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注释: Web of Science™ ============================================================

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VR 1.0
 

PT J
AU Qin, KZ
Zhai, MG
Li, GM
Zhao, JX
Zeng, QD
Gao, J
Xiao, WJ
Li, JL
Sun, S
AF Qin KeZhang
Zhai MingGuo
Li GuangMing
Zhao JunXing
Zeng QingDong
Gao Jun
Xiao WenJiao
Li Jiliang
Sun Shu
TI Links of collage orogeonesis multiblocks and crust evolution to charateristic metallogenese in China
SO ACTA PETROLOGICA SINICA
AB The style, spatial-temporal distribution, formation and evolution of mineral resources are closely related to the nature and evolution of the crust and the development of the tectonic framework. Due to the complexity of geological settings in Chinese continent, various types of metallogenic systematics are well developed, such as Proterozoic rift, collision, plume, low-temperature metallogenic systematics. China is rich in Mo, W, Sn and REE but short of Cu, high-grade Fe, Al and sylvite. It also lacks of Early Precambrian mineral deposits, and has the outbreak of Yanshanian mineralization. The relationship between these characteristics of mineralization, the formation and evolution features of small continental blocks in China, and accretionary collage of microcontinents is still unclear. In this paper, we try to summarize and reveal the formation and evolution features of small continental blocks in China, the double-directions accretionary collage orogenesis in Central Asian Orogenic Belt (CAOB), and the evolution of Proto-Paleo-New Tethyan Ocean and succeden continent-arc collision orogenic belt as well as decraton of North China Craton (NCC) during Late Mesozoic, and their relationship to mineralizations. The features are as follows:(1) The mass ratio of platform over orogens in Chinese continent (about 3:7) is smaller than that of the bulk Earth (about 7:3). And China has the separated and small areas of Archean crust. The consolidation of the Chinese continental crust also took place over 500 similar to 1000Myr later than the shield areas elsewhere in the world. All these features resulted in the lack of rich BIF deposits, Archean giant VMS Cu-Zn deposits and Proterozoic rift-related Zambia-style giant Cu deposits. (2) We conclude the characteristics of the metallogenesis and their connection with the styles, evolution and overlapping of orogens along the North China, Tarim and Yangtze platforms and crustal evolution. The continental crust of China was formed through the accretion of several blocks. With the old masifs as the core and the orogen system of different ages as the margins, it progressively accreted and grew outwards, leading to the migration of volcanic intrusive activies, sites of sedimentation and related mineralization towards the margins of the old orogen and basin with the progress of time. (3) The Central Asian Orogenic Belt has experienced the Paleozoic accretionary collage of microcontinents, and Mesozoic-Cenozoic intra-continental orogenesis and basin-and-mountain system, thus the CAOB can host arc-related mineral deposits (e.g. ophiolite chromite deposit, porphyry Cu-Au-Mo deposit and volcanic-host massive sulfide deposit), collision-related ore deposits (e.g. orogenic gold deposit, and asbestos, talc and mica deposits), ore deposits related to unusual overlapping CAOB by Early Permian Tarim plume (magmatic Cu-Ni-Co deposit), and intra-continent extensional environment (such as, porphyry Mo deposit, hydrothermal Au deposit and pegamatite rare metals, sandstone U and sylvite deposits). (4) Numerous large- and super-large porphyry Cu-Au-Mo deposits, MVT Pb-Zn and ophiolite Cr deposits are generated in the evolution of Proto-Paleo-New Tethyan oceanic subduction along the Qilian, Kunlen to Bangongcuo-Nujiang and Yarlung Zangbo sutures and the process of the India-Asia continental collision in the Qinghai-Tibetan orogen. (5) Crustal movements in China, especially in East China, were ubiquitious, frenquent and rather strong, and these chacteristics are rarely seen in other parts of the world.
The massive magmatism and Au, Cu, Mo and light rare earth elements deposits around the NCC occurred in the Late Mesozoic, accompanied with the significant change in the nature of NCC and the decraton of North China lithosphere. A large number of world-class W, Sn and Mo deposits occured with high-evolved granitoids in the highly mature East China continent, related to the polycyclic nature of the tectonism, magmatism, and sedimentation in China. As all the metallogenic features are genetically associated with the evolution of continental crust and multi-stage orogens, the exploration plans in China shoud pay much more attention to the evolution features of small continental blocks, and accretionary collage of microcontinents. Finally, we suggest several significant questions in the areas of continental metallogeny and the futher exploration in China.
RI
Qin, Kezhang  B-6616-2012 
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 305
EP 325
UT WOS:000397326900001
ER  

PT J
AU Liang, GH
AF Liang GuangHe
TI Preliminary study of the relationship between cryptoexplosion and ore-forming process from Wnchuan earthquake
SO ACTA PETROLOGICA SINICA
AB At present there are still a lot of controversy about the genetic mechanism of earthquake, in this paper, at first we analysis many materials include trench, drilling, well logging and geophysical prospecting data, all results show that Wenchuan earthquake is a kind of cryptoexplosion process developed gradually from southwest to northeast. By further comparing the results of abroad earthquake study, we speculate that the explosive power of earthquake mechanism includes two aspects, one is the expansion of fluid phase change that cause underground explosion, the other is discharge (lightning) with leakage of the underground accumulated negative charges. Then through comparing the metallogenic mechanism of porphyry deposit, we learn that earthquake is a releasing process of pressure and temperature, which can meet the basic needs about elements change for porphyry deposit such as pressure, temperature and PH value. Wuchuan earthquake enriched phosphorus, sulfur, iron, manganese and other elements. At last we come to a conclusion that earthquake is a kind of underground concealed explosion process and metallogenic process fired by fault movement.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 326
EP 338
UT WOS:000397326900002
ER  

PT J
AU Tang, DM
Qin, KZ
Xue, SC
Mao, YJ
Tian, Y
Liu, YS
Mao, Q
AF Tang DongMei
Qin KeZhang
Xue ShengChao
Mao YaJing
Tian Ye
Liu YongSheng
Mao Qian
TI Nature of primitive magmas of Early Permian basalts in Tuha basin, Xinjiang: Constraints from melt inclusions
SO ACTA PETROLOGICA SINICA
AB The Permian basalts in the eastern Tianshan, NE Xinjiang, mostly distribute along the ENE fault in this area. The Ar-Ar age of the basalts in the Tuha basin is 298Ma. This confirms that the Tuha basalt is coeval with former basalts and sulfide-bearing mafic-ultramafic intrusion in the Tianshan region. The Tuha basalts have similar compositional features to island arc tholeiites and continental arc basalts, LREE enrichment and negative Nb and Ta anomaly, and are probably related with mantle metasomatized by subduction slab. The Tuha basalts have fresh olivine and plagioclase phenocrysts and in olivine phenocrysts which occurred many melt inclusions (MI). The opaque material in the melt inclusion are magnetite, suggest high Fe and oxygen fugacity when the formation of melt inclusions. The contents of melt inclusions show two types of high and low MgO. Furthermore, MI with high MgO content has low SiO2, trace elements and REE abundance; maybe indicate the characteristics of high partial melting and low degree evolution of mantle. The high MgO melt show depleted of Nb and Ta and the N-MORB type trace element and REE normalized patterns, reveal the melt had been metasomatized by subducted slab-derived fluid or melt. The low Th and Ta abundances, weaker Nb and Ta negative anomaly of MI, relative to Tuha basalts, implied the weaker metasomatism and less segregation. The Cu contents (12.4x10(-6)similar to 299x10(-6)) of the melt inclusions are similar with the basaltic magma, while the Ni contents (236x10(--6)similar to 697x10(-6)) of them are higher than the high Mg komatiitic and oceanic ridge basalts. A small number of sulfide segregation in deeper and more depleted of Cu than Ni due to higher partition coefficient of Cu can explain the decoupling of Cu and Ni content in the melt. Ni contents in parental magma are relatively higher than Cu may be the key factor which controls the total Ni/Cu ratios of sulfide ores is greater than 1.0 in Eastern Tianshan mafic-ultramafic intrusion related magmatic sulfide deposits.
RI
Qin, Kezhang  B-6616-2012 
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 339
EP 353
UT WOS:000397326900003
ER  

PT J
AU Chen, H
Ni, P
Chen, RY
Ye, TZ
Lu, ZC
Pang, ZS
Geng, L
Jia, RY
AF Chen Hui
Ni Pei
Chen RenYi
Ye TianZhu
Lu ZhiCheng
Pang ZhenShan
Geng Lin
Jia RuYa
TI Ore-forming fluids, sources of materials in the Jiande copper deposit, Zhejiang Province, China and implications for ore genesis
SO ACTA PETROLOGICA SINICA
AB The Jiande copper deposit is located in the northeast part of Qinzhou-Hangzhou suture belt between Yangtze and Cathaysia blocks, and it is one of the largest copper deposits in Zhejiang Province, China. The genesis of the Jiande copper deposit is still hotly debated. The aim of this paper is to present new field observations, fluid inclusions, H-O-S isotope data to constrain the metallogenic mechanism and ore genesis of the Jiande copper deposit. Based on petrographic observations of ore-bearing quartz collected from the massive ores, primary inclusions of the Jiande deposit have three types:two-phase liquid-rich (type III), two-phase vapor-rich (type III), and halite-bearing (type III) fluid inclusions. Type II inclusions occur widely in the Jiande deposit, and show homogenization temperatures of 280 similar to 340 degrees and salinities of 0.63%similar to 8.00% NaCleqv. Type II and type III inclusions primarily coexist in the ore veins. Homogenization temperatures of type ? and type II reveal peaks at 296 similar to 334 degrees and 290 similar to 326 degrees respectively, and their salinities at 1.22%similar to 2.00% NaCleqv and 31.87%similar to 38.16% NaCleqv, respectively. It indicates that fluid boiling process took place, and metal precipitation probably induced by extensive fluid boiling events during the ore stage. Hydrogen and Oxygen isotopic compositions are also within the range of magmatic water. delta S-34 of sulfides show positive values within a narrow range, close to zero in average, which points to a magmatic source. Based on geological observations, fluid inclusions, and H-O-S isotope data, the Jiande copper deposit is interpreted as a magmatic-hydrothermal deposit which is determined by "Calcium-Silicon Interface".
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 354
EP 366
UT WOS:000397326900004
ER  

PT J
AU Long, LL
Wang, JB
Wang, YW
Fang, TH
Mao, QG
Gao, YH
Zhao, LT
Gao, LM
AF Long LingLi
Wang JingBin
Wang YuWang
Fang TongHui
Mao QiGui
Gao YiHan
Zhao LuTong
Gao LiMing
TI Zircon U-Pb geochronological, geochemical characteristics and potential mineralization significance of the rhyolite in Kalatage copper polymetallic ore cluster area, eastern Tianshan
SO ACTA PETROLOGICA SINICA
AB Kalatage ore cluster area is located in Dananhu island arc belt on southern margin of Tuha Basin, eastern Tianshan, and pyritized rhyolite was generally developed in cluster area. This type of rock is composed of rhyolite, a small amount rhyrolitic volcanic breccia lavas and dacite. They are all metaluminous and calc-alkaline series, characterized by high silica (SiO2=69.51%similar to 95.81%); the total REE content of them is relatively low (Sigma REE=9.53x10(-6)similar to 86.40x10(-6)), REE fractionation is weak ((La/Yb)(N)=0.41 similar to 29.4), together with negative Eu anomaly (delta Eu=0.29 similar to 1.91), and their REE distribution patterns are of the right-inclined type with LREE slightly enriched; they are slightly enriched large-ion lithophile element Rb, Ba, K and obviously depleted Nb, Ta, Sr, P, Ti, showing the geochemical characteristics of island arc magmatic rocks. The positive epsilon(Nd)(t) values (+2.98 similar to+10.61) and a wide range of initial Sr-87/Sr-86 values (0.703053 similar to 0.712568) of the rhyolites were proposed that its original magma came from the mantle and mixed with crustal material. The SHRIMP zircon U-Pb ages of 439.9 +/- 4.8Ma for the rhyrolitic volcanic breccia lava and 439 +/- 7Ma for the rhyolite were obtained. Comprehensive research on the chronological, geological and geochemical characteristics of the rhyolites, shows that they are the volcanic and sub-volcanic rock formed by the subduction of Paleo-Asian ocean northwards beneath the Junngar plate in Early Silurian. The pyritization rhyolite has the genetic relationship with the deposits of Kalatage ore cluster area, especially with the Hongshi-Meiling epithermal deposit, and the cogenetic rhyolitic pluton may be the ore-forming geological bodies of Hongshi-Meiling vein-type deposits. They're one of the important prospecting indicators of Kalatage ore cluster area, and has certain universality.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 367
EP 384
UT WOS:000397326900005
ER  

PT J
AU Wang, BY
Jing, DL
Jiang, CY
Zhang, B
Wang, ZX
Shi, FP
AF Wang BangYao
Jing DeLong
Jiang ChangYi
Zhang Bo
Wang ZiXi
Shi FuPin
TI Geological background and metallogenetic mechanism of the eastern Awulale volcanic-hosted iron metallogenic belt in the western Tianshan
SO ACTA PETROLOGICA SINICA
AB Several iron oxide deposits are exposed along the eastern Awulale volcanic-hosted iron metallogenic belt, such as Beizhan, Dunde, Zhibo and Chagangnuoer iron deposit. These deposits are hosted in volcanic rocks of Dahalajunshan Formation. The rocks that range from basic to acid rock are widely distributed in every iron deposit, and all kinds of rocks have different proportion in very iron deposit. Rock chemical series mainly consist of shoshonite, high-K calc-alkaline and calc-alkaline series, with a small amount of tholeiite series. They are enriched in LREE and LILE with obvious depletions of Nb, Ta and Ti. It suggests that they have a blood relation with arc or volcanic-arc rocks. In this paper, we suggest that these deposits are a polygenetic magmatic deposit and volcanic hydrothermal deposit related to the magmatic-hydrothermal system. Metallization types include oxide liquation metallization, cryptoexplosive-injection mineralization, fractional crystallization mineralization with magma flow and hydrothermal metasomatic mineralization. Mineralized factors and metallogenic conditions include:(1) Active continental volcanic rock combination and borderline tectonic setting. (2) Basic and neutral volcanic magma eruption and in the part of the basic volcanic rocks. (3) The intensive differentiation evolution of primary ore magma resulted in oxide liquation metallization. It is the key mechanism for the formation of the rich ore body in central portion that fractional crystallization and magma flow. (4) Magmatic hydrothermal has been circulating in the convection. As hydrothermal fluid altered with the wall rocks, Fe is extracted into the fluid. This is the basic mechanism for the formation of hydrothermal ore. (5) Volcanic edifice and associated fractures are good space for ore magma activity, and they provided the physical and chemical conditions for mineralization and enrichment. They are main ore controlling factors and parts where ore body occurred in. Iron deposits are closely related to volcanism, the magma and hydrothermal activity repeatedly lead to multiple stages of mineralization.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 385
EP 397
UT WOS:000397326900006
ER  

PT J
AU Pang, XY
Qin, KZ
Wang, L
Song, GX
Li, GM
Su, SQ
Zhao, C
AF Pang XuYong
Qin KeZhang
Wang Le
Song GuoXue
Li GuangMing
Su ShiQiang
Zhao Chao
TI Deformation characteristics of the Tongshan fault within Tongshan porphyry copper deposit, Heilongjiang Province, and restoration of alteration zones and orebodies
SO ACTA PETROLOGICA SINICA
AB The Tongshan copper deposit is situated in the Duobaoshan copper ore field, Heilongjiang Province. It and Duobaoshan porphyry copper deposit are the oldest (Ordovician) porphyry copper deposits within the eastern part of the Central Asian Orogenic Belt. The Tongshan fault, the most important post-mineralization fault in the Tongshan copper deposit, cuts orebodies and alteration zones, which leads to mineralized center unknown and direction for further prospecting unclear. Its current kinematic characteristics is still under controversial, moreover, detailed reporting involving deformation feature descriptions is lacking. This paper carried out both detailed indoor and outdoor studies, and several understandings were accomplished:1) The Tongshan fault, with a nearly EW strike, belongs to a compression-shear fault. Its most typical geometric feature is the development of NEE-strike cleavages, structural lenses and twisted dykes and hydrothermal veins. 2) Microscopic deformation features of quartz, pyrite, chalcopyrite and sphalerite, together with quartz fabric features analyzed by EBSD, indicate low temperature deformation condition. The Tongshan fault is considered to be brittle fault as a whole by the deformation characteristics of minerals and rocks. 3) Structural analysis indicates that relative to the footwall, the hanging wall slipped through SE to NW. The fault displacement is estimated by matching geological boundaries within the hanging wall and footwall and studying the distribution regularity of alteration zones and hydrothermal veins of the Tongshan area. The hanging wall was horizontally offset with a distance of 700 similar to 800m along direction of around NW320 degrees, and was lifted 550 similar to 700m vertically. As a result, outer alteration zones and mineralized zones were cut off. 4) A secondary fault of the Tongshan fault cuts through the Late-Middle Triassic muscovite granite, so the activity time of the Tongshan fault was later than the Late-Middle Triassic. 5) The distribution of alteration zones and orebodies of the Tongshan porphyry deposit is restorated by displacement recovery of the Tongshan fault, which shows that the Tongshan deposit was in spindle morphology before the Tongshan fault activated. It can be inferred from the distribution regularity of mineralization and alteration, that the porphyry, related to mineralization, and undiscovered orebodies may exist in the south of orebody ? in the footwall of the Tongshan fault.
RI
Qin, Kezhang  B-6616-2012 
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 398
EP 414
UT WOS:000397326900007
ER  

PT J
AU Chen, CJ
Chen, B
Wang, ZQ
AF Chen ChangJian
Chen Bin
Wang ZhiQiang
TI Petrology of the Mesozoic magmatic rocks in Ningwu area: Insights from in-situ zircon Hf isotope and Nd-Sr isotopes, EastChina
SO ACTA PETROLOGICA SINICA
AB The Early Cretaceous magmatic rocks in Ningwu basin are composed of basic to intermediate volcanic and andesitic porphyry rocks. Based on detailed study of the zircon U-Pb age, petrological, mineralogical and geochemical data, the characteristics of the magma system, the petrogenesis of different rock types and the nature of the mantle source were discussed to provide new constraints on the origin and tectonic setting of the Mesozoic Ningwu basin. The zircons from pyroxene diorite porphyry yield a U-Pb age of 128.9Ma. Longwangshan volcanic rocks are rich in K, Si and poor in Ca, Mg, whereas Dawangshan volcanic rocks and andesite porphyry are rich in Na. The volcanic rocks and andesitic porphyry are all enriched in LILE and have a slightly depletion of HFSE with negative Ti, Nb, Ta anomaly. Sodic Dawangshan volcanic rocks have slightly lower I-Sr (0.70544 similar to 0.70768), higher Sr content and Mg#. Phenocrysts of plagioclase in pyroxene diorite porphyry display disequilibrium and in-situ zircon Hf isotopes epsilon(Hf)(t)=-6.2 similar to+0.6, indicating magma mixing process. I-Sr(t)=0.70525 similar to 0.70774, epsilon(Nd)(t)=-8.2 similar to-4.1 of the Cretaceous volcanic and andesitic porphyry rocks in Ningwu. The K-rich and Na-rich rocks were generated by melting of enriched lithospheric mantle then the melts mixed with lower crust Kongling grey gneiss and metabasite respectively. The mantle source of the K-rich and Na-rich rocks contain rutile and clinopyroxene respectively. They may form in the stretching environment with lithospheric mantle upwelling and small extent of partial melting, then the partial melts quickly underplayed and heated the grey gneiss and amphibolite base, mixing with its melts.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 415
EP 439
UT WOS:000397326900008
ER  

PT J
AU Wang, C
Ma, XH
Chen, B
Yan, XL
AF Wang Chao
Ma XingHua
Chen Bin
Yan XueLong
TI Late Carboniferous volcanism of the Harlik orogenic belt, Xinjiang: Zircon U-Pb geochronological, geochemical and Sr-Nd isotopic evidence
SO ACTA PETROLOGICA SINICA
AB Voluminous Carboniferous volcanic rocks outcrop in the Harlik of Xinjiang. The rock types include basalt, andesite and rhyolite. However, accurate chronological data of these rocks are lacking, and the petrogenesis and tectonic implications are debated. LA-ICP-MS zircon U-Pb dating results indicate volcanic rocks formed at 302Ma (Late Carboniferous). Basalts are tholeiite series. The low Ti/Y (343 similar to 406) and Ce/Y (1.5 similar to 1.7), high epsilon(Nd)(t) (+3.9) and low Sr-87/Sr-86(i) (0.7043) values, indicate basalts originated from a depleted lithospheric mantle. Intermediate-acid volcanic rocks, which are depleted in HFSE (e.g., Nb, Ta and Ti), and enriched in LILE (e.g., LREE, Sr and Ba), show an island arc affinity. High epsilon(Nd)(t) (+3.3 similar to+6.0), low Sr-87/Sr-86(i) (0.7032 similar to 0.7046) values and young model ages (t(DM)=543 similar to 797Ma) suggest that intermediate-acid volcanic rocks originated from a young source which is composed of island arc materials formed in the processes of subduction and coalition of Paleo-Asian Oceanic. The formation of Late Carboniferous volcanic rocks in the Harlik indicates the transformation from oceanic environment to continental environment. In the post-orogenic setting, asthenosphere upwelling and lithosphere readjustment induced the re-melting of upper mantle and young crust, which resulted in the formation of Late Carboniferous volcanic rocks in the Harlik area.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 440
EP 454
UT WOS:000397326900009
ER  

PT J
AU Zhao, C
Song, GX
Qin, KZ
Li, GM
Li, ZZ
Jin, LY
Meng, ZJ
Zhang, XN
AF Zhao Chao
Song GuoXue
Qin KeZhang
Li GuangMing
Li ZhenZhen
Jin LuYing
Meng ZhaoJun
Zhang XiaNan
TI Indosinian ore-bearing magma source, alteration mineralogy and prospecting signification of the Fulin skarn copper deposit in the northern Great Xing' an Range, NE China
SO ACTA PETROLOGICA SINICA
AB Newly discovered Indosinian Fulin skarn copper deposit is located in the northern Great Xing'an Range and is at a distance of 90km from the east of Xinlin Town. Granite which is responsible for the skarn copper mineralization and granite porphyry which crosscut the granite are the two intrusion rocks in the Fulin deposit. The ore body mainly occurs within the contact zone between Late Permain granite and Paleoproterozoic Xing'anqiao Formation marble and Early Ordovician Huangbanjishan Formation calcareous siltstone. The mineralization is closely related to the skarn. The mineralization process can be divided into two periods:Skarn period and quartz-sulfide period. The two periods can be further divided into five stages:Early skarn stage, regressive alteration stage, oxide stage, early sulfide stage and late sulfide stage. The early sulfide stage is the major stage for Cu mineralization. Chalcopyrite and pyrite are main sulfides, and there are also few sphalerite, galenite and bornite. The alteration types in Fulin ore deposit contain garnet-diopside skarnization, actinolite-tremolite skarnization, epidote skarnization, chloritization, sericitization-clayzation, potassic and partly biotite hornfels. The electron microprobe analyses (EMPA) show that the garnet comprises mainly grossular-andradite series, and mainly belongs to andradite. The end member of pyroxene is dominated by diopside and hedenbergite, and mainly belongs to diopside. The amphibole is mainly tremolite, actinolite and few magnesiohastinsite and ferroedenite. The epidote group comprises mainly zoisite and epidote series. The biotite is mainly Mg-rich lepidomelane and siderophyllite. The chlorite is mainly pycnochlorite and euralite. The feldspar is mainly orthoclase and albite. The EMPA components of garnet from core to rim have an alternation changing between grossular and andradite, and the content of Fe3+ increasing, which suggests the oxygen fugacity of later ore-forming fluid is high. Combined with the Mg-Fe3+-Fe2+ diagram of biotite we think the Fulin skarn deposit is formed in a relatively high oxidation environment. Zircon LA-ICP-MS U-Pb analysis for granite and granite porphyry yield similar to 253Ma and similar to 244Ma respectively, which represents a new metallogenic stage in the Great Xing'an Range. Zircon in-situ Hf isotope analysis reveal the epsilon(Hf)(t) of granite and granite porphyry is -1.6 similar to 2.23 and -3.35 similar to 1.9 respectively, both of them show a very old two-stage model age. So, combined the geological setting we think the granitoid may derive from the old lower crust which was heated by the underlying asthenosphere during the slab break-off after the collision of Songliao massif and Xing'an massif and may contaminated some mantle materials. The appearance of granite porphyry and associated sulfide veins and alterations suggests the possibility of Indosinian porphyry-type mineralization in the Fulin ore deposit field. In addition, the comparison analysis on the components of garnet and pyroxene and the Mn/Fe ratio of pyroxene with the skarn deposits all over the world, we suggest that copper, molybdenum, iron, gold, lead and zinc mineralizations should be comprehensively considered for the further exploration in the Fulin ore district and adjacent areas.
RI
Qin, Kezhang  B-6616-2012 
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 455
EP +
UT WOS:000397326900010
ER  

PT J
AU Zhang, Z
Fang, X
Tang, JX
Wang, Q
Yang, C
Wang, YY
Ding, S
Yang, HH
AF Zhang Zhi
Fang Xiang
Tang JuXing
Wang Qin
Yang Chao
Wang YiYun
Ding Shuai
Yang HuanHuan
TI Chronology, geochemical characteristics of the Gaerqin porphyry copper deposit in the Duolong ore concentration area in Tibet and discussion about the identification of the lithoscaps and the possible epithermal deposit
SO ACTA PETROLOGICA SINICA
AB Gaerqin porphyry copper deposit is one of the most prospecting deposits in Duolong large copper-gold ore concentration area. This paper has a research for the chronology, geochemistry and prospecting direction of the deposit based on the ore-bearing porphyry-granodiorite porphyry and new discovered lithoscaps. The result shows that granodiorite porphyry (SiO2 of 60.01%similar to 62.81%, K2O of 1.86%similar to 2.16%, Al2O3 of 15.12%similar to 16.51%) belong to the calc-alkaline series. Zircon U-Pb age of granodiorite porphyry is 124.4 +/- 0.4Ma (MSWD=0.42, n=25), which suggest Early Cretaceous emplacement. Zircons from ore-forming porphries main show positive epsilon(Hf)(t) values of 1.15 similar to 9.71 and younger tDMc model ages of 559 similar to 1105Ma, while few negative epsilon(Hf)(t) values (-18.65, -19.75) have been found, it indicates that the granodiorite porphyry derived from mantle-derived magmas with minor ancient crustal contamination. The granodiorite porphyry show a right-sloping Rare earth elements (REE) pattern, and enrichment of large-ion lithophile elements (LILE:Rb, Th, U, Sr), depletion of high field strength elements (HFSE:Nb, Ta, Ti, P, Zr), consistent with geochemical feature of arc magmas. Comprehensive studies show formation of the deposit is closely relate to northward subduction of the Bangong-Nujiang ocean. The geochemical characteristics of brecciated lithoscaps samples show obvious hydrothermal replacement and are different from that of lamellar lithoscaps (dense block) samples which may be the products of the bio-genesis and hydrothermal sedimentation. Mineralization indicator elements Cu, Au, Ag, Pb, Zn, As, Sb are anomaly obvious according to geochemical profile, suggesting enormous possibilities of epithermal deposits in this deposit and important exploration significance.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 476
EP 494
UT WOS:000397326900011
ER  

PT J
AU Wang, YY
Bao, Z
Chen, YC
Tang, JX
Leng, QF
Tang, P
Ding, S
Zhou, Y
AF Wang YiYun
Bao Zheng
Chen YuChuan
Tang JuXing
Leng QiuFeng
Tang Pan
Ding Shuai
Zhou Yun
TI Descussion on the mechanism of seperation of copper and molybdenum in Jima porphyry deposit system, Tibet
SO ACTA PETROLOGICA SINICA
AB With the highest exploration and the first large-scale exploitation, Jiama copper polymetallic deposits is a supper-large skarn-porphyry deposit, located at the middle-eastern section of gangdise in Tibet. In this paper, taking the typical phenomenon "copper upside and molybdenum underside" of hornfels-and porphyry-orebodies from Jiama deposit as the starting point, the differences of ore forming fluids among physical and chemical conditions and the migrating behavior of trace elements in the copper and molybdenum mineralization stages have been discussed in virtue of microthermometry, laser Raman testing, synchrotron radiation X-ray fluorescence analysis (SR-XRF) and other researching methods. The results of fluid inclusions microthermometry show that the temperature of ore-forming fluid in the copper mineralization stage (roughly 235 similar to 451 degrees C, mainly between 340 and 380 degrees C) is overall greater than that in the molybdenum stage (roughly 213 similar to 500 degrees C, mainly between 310 and 360 degrees C), sharing the similar salinity that is less than 18%NaCleqv and more than 30%NaCleqv, and lack of the transition zone, which explained ore-forming fluids had experienced boiling. And the results of Raman microprobe show that the oxidizability of ore-forming fluids in the copper mineralization stage is a little stronger than that in the molybdenum mineralization stage, while the reducibility is reverse. Synchrotron radiation X-ray fluorescence analysis of single fluid inclusion indicates that Cu, Au, Fe, Mn, S, As and other elements are mainly and widely distributed in the gas phase, while the residual Mo is mainly concentrated in the liquid phase. Thus it can be concluded the main controlling factors leading to "copper earlier and molybdenum later and copper upside and molybdenum underside" of hornfels- and porphyry-orebodies in the Jiama deposit are the physical and chemical properties of copper and molybdenum, the natures of ore-bearing magma, and their emplacing sequence and depth, along with the different redox and the ulfur content of ore-forming fluids released after that.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 495
EP 514
UT WOS:000397326900012
ER  

PT J
AU Pei, YR
Yang, ZS
Zheng, YC
Hou, ZQ
Tian, SH
Liu, YC
Zhao, XY
Zhou, JS
AF Pei YingRu
Yang ZhuSen
Zheng YuanChuan
Hou ZengQian
Tian ShiHong
Liu YingChao
Zhao XiaoYan
Zhou JinSheng
TI The geochemical characteristics of the Pengcuolin adakitic dykes, southern Tibet: Petrogenesis and implications for regional metallogenesis
SO ACTA PETROLOGICA SINICA
AB The Pengcuolin dykes are located in the west part of the central Gangdese porphyry copper belt, southern Tibet, and they intruded into the Gangdese batholith with width of 3 similar to 5m. LA-ICP-MS U-Pb dating of zircons from two dyke samples yield ages of 9.7 +/- 0.2Ma and 9.9 +/- 0.3Ma. Geochemical analyses indicate that they are characterized by high SiO2 contents (67.05%similar to 69.96%), K2O ranging from 6.05% to 6.88%, MgO from 0.47% to 1.27%, enriched in light rare earth elements (LREE) and large ion lithophile elements (LILE) but depleted in high field strength elements (HFSE), relatively high Sr/Y (45.5 similar to 80.0) and La/Yb (75.7 similar to 110) ratios, showing adakitic affinities. Compared with the Miocene porphyries in the Gangdese porphyry copper belt, the dykes have higher initial Sr-87/Sr-86(i) (0.7120 similar to 0.7123), Pb-206/Pb-204 (18.812 similar to 18.844), Pb-207/Pb-204 (15.705 similar to 15.728), Pb-208/Pb-204 (39.424 similar to 39.523) ratios, but lower epsilon(Nd)(t)values (-10.9 similar to-9.8) and older Nd model ages (tDM=1.36 similar to 1.43Ga). The above geochemical data indicates that the dykes were probably derived from an overthickened lower crust with minor mantle material, and more old crust material have been involved than the Miocene porphyries in the same belt. Meanwhile, the zircon trace element analysis show that they possess low fO2 values (?FMQ=-6.7 similar to+2.1, average=-1.4). Thus the absence of regional metallogenesis is likely attributed to:(1) the limited sulfide cumulated in the lower crust as a result of the underplating of former arc basalitic magmas; (2) the low fO(2) that are not favor to ore-forming metal. Combining with previous study, it suggests that contribution of juvenile mantle components to the lower crust beneath the south Tibet is the key factor for mineralization in the Gangdese porphyry Cu belt.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 515
EP 528
UT WOS:000397326900013
ER  

PT J
AU Chen, X
Liu, JJ
Zhang, DH
Zhang, QB
Yang, SS
Li, YC
Cao, Q
AF Chen Xian
Liu JiaJun
Zhang DeHui
Zhang QiBin
Yang ShangSong
Li YanChuan
Cao Qiang
TI Re-Os dating of molybdenites and S-Pb isotopic characteristics of the Cuihongshan iron polymetallic deposit, Heilongjiang Province
SO ACTA PETROLOGICA SINICA
AB The Cuihongshan Fe-polymetallic deposit is located in the northern segment of the Lesser Xing'an-Zhangguangcai Range which is an important porphyry-skarn metallogenic belt in China. Recent studies were mainly focused on the deposit geology, and the geochronology of granites in the Cuihongshan mining area. However, mineralization age and source of ore-forming minerals remain unclear. We present detailed Re-Os isotopic dating of molybdenites, S-Pb isotopic analysis, together with geochemistry, U-Pb geochronology data published, to reveal the ore-forming age, source of ore-forming materials of the Cuihongshan deposit and the tectonic setting for magmatism and mineralization in the Lesser Xing'an-Zhangguangcai Range. Seven molybdenite samples from Cuihongshan ore spot yield a Re-Os isochron age of 205.1 +/- 1.9Ma, with model ages ranging from 205.6Ma to 202.0Ma and the weighted mean age of 204.9 +/- 1.3Ma. Six molybdenite samples in Cuizhong ore spot obtaine a Re-Os isochron age of 204.0 +/- 3.9Ma, with the weighted mean age of 204.1 +/- 2.4Ma and the model ages of 200.9Ma to 206.7Ma. The ages show that the Cuihongshan Fe-polymetallic deposit occurred in the Late Indo-Chinese epoch. Together with the published ages of granites and the connection relationship between ore bodies and monzogranite in the Cuihongshan mining district, the authors hold that monzogranite (199 +/- 3.1Ma) is most related to the Cuihongshan Fe-polymetallic deposit. The content of Re from the molybdenites in the Cuihongshan and Cuizhong ore spot ranges from 0.03605x10(-6) to 0.5810x10(-6) and 0.2585x10(-6) to 1.758x10(-6), respectively, suggesting that the ore-forming materials may come from crustal source. The d34S values of metal sulfide in the Cuihongshan deposit varies from 2.0 parts per thousand to 6.9 parts per thousand, averaging 3.8 parts per thousand, showing a deep source of magmatic sulfur. The ratios of Pb-206/Pb-204, Pb-207/Pb-204 and Pb-208/Pb-204 of metal sulfides range from 18.650 to 19.058, 15.584 to 15.727 and 38.177 to 38.65 respectively, showing a mixture source of upper mantle and lower crust, and have similar affinity to that of the monzogranite. It also indicates that the mineralization of the Cuihongshan deposit is related to the monzogranite. Combining with the geochemical characteristics, geochronology of the region, the authors thought that the Lesser Xing'an-Zhangguangcai Range experienced a post-orogenic extensional tectonic setting controlled by the Paleo-Asian oceanic tectonic system in Late Indo-Chinese epoch. And the mineralization of the Cuihongshan, Xiaoxilin, Daxilin skarn deposit are related to the extensional tectonic setting. However, it was transition to a compressional setting constrained by Circum-Pacific tectonic system in the Early Jurassic. The mineralization of contemporaneous porphyry type deposits in the region, such as the Huojihe, Cuiling, Xulaojiugou, Wudaoling, Xingshan, Daheishan, Luming deposit, are related to the tectonic setting.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 529
EP 544
UT WOS:000397326900014
ER  

PT J
AU Lu, YC
Liu, JJ
Zhang, D
Wang, DZ
Sun, H
Wang, B
Zhang, WH
Kang, JK
AF Lu YingChuan
Liu JiaJun
Zhang Dong
Wang DaZhao
Sun Hao
Wang Bin
Zhang WenHua
Kang JianKun
TI Zircon U-Pb LA-ICP-MS dating, petrogenesis and tectonic implication of the granodiorite at the Shuangpengxi skarn type gold. copperdeposit, West Qinling
SO ACTA PETROLOGICA SINICA
AB The Shuangpengxi skarn gold-copper deposit is located at the Tongren-Zeku retroarc foreland basin of the West Qinling orogenic belt. The regional strata are mainly composed by the Lower Permian Ganjia Formation and the Upper Triassic Longwuhe Group. The intrusive rocks in the mining area are mainly granodiorite, and the orebodies are located in skarns occurring in the contact zone between granodiorite and marbles/dolomites of the Ganjia Formation. Zircons from the granodiorite samples yield a U-Pb age of 233.9 +/- 2.8Ma. Whole rock geochemistry analysises show that the granodiorite characterized by high SiO2 and K2O contents, low Al2O3 and MgO contents, with Mg# values of 33.6 to 35.2. The samples are enriched in LREEs ((La/Sm)N=3.14 similar to 11.6) and LILEs, and have relatively flat HREE pattern ((Gd/Yb)N=1.17 similar to 1.63). The granodiorite has ISr values ranging from 0.708299 to 0.708748, epsilon(Nd)(t) from -12.6 to -9.47, Pb-206/Pb-204 from 18.623 to 18.965, Pb-207/Pb-204 from 15.610 to 15.652 and Pb-208/Pb-204 from 39.124 to 40.732. Ratios of Nb/Ta (5.5 similar to 12.9) and Ce/Pb (3.0 similar to 11.6) are similar to magmas derived from the melting of crustal material. The fabric of mafic microgranular enclaves in the granodiorite show characteristics of magmas mixing. The Shuangpengxi granodiorite was derived by partial melting of high-K basaltic rocks of the lower crust, with crust-mantle magma mixing. The tectonic setting of Shuangpengxi granodiorite indicates that the West Qinling orogenic belt was at the transition stage from oceanic crust subduction to continental collision during the middle Triassic. Exhumation and break-off of the subduction slab caused asthenosphere upwelling, which provided heat and triggered partial melting of the overlying lower crust beneath West Qinling, and generated primitive felsic magmas which formed many granitoid rocks.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 545
EP 564
UT WOS:000397326900015
ER  

PT J
AU Shi, Y
Wang, YW
Wang, JB
Wang, LJ
Ding, RF
AF Shi Yu
Wang YuWang
Wang JingBin
Wang LiJuan
Ding RuFu
TI Petrogenesis of ankaramite from Middle Devonian Beitashan Formation, northern margin of Junggar and its implication on Late Paleozoic ridge subduction
SO ACTA PETROLOGICA SINICA
AB Ankaramite of Beitashan Formation from the northern margin of Junggar is a type of pyroxene phyric island arc basalt and believed as a result of ridge subduction. However, its petrogenesis is not very clear. This study systematically analyses the geochemistry of the bulk rocks and the composition and chemical zoning patterns of clinopyroxene phenocrysts. The trace elements including compatible elements and incompatible elements of the bulk rocks display magma mixing geochemistry characteristics, and the magma mixing process is defined as continuous high Mg# magma recharge by reverse zoning patterns of the diopside phenocrysts. The extreme high contents of compatible elements of ankaramite indicate that the continuous upwelling high Mg# magma is picritic, while the endiopside of the ankaramite is carried into the magma system by upwelling picritic magma. The magmatic process forming the Laoshankou ankaramite is controlled by the upwelling process of picritic magma, which is believed as a result of high partial melting of asthenosphere mantle under the slab window caused by ridge subduction. The magmatic process forming the Laoshankou ankaramite matches well with slab window of ridge subduction, therefore, Laoshankou ankaramite is possibly a product of ridge subduction.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 565
EP 578
UT WOS:000397326900016
ER  

PT J
AU Xia, L
Yan, QR
Xiang, ZJ
Jiang, W
Song, B
Chen, HM
AF Xia Lei
Yan QuanRen
Xiang ZhongJin
Jiang Wen
Song Bo
Chen HuiMing
TI Late Triassic andesitic accrtionary arc in the central Songpan-Ganzi terrane and its tectonic significance
SO ACTA PETROLOGICA SINICA
AB Detailed observations presented in this paper show that the andesite blocks in the Upper Triassic turbidites in the central Bayan Har-Songpan Ganzi terrane (Songpan-Ganzi terrane in short) in the northern Tibet Plateau were the components of an accretionary arc based on the accretionary wedge. The andesites are highly inhomogeneous in the phenocryst and matrix textures, geochemical and isotopic compositions (e.g. A/CNK=0.62 similar to 1.15, s=1.99 similar to 2.35, Mg#=38 similar to 46, epsilon(Nd)(t)=-6.32 similar to-2.98), which indicates that magma of the accretionary arc was derived from various sources. High affinities of Sr and Nd isotopes with Triassic submarine turbidites suggest that andesitic magma of the accretionary arc was predominantly derived from melting of the turbidite matrix of the accretionary wedge, and somewhat contaminated by the ultramifc/mafic components form the oceanic lithosphere. Zircon U-Pb analyses for the andesites, plus syschronous S-type granites (228 +/- 2Ma similar to 204 +/- 7Ma), indicate that the accretionary arc was occurred in the Norian of Late Triassic (226.8 +/- 1.9Ma similar to 213.7 +/- 0.9Ma). Previous working showed that the northestern part of the Songpan-Ganzi terrane was actually a peripheral foreland basin. Consequently, the Songpan-Ganzi terrane was one integrated by at least two tectosomes, evolved paleo-Tethys ocean and a peripheral foreland basin. The former is the main part of the Songpan-Ganzi terrane and composed of subduction-related accretionary complexes followed with the rapid shortening of the Songpan-Ganzi paleo-Tethys ocean in the Triassic, on which developed the andesitic accretioanry arc in the Norian. The latter was constructed by collision between the West Qingling arc (248 similar to 234Ma) and the Yangtze block in the Ladinian to Norian.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 579
EP 604
UT WOS:000397326900017
ER  

PT J
AU Ji, L
Liu, FL
Wang, F
Cai, J
Wang, W
Tian, ZH
Liu, LS
AF Ji Lei
Liu FuLai
Wang Fang
Cai Jia
Wang Wei
Tian ZhongHua
Liu LiShuang
TI Ployphase metamorphism in Diancang Shan-Ailao Shan complex zone: Constraints from U-Pb dating and trace elements of zircons in metasedimenary rocks, Gasa area
SO ACTA PETROLOGICA SINICA
AB The Diancang Shan-Ailao Shan metamorphic complex belt is located on the southeastern margin of Tibetan Plateau, which formed by the Late Permian to Middle-Late Triassic collision of the Yangtze plate and Indochina plate. The complex belt mainly comprises different kind of paragneisses, schists, quartzites, marbles, amphibolites, which have experienced extensive mylonitization and anatectic melting. In this paper a comprehensive study of zircon cathodoluminescence (CL) image, trace element, mineral inclusion, external morphology and LA-ICP-MS U-Pb dating on meta-sedimentary rocks from the Gasa area was accomplished. Two different metamorphic events are revealed by garnet-bearing plagioclase two-mica schist and sillimanite-garnet biotite monzogneiss from the Ailao Shan Complex (ALSC). Thirty metamorphic zircons from the garnet-bearing plagioclase two-mica schist yield consistent ages ranging from 215 +/- 6Ma to 227 +/- 5Ma and give a weighted mean Pb-206/U-238 age of 222.3 +/- 1.2Ma (n=30, MSWD=0.27), In addition, most of these zircons show rounded or ovoid external morphology, flat HREE pattern ((Lu/Gd)N=0.73 similar to 4.08) and weak negative Eu anomaly, similar to metamorphic zircon from typical high grade metamorphic rocks. These zircons gives a large range of Th/U ratios (0.06 similar to 0.84, mean=0.45), which maybe associated with the decompositon of Th-enriched mineral (such as monazite). The nearly identical metamorphic ages with those from the Diancang Shan and Yuanyang areas indicate a metamorphic event associated with the closure of Paleo-Tethys in Middle-Late Triassic and the Diancang Shan-Ailao Shan complex belt is one of essential sutures zones in the Sanjiang area, southeast of Tibetan Plateau. Moreover, twenty-eight metamorphic zircons (rims) in the sillimanite-garnet biotite monzogneiss yield concordant ages ranging from 27.3 +/- 0.5Ma to 31.9 +/- 0.5Ma, and give a weighted mean U-Pb age of 29.4 +/- 0.53Ma (n=28, MSWD=2.0). Petrographic study indicated that the sillimanite-garnet biotite monzogneiss had experienced peritectic reaction and most zircons show rounded or ovoid external morphology. Overgrown rims contain inclusion assemblage of sillimanite+K-feldspar+quartz+biotite+monazite, with low Th/U ratios (0.01 similar to 0.1), flat REE pattern ((Lu/Gd)N=0.45 similar to 7.59) and moderate negative Eu anomalies, all of which demonstrate that the metamorphic zircons were grown in a background coexisting with garnet and feldspar and, the anatexis melting possibly corresponded to the regional ductile strike-slip shear in Oligocene. Besides, six inherited zircons from the two samples have ages from 528Ma to 783Ma, high Th/U ratios (>0.1), steep HREE pattern, exhibit oscillatory zoning in the CL images and prismatic shapes with etching and pitting surface. All these features are corresponding to magmatic zircon underwenting an erosion-transportation-deposition process. As a consequence, the meta-sedimentary rocks in the ALSC should contain the Neoproterozoic and Early Paleozoic source, indicating that the ALSC in studying area do not belong to the basement of the Yangtze plate.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 605
EP 621
UT WOS:000397326900018
ER  

PT J
AU Huang, YP
Liu, XF
Deng, JH
Zhao, FF
Xia, DW
Chen, H
AF Huang YuPeng
Liu XianFan
Deng JiangHong
Zhao FuFeng
Xia DeWei
Chen Hao
TI Petrographic and geochemical characteristics for Bengge alkaline igneous complex and its geological significance in Shangri-La, Yunnan, China
SO ACTA PETROLOGICA SINICA
AB It is development a suit alkali-rich and high-K igneous that are represented by Bengge alkaline complex igneous in Shangri-La area, Yunnan Province. The intrusion has a wide range of SiO2 content, higher FeOT and alkali while lower Al2O3, MgO, CaO content; and enriched in LILE and LREE, depleted in HFSE relatively while transition elements significantly such as Cr, Co, Ni. And it also has the anomaly from weak negative to strong positive with dEu and dCe, and shows characteristics of both adakitic and island arc volcanic rocks with trace elements. The study of petro-geochemistry suggests the Bengge intrusion is not the product of simple crystallization differentiation of single magma. Its magma resources are diversity and multi-period, and they mainly represented the magmatism of subduction oceanic slab and mantle wedge and low-crust partial melting in Late Triassic Indosinian and phlogopite-bearing metasomatic enrichment mantle partial melting with a low degree in Cenozoic. The formation and evolution of Bengge intrusion had roughly undergone three stages that are formation of initial magma in Late Indosinian, superimposing of subsequent magma in Yanshanian and magma emplacing in Himalayan, and with mantle fluid metasomatism and crust-mantle materials contamination caused by the former in the whole magmatism process. And the gold mineralization related to Bengge alkaline complex igneous is mainly subject to the multi-period magma interacting with ore-bearing mantle fluid and mantle fluid metasomatic superimposing contamination. The bonanza of the gold mineralization may be located in deep. And according this, we suggest that the Bengge alkaline complex igneous has a deep metallogenic prospect of exploration and development.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 622
EP 638
UT WOS:000397326900019
ER  

PT J
AU Zhang, Y
Shi, YH
Song, CZ
Li, JH
Ren, SL
Zhu, L
Feng, Q
Yang, F
AF Zhang Yan
Shi YongHong
Song ChuanZhong
Li JiaHao
Ren ShengLian
Zhu Lin
Feng Qi
Yang Fan
TI Sedimentary environments and its geological significance of Jurassic Moshan Formation in the northeastern margin of Dabie Mountain
SO ACTA PETROLOGICA SINICA
AB Jurassic is an important period in basin-mountain coupling studies between Dabie orogenic belt and adjacent basins. The Jurassic strata on the periphery of Dabie Mountain provide well constraints on the orogenic processes of Dabie Mountain and the exhumation and uproofing of deep subduction rocks. This paper chooses Jurassic Moshan Formation in Yueshan area of Anqing in the northeastern margin of Dabie Mountain as the study object. Fine analysis of grain size, detrital composition, heavy mineral assemblages and U-Pb isotope chronologic dating of detrital zircons are carried out on clastic rocks of Moshan Formation. The lithological and sedimentary characteristics and result of grain size analysis all indicated sedimentary environment of clastic rocks of Moshan Formation is fan delta front subaqueous distributary channels. Results of detrital composition, heavy mineral assemblages and U-Pb isotope chronologic dating suggest that the provenance of clastic rocks are mostly derived from South China Plate, and Susong complex in Dabie orogenic belt also provide a small amount of detritus. The lack of garnets and Triassic metamorphic zircons suggest that the high pressure-ultrahigh pressure metamorphic rocks may have not been exposed to the surface in the Early Jurassic.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 639
EP 652
UT WOS:000397326900020
ER  

PT J
AU Die, W
Zhang, LH
Qiang, S
AF Die, Wang
Zhang, Luhuan
Qiang, Shan
TI Advances on melt inclusion studies
SO ACTA PETROLOGICA SINICA
AB Despite nearly fifty years of modern research on silicate melt inclusions (MI), only within the past 10 similar to 15 years have volcanologists, petrologists and fluid inclusionists come to regularly accept their utility for characterizing magmatic systems. Their relatively slow acceptance was likely due to a number of factors including:1) Lack of reliable analytical techniques; 2) Concern that MI's evolution after trapping; 3) Data sets indicative of some heterogeneous melts existed; 4) High homogenization temperatures make the data not easy to reliable. With improvements in analytical methods and careful studies of MI systematics, workers are increasingly convinced of the utility of these features to unravel the complexities of magmatic systems. Melt inclusions have "come of age" Recent studies provide compelling evidence for the compositions of dissolved and exsolved volatiles in magma reservoirs. Evidence for immiscibility of gases, hydrosaline brines and magma demonstrate that magmatic phase relations are often more complicated than can be inferred by inspection of crystalline phase. After trapping melt inclusions may undergo significant change (crystallizations), and other potential phenomenon include diffusions of volatile, vapor exsolution, and venting. With careful study we can decide MI's composition is useful and reliable.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 2
BP 653
EP 666
UT WOS:000397326900021
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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