complex
SO ACTA PETROLOGICA SINICA
AB Recognizing and characterizing the basement affinity of terranes presents a critical task for establishing the link between the Korean Peninsula (KP) and the North China Craton (NCC) since Archean on. This study aims to bridge the gap in the characterization of the Precambrian basement rocks in the KP by documenting the Undokdong meta-intrusive complex in the Chongjin region, the Kwanmo Massif. SIMS zircon U-Pb dating on three representative samples from the complex yielded magmatic crystallization ages from 2. 53 to 2. 51Ga. In terms of their petrological and geochemical traits, the protoliths of these metamorphic rocks can be recognized as quartz diorite and potassic granite, and compare well with the classic magmatic charnockite suites in the world. Synthesizing these features with the variable zircon epsilon(Hf) (t) values from -1. 7 to + 10. 5 in the three samples, we infer that the Undokdong meta-intrusive complex might originate from the high-T and CO2-rich fluid-fluxed partial melting of basaltic lower crust and subsequent fractionation, thus representing typical products of magmatic arcs on an active continental margin. Given a possible tectonic link with a Neoarchean arc root, these rocks could present a spatial reference for defining the consistency in tectonic affinity between the Kwanmo Massif and the Helong/Qingyuan terrains in the eastern NCC, thus leading to the characterization of an Andean-type active continental margin across these terrains during Neoarchean.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2965
EP 2980
UT WOS:000388277000005
ER  

PT J
AU Liao, X
Zhang, XH
Kim, S
Park, U
Jong, C
AF Liao Xin
Zhang XiaoHui
Kim, SungHyon
Park, Ung
Jong, Cholsu
TI Detrital zircon U-Pb ages of the Machollyong Group in Korean Peninsula: Regional correlation and tectonic implications
SO ACTA PETROLOGICA SINICA
AB The meta-sedimentary successions in the intra-cratonic mobile belts encapsulate essential information for deciphering the convergent and divergent geodynamic processes of constituent terranes during the construction of early supercontinents. The detrital zircon geochronology presents a key to probing it. With a view to bridging the gap in the characterization of massive meta-sedimentary successions in the most representative Paleoproterozoic mobile belts (i. e., the Liao-Ji-Korea mobile belt) in the North China Craton, this study carried out a detrital zircon SIMS U-Pb dating on the Machollyong Group at Komdok, Korean Peninsula. Zircons from one meta-pyroclastic sample of the Puktaechon formation yielded a dominant peak age of ca. 2. 53Ga and a youngest peak age of ca. 2. 19Ga, constraining their formation time to later than 2. 2Ga. Detrital zircons from one meta-sedimentary sample of the Namdaechon formation yielded a dominant peak age span from 2. 02 to 2. 18Ga, a subordinate peak age of ca. 2. 46Ga and a few older ages from 2. 78 to 3. 30Ga, reflecting dual provenances of the Paleoproterozoic plutons in the Rangnim Massif and the Neoarchean and Mesoarchean crusts in the neighboring terranes. The youngest detrital age constrains the maximum deposition time of the Namdaechon formation at ca. 2. 02Ga. Regional comparison suggests that the Machollyong Group shows consistent detrital zircon age spectra with the Liaohe Group and Ji' an/Laoling groups in the Liao-Ji mobile belt. Such consistency indicates their synchronization in deposition and similarity in provenance. These coeval and consanguineous litho-stratigraphic sequences can provide insightful reference for calibrating the tectonic affinity in the Liao-Ji and Korea mobile belt during the Paleoproterozoic. The dominance of detrital zircons with ages close to the depositional age is characteristic of various basins on convergent plate margins, but inconsistent with rift basins commonly featuring much older detrital zircons than the depositional age.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2981
EP 2992
UT WOS:000388277000006
ER  

PT J
AU Peng, P
Wang, C
Yang, JH
Kim, JN
AF Peng Peng
Wang Chong
Yang JongHyok
Kim JongNam
TI A preliminary study on the rock series and tectonic environment of the similar to 1. 9Ga plutonic rocks in DPR Korea
SO ACTA PETROLOGICA SINICA
AB There are widespread similar to 1. 9Ga plutonic rocks in DPR Korea, which can be subdivided into three series, a porphyritic granite series (I-type granites, e. g., the Myohyangsan pluton, 1900 similar to 1840Ma), S-type granite series (e. g., the Gasan pluton, a 1862 +/- 5Ma zircon U-Pb age is obtained) and the syenite series (the Ryongpo pluton as an example, a 1857 +/- 2Ma zircon U-Pb age is obtained). The I-type granite series is called the Myohyangsan Complex by local geologists, and is characterized by megacrysts of K-feldspar and is closely occurred with the granulite facies meta-volcanics/sediments; whereas the S-type granite series is called the Ryonhwasan Complex, and is characterized by containing garnet and cordierite and is distributed in the high-grade paragneisses. This indicates that the S-type granites could be originated from paragneisses; while the porphyritic granite series (I-type granite) could be associated with the volcanic-containing supracrustal rocks. The syenite series is called as the Sakju Complex by local geologists, and is limitedly distributed in Sakju and Tokchong-Chongju and the neighbouring Liaodong Peninsula, and appears as stocks. These plutons are slightly older or basically coeval with the metamorphism timing of the regional amphibolite-granulite facies metamorphism (a 1844 +/- 2Ma zircon U-Pb age is obtained from paragneiss of the Jungsan 'Group'). The syenite series could be originated from high-pressure melting of crustal materials. There are also similar series of plutons in the neighboring Liaodong-Jinan and Jiaodong areas, where the similar to 2. 1Ga igneous rocks are more prominent. There are also widespread similar to 1. 9Ga plutons in southern Korean Peninsula; however, these are dominantly porphyritic granites with a few charnockite and anorthosite. It may indicate different basements for the north and south part of the peninsula, i. e., they may belong to different paleo-continents (North and South China blocks). The widespread 1. 9Ga I-type and S-type granites with locally syenites and some mantle-derived igneous rocks in northern Korean Peninsula are coeval with the regional high-grade metamorphism. Considering the existence of Archean basement, we suggest that the region was possibly similar to modern continent marginal arc at the Paleoproterozoic.
RI
Peng, Peng  B-5769-2011 
OI
Peng, Peng  0000-0002-6743-4669  
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 2993
EP 3018
UT WOS:000388277000007
ER  

PT J
AU Li, Q
Zhao, L
Zhang, YB
Yang, JH
Kim, JN
Han, RH
AF Li QiuLi
Zhao Lei
Zhang YanBin
Yang JongHyok
Kim JongNam
Han RyongHyon
TI Zircon-titanite-rutile U-Pb system from metamorphic rocks of Jungshan "Group" in Korea: Implications of tectono-thermal events from Paleoproterozoic to Mesozoic
SO ACTA PETROLOGICA SINICA
AB The Jungshan 'Group' (Complex) in the Korean Peninsula is mainly composed of garnet mica gneiss, garnet amphibolite and some marble. Its protolith rocks are pelite-dominated elastic rocks with a few volcanic and carbonates, which were metamorphosed to amphibolite to granulite facies. In this paper, we present our results on the U-Pb system of zircon, titanite and rutile from two pelitic gneissic samples and one garnet amphibolite sample from the Jungshan Group. Zircons form the two garnet mica gneissic samples are of typical metamorphic zircons with average age of 1850 +/- 5Ma. No zircon cores were identified from the zircons analyzed, indicating that zircons must have been scarce in the protolith of the pelitic gneiss. Two different groups of titanite grains can be identified from the garnet amphibolite based on their petrogenesis and they are the early stage and the late stage titanite grains. Early stage titanite grains were formed at amphibolite to granulite facies and they are characterized by high U contents and high Th/U ratios. Their U-Pb ages plot on a well-defined discordia whose upper intercept age is 1831 +/- 5Ma and lower intercept age is 155 +/- 3Ma. The former age represents the time at which the temperature of the rock reduced close to the closure temperature of titanite while the latter represents time of the Mesozoic tectonothermal event disturbance. The late stage titanite grains are characterized by low U contents and low Th/U ratios. These titanite grains give one age of 153 +/- 3Ma which also represents time of the Mesozoic tectonothermal disturbance. Rutile grains from the two different rocks preserved little early geochronological information while most of their U-Pb systems were reset at similar to 155 Ma. However, the U-Pb system of rutile was not closed until similar to 110Ma. The similar to 110Ma age is probably closely related to the widespread emplacement of similar to 110Ma granites in vicinity. The data indicate that the Jungshan Complex experienced high-grade metamorphosm prior to/close to similar to 1850Ma and exhumed since ca. 1850 similar to 1830Ma and thus became the provenance, as well as the basement of the Meso-Neoproterozoic strata. The Jungshan Complex also recorded the extensive igneous-thermal events during Meoszoic.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3019
EP 3032
UT WOS:000388277000008
ER  

PT J
AU Park, H
Zhai, MG
Yang, J
Kim, J
Jong, C
Wu, FY
Kim, S
Han, R
Park, U
Kim, M
Hou, QL
AF Park, HyoNuk
Zhai MingGuo
Yang, JongHyok
Kim, JongNam
Jong, CholSu
Wu FuYuan
Kim, SungHyon
Han, RyongYon
Park, Ung
Kim, MyongChol
Hou QuanLin
TI Meso-Proterozoic magmatism event in the Pyongnam Basin, Korean Peninsula
SO ACTA PETROLOGICA SINICA
AB Paleoproterozoic Hwanghae Group and granites were developed in Ongjin area, southwestern part of the Pyongnam Basin, Korean Peninsula. The granites intruded into the Hwanghae Group. We obtained zircon LA-ICP-MS U-Pb isotopic data of four samples from two felsic volcanic rocks from Hwanghae Group and two representative granitic intrusions to determine their formation ages. New zircon U-Pb ages indicate that the felsic volcanic rocks located in lower and upper layer of Hwanghae Group were erupted in 1235 +/- 5Ma and 1203 +/- 7Ma, respectively, which suggest that the deposition age of the Hwanghae Group was Mesoproterozoic, not the traditional thought of Paleoproterozoic. Two granite plutons, Ongjin and Hwangyuisan, emplaced at 1251Ma and 1246Ma, respectively. The magmatism time around 1251 similar to 1203 Ma obtained in this study demonstrates the development of Mesoproterozoic magmatism on the Korean Peninsula. It indicates that Hwanghae rift has concurrent evolution history with the Eastern Marginal Rift of North China Craton.
RI
WU, Fu-Yuan  K-5354-2015 
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3033
EP 3044
UT WOS:000388277000009
ER  

PT J
AU Zhao, L
Zhang, YB
Wu, FY
Li, QL
Yang, J
Kim, J
Choi, W
AF Zhao Lei
Zhang YanBin
Wu FuYuan
Li QiuLi
Yang, JongHyok
Kim, JongNam
Choi, WonJong
TI Paleoproterozoic high temperature metamorphism and anatexis in the northwestern Korean Peninsula: Constraints from petrology and zircon U-Pb geochronology
SO ACTA PETROLOGICA SINICA
AB The Korean Peninsula is juxtaposed by the North China Craton (NCC) to the left and the Japanese island chain to the right. Its position is of both geographical and geological importance and thus the study of its geological evolution and tectonic features will greatly stimulate the thorough understanding and interpretation of northeastern Asia geology. In this paper, we present the study results of rocks sampled from the Nampo and Jungsan groups located in the western Rangrim massif. Field as well as microscopic observations show that the studied samples from both the Nampo and Jungsan groups preserve macroscopic and microscopic evidence of anatexis, like the leucosome patches, melanosome, the thin-film structure between mineral boundaries. Mineral assemblages and reaction textures of the studied samples suggest that these rocks experienced anatexis, under both fluid present (?) and fluid absent conditions and the metamorphic grade is amphibolite to granulite facies. During later cooling and melt crystallization stage, back reaction and/or retrograde metamorphism occurred. Zircon U-Pb age results of the seven studied samples indicate episodic metamorphism and anatexis. Samples of the Nampo Group recorded an episode of metamorphism and fluid absent melting at 1917Ma and another at 1877 similar to 1855Ma. Melt cooling and crystallization probably occurred at 1842Ma. Samples of the Jungsan Group give the time of anatexis (fluid present?) and garnet growth at 1841 similar to 1830Ma and melt cooling and crystallization at 1785Ma. This study shows that the time of the Paleoproterozoic metamorphism and anatexis in the Rangrim massif is broadly similar to those in the NCC (although there might be some difference in the patterns of metamorphism and anatexis) which, in turn, might suggest that the NCC and the Rangrim massif might have evolved into a uniform continent before Paleoproterozoic.
RI
WU, Fu-Yuan  K-5354-2015 
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3045
EP 3069
UT WOS:000388277000010
ER  

PT J
AU Zhang, XH
Zhang, YB
Yuan, LL
Li, YS
Choi, WJ
Kim, H
AF Zhang XiaoHui
Zhang YanBin
Yuan LingLing
Li YongSik
Choi WonJong
Kim Hon
TI Late Permian mafic volcanic rocks in the Hambuk massif, Korean Peninsula: Geochemistry, origin and tectonic implications
SO ACTA PETROLOGICA SINICA
AB Constraining the Late-Paleozoic volcanism in the northern North Korea is critical not only for facilitating the tectonic division in the Korean Peninsula, but also for probing geodynamic process at the transitional stage of tectonic regimes in NE Asia. This geochronological and geochemical study documents the Late Permian mafic volcanic rocks from the Hambuk massif of North Korea. SIMS zircon U-Pb dating yields an eruption age at 257 +/- 3 Ma. These rocks exhibit moderate enrichment in large ion lithophile elements and light REE, slightly negative Eu anomalies, and clear depletion in high field strength elements (e.g., Nb, Ta, Ti). They show a range of zircon epsilon(Hf) (t) values from + 10 to + 16. These geochemical features suggest that their generation most likely involves a precursory metasomatism stage of mantle peridotites by melts from subduction-related sediments and an immediate partial melting stage. With a depleted mantle parentage and possible tectonic link to post-orogenic extensional regime, these rocks could present a spatial hallmark not only for monitoring the extension of the eastern Central Asian Orogenic belt (CAOB) into the Korean Peninsula, but also for tracing the final location of the cryptic suturing zone of the Paleo-Asian Ocean.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3070
EP 3082
UT WOS:000388277000011
ER  

PT J
AU Peng, P
Yang, SY
Wang, XP
AF Peng Peng
Yang ShuYan
Wang XinPing
TI A preliminary study on the distribution, magma series and petrogenesis of the Triassic igneous rocks in middle-southern Korean Peninsula
SO ACTA PETROLOGICA SINICA
AB There are many Triassic plutons in Korean Peninsula, mainly in the middle-southern, which constitutes a NE-trending corridor zone. Based on lithology, this corridor can be divided into two subzones along the Hongseong-Koseong line, the north subzone (syenite zone/alkaline rocks zone) covers the southern part of the Rangnim massif and the northern part of the Kimggi (Gyeonggi) massif and is composed of alkaline series, mainly syenites; while the southern sub-zone (monzonite zone) lies in the southern part of Kimggi massif and the Yongnam massif and is composed of subalkaline series, mainly monzonites, with some diorite to gabbro components, and a few A-type granites to the south. These plutons formed at ca. 230 similar to 220Ma, e.g., a 228.7 +/- 0. 8Ma U-Pb zircon concordia age is obtained for the Kangbuk biotite syenite from the north sub-zone. These Triassic plutons are coeval with the regional high-grade metamorphism and distribute in consistent but slightly bigger areas, which indicates a cogenetic relationship. These plutons are depleted in high field strengthen elements but enriched in light rare earth elements and large ion lithophile elements, a typical feature of continental lithosphere. Compared between the two subzones, the north sub-zone has systematically lower SiO2 and Na2O contents, but higher K2O, Sr, Ba, La, Eu, Y, Cr and rare earth elements and stronger fractionation between the light and heavy rare earth element (represented by higher (La/Yb) (N)). Spatially, the K2O/Na2O and SiO2 values changes oppositely, i.e., the K2O/Na2O increases while the SiO2 decreases from south to north in both sub-zones. However, the variations in K2O + Na2O and Sr/Y change in a similar trend, i.e., they both decrease from south to north in the south sub-zone and from north to south in the north sub zone. We think the boundary of the two sub-zones is close to the suture between the basements of the North and South China blocks, and the rocks were products of a syn-to post-collision process. And subduction of the South China block (southern Korean Peninsula) beneath the North China block (northern Korean Peninsula) can interpret the spatial variations in composition and lithology.
RI
Peng, Peng  B-5769-2011 
OI
Peng, Peng  0000-0002-6743-4669  
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3083
EP 3097
UT WOS:000388277000012
ER  

PT J
AU Zhang, YB
Wu, FY
Yang, JH
Kim, JN
Han, RH
AF Zhang YanBin
Wu FuYuan
Yang JongHyok
Kim JongNam
Han RyongHyon
TI Petrogenesis and geological implications of Phanerozoic granitoids at northern Korean Peninsula
SO ACTA PETROLOGICA SINICA
AB The Tumangang belt and Kwanmo massif, located in northern part of the Korean Peninsula, are characterized by large volumes of granitoids and traditionally regarded as of Late Permian and Early Triassic ages. We obtained zircon SIMS U-Pb isotopic data of 16 samples from six representative granitic intrusions to determine their intrusive ages. New zircon U-Pb ages indicate that the granites in this area can be subdivided into three episodes: Late Permian (265 similar to 263Ma), Early Triassic (248 similar to 240Ma) and Jurassic (199 similar to 173Ma). Mineralogical and geochemical features suggest that all granites are I-and high fractionated I-types and most rocks belong to high calc-alkaline. Zircons from Jurassic granites in the Tumangang Belt and Kwanmo Massif, Late Permian gneissic granites in the Kwanmo Massif, are characterized by positive epsilon(Hf) (t) values (4.7 similar to 13.5), fairly young t(DM2) (Hf) (367 similar to 784Ma) and uniform 0 isotopic composition (delta(18)0 : 5.7% similar to 7.4%c). Such Hf-O isotopic characteristics of these granitoids are likely indicative of a high proportion of juvenile material in their petrogenesis. The highest epsilon(Hf) (t) value (13.5) need a source of juvenile underplated basalt derived from depleted asthenospheric mantle. Zircons from Late Permian and Early Triassic granites in Kwanmo Massif normally have lower epsilon(Hf) (t) values (-10.9 similar to 3. 8), older t(DM2) (Hf) (889 similar to 1651 Ma) and large variation of 0 isotopic composition (delta(18)0 : 5.6% similar to 9.2%c), indicating that they were derived from anataxis of old crustal basement materials. Regional comparison shows that the Tumangang belt and Kwanmo massif have the same geological evolution history. The granites of these areas have a great similarity with the granites in Jihei orogenic belt in the geochronological framework, petrological and geochemical characteristics, genetic type and magma source region, which indicate that the Tumangang belt and Kwanmo massif belong to the Cental Asian Orogenic Belt. Our studies suggested that Late Permian and Early Triassic granitoids belong to syn-collisional granites in northern margin of the North China Craton, which were most likely related to subduction of the Paleo-Asian Oceanic Plate beneath the North China Craton. In the Jurassic, Northeast China and Korea Peninsula transfer to Round Pacific Ocean tectonic field. With the effect of subduction of the Pacific Ocean Plate, a large area of Jurassic granites were developed.
RI
WU, Fu-Yuan  K-5354-2015 
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3098
EP 3122
UT WOS:000388277000013
ER  

PT J
AU Kim, JN
Han, RY
Zhao, L
Li, QL
Kim, SS
AF Kim JongNam
Han RyongYon
Zhao Lei
Li QiuLi
Kim SokSan
TI Study on the petrographic and SIMS zircon U-Pb geochronological characteristics of the magmatic rocks associated with the Jongju and Cholsan REE deposits in northern Korean Peninsula
SO ACTA PETROLOGICA SINICA
AB Rangrim massif in the northern part of the Korean Peninsula is an importance constituent part of the Sino-Korea Craton. Its Early Precambrian rock associations, metamorphic and deformation characteristics are similar to those of the Liaonan terrane and the Liaoji Belt in North China Craton. Some REE deposits are distributed in the Jongju and Cholsan regions and they are closely related to alkaline rocks and porphyraceous granites outcropped in these regions. Coarse-grained syenite, fluoritized aegirine-augite syenite and porphyraceous granite samples were collected from these regions. Petrographic observation results show that the rocks don't show obvious alteration related to later hydrothermal fluids except those derived from the same episode of magmatism of the rocks. SIMS zircon dating results give magmatic ages for the weathered (coarse-grained) syenite of 1865 +/- 6 Ma, for the fluoritized aegirine-augite syenite of 1868 +/- 8 Ma and for the four porphyraceous granite samples of 1871 +/- 13 Ma, 1866 +/- 8 Ma, 1872 +/- 6 Ma and 1873 +/- 7 Ma, respectively. Synchronous magmatism and high grade metamorphism are widely distributed along the three Paleoproterozoic mobile belts in the North China Craton and similar alkaline rocks have also been reported from the Liaonan terrane. These lines of evidence suggest that the Liaonan terrane, the Liaoji mobile belt and the Rangrim terrane probably represent different parts of a single huge tectonic belt during Paleoproterozoic and this tectonic belt (or part of this belt) is in an extensional environment. After a thorough synthesis of the results from field and petrographic observations and zircon U-Pb dating, and based on a simple comparison, it can be seen that the REE deposits in the Jongju and Cholsan regions are different from the world class Bayan Obo REE deposit in many different ways, like the rock assemblage, the REE minerals, the alteration features of rocks and the time of REE metallogenesis. More work will be needed s in order to fully understand the REE mineral assemblages and the metallogenesis of these deposits.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3123
EP 3138
UT WOS:000388277000014
ER  

PT J
AU Li, Z
Ni, LM
Xu, JQ
AF Li Zhong
Ni LingMei
Xu JianQiang
TI The Upper Proterozoic-Paleozoic records of sedimentary sequences and detrital zircon geochronology in Korean Peninsula and North China: Implications for tectonic attributes and division
SO ACTA PETROLOGICA SINICA
AB Based on genetic analysis and correlation of stratigraphic frameworks, depositional sequences and detrital zircon chronological records, the paper further explored the Neoproterozoic-Paleozoic tectonic attributes and evolutional informations of Sino-Korean blocks. For the Pyeongnam and Tabeaksan basins, Korean Peninsula, and interior of North China block, their stratigraphic frameworks and depositional sequences are mainly characterized by the Cambrian-Ordovician inner continental shelf carbonate deposition, Silurian-Devonian non-deposition and middle-upper Carboniferous-Permian littoral coal-bearing deposition, in which the comparable age peaks of detrital zircons, including 1.85 Ga, 2.5 Ga, 1.15 Ga and 1.6 Ga, occur in the most sandstone samples of the Neoproterozoic-Paleozoic strata. However, for the Imjingang and Okcheon belts, Korean Peninsula, and southeast margin of North China block, their stratigraphic units are mainly composed by the Devonian-Carboniferous mudstones/schists, intermediate basic volcanics and pyroclastic rocks, generally characterized by depositional environments of outer continental shelf, with the comparably minimum age peaks close to the stratigraphic time ranges, also reflecting strong tectonic-magmatic activities during sedimentary stages. Therefore, it is presented that Korean Peninsula and North China are both belong to the first-order tectonic unit, that is, Sino-Korean Plate. However, due to southwestern Korean Peninsula and southeastern North China near to the plate margin, unstable/active tectonic regions, their stratigraphic-depositional records are obviously different those in the plate interior, indicating no identical stratigraphic-depositional model between them.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3139
EP 3154
UT WOS:000388277000015
ER  

PT J
AU Yang, JH
Peng, P
Jong, CS
Park, U
Mun, JG
Kin, CH
Ku, HC
AF Yang JongHyok
Peng Peng
Jong CholSu
Park Ung
Mun JongGun
Kin CholHyon
Ku HyonChol
TI Comparison on ages of detrital zircons from the Paleoproterozoic to Lower Paleozoic sedimentary rocks in the Pyongnam Basin, Korea
SO ACTA PETROLOGICA SINICA
AB The Pyongnam Basin of the Sino-Korean paleocontinent (the North China paleocontinent) is about similar to 25000 km(2) and lies in Middle Korean Peninsula, with the low-grade metamorphosed (up to greenschist facies) Mesoproterozoic to Lower Paleozoic strata. There are also the Paleoproterozoic high-grade (amphibolite to granulite facies) strata in the basement. This paper reports LA-ICP MS U-Pb ages of detrital/metamorphic zircons to constrain the provenances of different strata, with implications for the regional evolution. The Jungsan Group/Complex belongs to the basement of the basin. The meta-sandstone shows distinct ca. 2500 similar to 2100 Ma ages, and the similar to 3650 Ma age was the oldest age known so far in Korean Peninsula. The sillimanite-garnet-bearing gneiss shows a prominent similar to 1850 Ma age peak (1859 +/- 9 Ma), which likely represents the age of metamorphism. It is thus suggested that the Jungsan Group was formed at 2100 similar to 1900 Ma and metamorphosed at similar to 1850 Ma. The Hwanghae Group distributes only in the center of Korean Peninsula, detrital zircons show significant similar to 1850 Ma age peak, with minor similar to 1250 Ma ages, and their provenance could be the Late Paleoproterozoic igneous and metamorphic rocks. Considering the deposition age of the Jikhyon Group, the Hwanghae Group was possibly deposited at 1250 similar to 1000 Ma. The Jikhyon Group is widely distributed in the basin. Ages of detrital zircons from the first formation, the Jangbong Fm., show a distinct similar to 1850 Ma peak, but there are only ca. 1000 similar to 1200 Ma and ca. 1400 similar to 1600 Ma peaks with few ages > 1800 Ma in the samples from the second and third groups, this indicates that the initial provenance of this group was the Paleoproterozoic basement, but then changed to the Mesoproterozoic rocks. It is further concluded that the deposition age of the Jikhyon Group is ca. 1000 similar to 900 Ma. The Hwangju Group has two age peaks, i.e., the similar to 1850 Ma and the similar to 2500 Ma, with minor ca. 1000 similar to 1200 Ma and 1400 similar to 1600 Ma ages, this indicate that the provenance is the Late Archean-Paleoproterozoic basement with some redeposited materials possibly from the Mesoproterozoic sediments (e.g., Jikhyon Group and/or Hwanghae Group). These age spectrums of the Pyongnam Basin are quite similar to those coeval sediments in the Liaodong and Shandong peninsulas, and the Mesoproterozoic-Neoproterozoic strata show distinguish ca. 1000 similar to 1200 Ma and ca. 1400 similar to 1600 Ma provenances. These rocks might be from other block(s) such as the Sao Francisco craton other than the North China continent itself.
RI
Peng, Peng  B-5769-2011 
OI
Peng, Peng  0000-0002-6743-4669  
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3155
EP 3179
UT WOS:000388277000016
ER  

PT J
AU Kim, MC
Yang, JH
Peng, P
Zhai, MG
Pak, HU
Feng, LJ
Ri, CG
Ju, SH
AF Kim MyongChol
Yang JongHyoki
Peng Peng
Zhai MingGuo
Pak HyonUki
Feng LianJun
Ri ChungIl
Ju SongHyok
TI Characteristics of carbon isotope of the Ediacaran and Lower Cambrian strata in the Pyongnam basin, DPR Korea
SO ACTA PETROLOGICA SINICA
AB The Pyongnam basin of the Sino-Korean block (North China block) lies in Middle Korean Peninsula and contains extensive Neoproterozoic to Early Paleozoic strata. Based on fossils, it is generally accepted that the Yontan Group (Pirangdong and Rungri Fms. from bottom up) belongs to the Ediacaran while the Pyongsan and Junghwa Fms. of the Hwangju (Super-) group belong to the Lower Cambrian. However it is yet unclear whether the Yontan Group records glaciation (e.g., the Gaskiers glaciations) and where is the boundary between the Neoproterozoic and the Early Paleozoic. Carbon and oxygen isotope study show that the delta C-13 values start from + 2 parts per thousand at the bottom, vary between + 2 parts per thousand similar to +6 parts per thousand, and finally back to +2 parts per thousand in the Pirangdong Fm., from 0 to -7%o in the Rungri Fm., between -3.1 parts per thousand and 0 parts per thousand in the Pyongsan Fm., and from -1.2 parts per thousand to + 1.9 parts per thousand in the Junghwa Fm. The data negate the previous thought that there is tillite in the Pirangdong Fm., which recorded the Gaskiers period. The negative drifting in the Rungri Fm. cannot match those during the Gaskiers or Marinoan period glaciation but is possibly corresponding to the drifting at the end of the Ediacaran. Based on a comparison of the carbon isotope variations with the global trend, it verifies that the Yontan Group and the Pyongsan and Junghwa Fms. of the Hwangju Group deposit during the Late Ediacaran-Early Cambrian. As there is no clear unconformtiy, the two groups can be regarded as a continuous section of the Late Ediacaran-Early Cambrian, and we propose that the phosphorous and sulphide-bearing black slate in the bottom of the Pyongsan Fm. of the Hwangju Group could be the boundary layer.
RI
Peng, Peng  B-5769-2011 
OI
Peng, Peng  0000-0002-6743-4669  
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3180
EP 3186
UT WOS:000388277000017
ER  

PT J
AU Wu, YD
Hou, QL
AF Wu YuDong
Hou QuanLin
TI The extension of the Dabie-Sulu orogenic belt in Korean Peninsula: Based on Ar-40/Ar-39 Tectonic chronology
SO ACTA PETROLOGICA SINICA
AB In this study, Ar-40/(39) dating was done on 14 biotites or hornblende mineral separated from mylonites and gneiss in shear belts from different tectonic position of Korean Peninsula. Depending on the deformation characteristics of geological sections and associative tectonic chronology data, comparison was made between Korean Peninsula (include Rimjingang Belt and Okchon Belt) and Dabie-Sulu orogenic belt, and the eastward extension of Dabie-Sulu orogenic belt was discussed. As a result, Rimjingang belt of Korean Peninsula is similar to Beihuaiyang tectonic belt of North Dabie orogenic belt and north of Sulu belt in deformation characteristics and era, and Okchon belt is similar to South Dabie belt in the same ways. Furthermore, three main Mesozoic tectonic event of Korean Peninsula could be recognized such as: Collide Stage (T-1, similar to 210 Ma), Orogenesis Stage (T-2-J(3) 200 similar to 150Ma), Extensional Stage (K1-2, 140 similar to 90 Ma). On these bases, the geologic body between Rimjingang belt and Okchon belt is a holonomic Mesozoic orogene, as the eastern extending part of Dabie-Sulu orogenic belt, and "Gyonggi Massif" should be redefined as a part of the orogenic belt.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3187
EP 3204
UT WOS:000388277000018
ER  

PT J
AU Qin, HF
Pan, YX
He, HY
Yang, LK
Zhu, RX
AF Qin HuaFeng
Pan YongXin
He HuaiYu
Yang LieKun
Zhu RiXiang
TI Paleomagnetism of Early Cretaceous volcanic rocks at Huangya section in Jiaodong Peninsula and implications for tectonics
SO ACTA PETROLOGICA SINICA
AB Rock magnetism and paleomagnetism study was conducted on 42 volcanic rock samples collected from 3 sites at Huangya section in Jiaodong Peninsula, Shandong Province in eastern China. Stepwise thermal demagnetization on 40 samples yielded stable characteristic remanent magnetization (ChRM) directions. Their overall average direction is D/I = 12.8 degrees/62.4 degrees (alpha(95) = 4.8 degrees) with a corresponding average virtual geomagnetic pole (VGP) at 76.7 degrees N and 162.6 degrees E (A(95) = 6.2 degrees). The Ar-40/Ar-39 age of HY3 is about between 115.3 +/- 1. 3Ma and 115.6 +/- 1. 6Ma (2 sigma). It indicates that the sampling area has no significant rotation and displacement relative to the North China Block (NCB) in the Early Cretaceous. When comparing to available paleomagnetic data of Late Mesozoic we found that Shandong and Liaoning regions from Late Jurassic to the end of Cretaceous shows similar pattern of declination variation with time. It suggests that that the tectonic activity in eastern NCB was likely affected by the subduction process of paleo-Pacific plate during Cretaceous time.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3205
EP 3213
UT WOS:000388277000019
ER  

PT J
AU Park, SC
Kim, TU
Cho, IW
Kim, SC
Kim, IC
AF Park SongChol
Kim TongUk
Cho Ilwon
Kim SuChol
Kim InChol
TI Scoriae magma evolution at Paekdu volcano, Democratic People' s Republic of Korea
SO ACTA PETROLOGICA SINICA
AB Scorias are one of the major products of Paekdu (or Changbai) volcano, widespread distributed along numbers of scoria cones in Democratic People' s Republic of Korea. In the field, these rocks mainly appear as the unconsolidated porous pyroclastic, and the colour of pyroclastic deposits chang from red or red -brown at the surface to brown or grey to depth. In this study, we report an integrated dataset of major and trace elements for the scoriaes, and propose that scoriaes resulted from assimilation and fractional crystallization process of the mafic primitive basalt magmas. These volcanic rocks consist of basalt, trachybasalt, basaltic trachyandesite and trachyandesite, which are characterized by high Na2O + K2O (5.46% similar to 9.30%), SiO2 (46.22% similar to 55. 38%) and Al2O3 (15.28% similar to 22.11%), and relatively low MgO (2.05% similar to 4.94%) and FeOT (6.79% similar to 14.76%). Chondrite-normalized rare earth elements (REE) patterns display positive Eu anomalies. Primitive mantle -normalized incompatible trace elements diagrams exhibit strong enrichment in large ion lithophile elements (LILE) relative to highfield strength elements (HFSE) and display significantly negative Nb-Ti anomalies. Besides, differentiation index (DI) of the studied volcanic rocks ranges from 36. 93 to 64. 48, higher than those formed during craton - forming period; Their consolidation index (SI) ranges from 10. 73 to 24. 09, lower than those derived from early mantle basalts (SI = 25 similar to 45). These chemical characteristics indicate that the Paekdu volcanic rocks experienced high degree fractionation. Also, values of Nb/La, Sm/Nd, La/Nb and Ba/Nb ratios all scatter between the values of mantle basalts and continental crust, which imply obvious crustal contamination. We thus propose that the scoria of the study area might have formed through fractionation and crustal contamination during the ascending of basaltic magma from mantle.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3214
EP 3224
UT WOS:000388277000020
ER  

PT J
AU Fan, HR
Feng, K
Li, XH
Hu, FF
Yang, KF
AF Fan HongRui
Feng Kai
Li XingHui
Hu FangFang
Yang KuiFeng
TI Mesozoic gold mineralization in the Jiaodong and Korean peninsulas
SO ACTA PETROLOGICA SINICA
AB Eastern North China Craton (NCC) is connected with Korean Peninsula, constituting an important part of Sino-Korea Craton. Different scales of gold deposits with significant regional characteristics have been found in the Jiaodong Peninsula of NCC and Korean Peninsula. More than 200 gold deposits/spots within Jiaodong Peninsula, including world-class Sanshandao, Jiaojia, Xincheng and Linglong gold mines, have been explored. Two types of gold deposits at Jiaodong are widely accepted, namely quartz vein-style and structurally controlled altered rock-style. Geochronology demonstrated that these gold mineralizations were happened in a short time interval around 120Ma. All gold deposits were formed at the same tectono-magma-fluid geodynamic background. Auriferous fluids were come from mantle-derived magma or interaction between mantle-derived magma and crust. Gold mineralization took place in the extensional tectonic settings at crust/lithosphere in the Early Cretaceous. The deposits at Jiaodong were called decratonization gold deposits. Pyonganbuk in the North Korean, adjoining Liaodong, hosts several tens gold deposits and gold resource are huge. Gold occurrence and mineralization type are similar to Wulong gold deposit in the neighbour Liaodong. This quartz vein type gold mineralization might be also connected with lithospheric thinning and craton destruction of NCC at Early Cretaceous. The gold-silver deposits in South Korea can be classified into Jurassic mesothermal and Cretaceous epithermal styles of mineralization. Gold occurrence of Jurassic lode mineralization in South Korea is similar to that at Jiaodong with remarkable discrepancy of mineralizing peak around 160Ma. The Cretaceous gold-silver deposits in South Korea were mainly formed at 100 70Ma, and associated with the subduction of the Pacific plate. The deposits are belonged to typical epithermal base metal metallogenic series related to hydrothermal systems around porphyry and sub-volcanic activity. Similarities and differences among type, occurrence and mineralizing time of gold deposits in the Jiaodong and Korea peninsulas are closely related with Mesozoic geological evolution and geodynamic setting.
SN 1000-0569
EI 2095-8927
PD OCT
PY 2016
VL 32
IS 10
BP 3225
EP 3238
UT WOS:000388277000021
ER  

EF  

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主办单位:中国矿物岩石地球化学学会
印刷版(Print): ISSN 1000-0569 网络版(Online): ISSN 2095-8927
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