首页 | 学报简介 | 编委会 | 投稿指南 | 订阅指南 | 文件下载 | 期刊浏览 | 关键词检索 | 高级检索 | 联系我们   

《岩石学报》2017年第33卷第3期发表论文已被Web of Science核心合集收录

 

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

FN Thomson Reuters Web of Science™
VR 1.0
 

PT J
AU YongZhang, Z
Li, XY
Zheng, Y
Shen, WJ
He, JG
Yu, PP
Niu, J
Zeng, CY
AF YongZhang, Zhou
Li XingYuan
Zheng Yi
Shen WenJie
He JunGuo
Yu PengPeng
Niu Jia
Zeng ChangYu
TI Geological settings and metallogenesis of Qinzhou Bay-Hangzhou Bay orogenic juncture belt, South China
SO ACTA PETROLOGICA SINICA
AB The Qinzhou Bay (Q) to Hangzhou Bay (H) metallogenic belt situated in South China, is one of national-wide key metallogenic zones recognized and planned by the China Geological Survey, and quite famous due to its scale, clustering of deposits and variety of deposit types and useful associate metals. It is also called the Qinzhou Bay to Hangzhou Bay orogenic juncture belt, corresponding to the transitional tectonic zone separating the Yangtze plate and the Cathaysian plate. It is shown that the Q-H belt is an ancient subduction system. Besides Neoproterozoic, there existed Paleozoic continent-oceanic subduction system as evidenced by the occurrence of fossil oceanic crust. The Mesozoic tectonic trasition is a greatly significant geological event, and it made the Q-H belt change from the Tethyan tectonic domain to the West Pacific tectonic domain, resulting in intra-continental lithosphere stretching and thinning and finally the outburst of Yanshanian magmatism and mineralization in the belt area. Mantle-derived end character is observed, indicating that mantle source materials were involved in the mineraization. The Q-H belt may be referred to as a porphyry copper (molybdenum) deposit belt and a fossil ocean-floor exhalation-hydrothermal deposit belt, since granitic porphyry Cu (Mo) deposits are scattered over it, as well as rich VMS and SEDEX types of deposits do. It is concluded that the Q-H belt is a fossil subduction system-reworked metallogenic belt, characterized by mineralization of Yanshannian reworking/superimposing on fossil plate subduction system. The Yanshanian granitic porphyry Cu (Mo) deposits originated from partial melting of the island-arc basaltic rocks associated to subduction of the fossil oceanic plate.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 667
EP 681
UT WOS:000399303400001
ER  

PT J
AU Zheng, Y
Yu, P
Wang, YJ
Lin, ZW
AF Zheng Yi
Yu Pan
Wang YueJun
Lin ZhenWen
TI Geological characteristics and genetic types of four series of ore-forming systems at West Guangdong and East Guangxi and their implication for the tectonic evolution of Qinzhou-Hangzhou Joint Belt
SO ACTA PETROLOGICA SINICA
AB The area of West Guangdong-East Guangxi is one of the important base providing large amounts of gold, silver, copper, molybdenum, lead, zinc and pyrite, etc. Four main series of ore-forming systems in this area are distinguished. The Dajiangping pyrite deposit, hosted in the Daganshan Formation, is consisted of massive and banded ores, which possibly represent a VMS mineralization system form in a Neoproterozoic back-arc basin. The Panlong sedimentary exhalative (SEDEX) Pb-Zn deposit is hosted in the marine calcite of Devonian Shanglun Formation, interpreted to be formed in a passive continental margin. The Hetai gold deposit in hosted in silicified fracture zones of Sinian metamorphic rocks, which is a typical orogenic gold deposit formed in the Indosinian to Yanshanian collisional or strike-slipping setting. The Yuanzhuding Cu-Mo deposit is related to porphyry granite and formed at 155Ma intra-continental extensive setting. Combining with the published tectonic evolution and geochronological data, the area of West Guangdong and East Guangxi have experienced Neoproterozoic subduction, Devonian passive continental margin, Indosinian-Yanshanian collision (or strike-slip) and Late Yanshanian intra-continental extension, which maybe code the Qinzhou-Hangzhou joint belt also experiencing the similar tectonic evolution.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 682
EP 694
UT WOS:000399303400002
ER  

PT J
AU Xu, DR
Zou, FH
Ning, JT
Deng, T
Wang, ZL
Chen, GW
Zhang, JL
Dong, GJ
AF Xu DeRu
Zou FengHui
Ning JunTao
Deng Teng
Wang ZhiLin
Chen GenWen
Zhang JianLing
Dong GuoJun
TI Discussion on geological and structural characteristics and associated metallogeny in northeastern Hunan Province, South China
SO ACTA PETROLOGICA SINICA
AB The Jiangnan Orogen has been generally considered as a transitional zone between the Yangtze Block and the Cathaysia Block. The evolution of Jiangnan Orogen led to the significant difference of the space-time of the tectonic deformation, which determines the complexity of the gold and gold-polymetallic mineral resources. By the comprehensive analysis of regional geological characteristics, ore-controlling structural features, geological features of the typical deposits, regional tectonic evolution and associated metallogeny, this paper holds that: (1) regional tectonic background was the basis for development of ore field structure, the key to form the structure pattern in NE Hunan Province, South China, was the compressive stress field in Indosinian and the extension in Yanshanian made the area into a mineral-rich mineralization occurrence; (2) the ore field structure dominated by NE(NNE) led to the construction of complex EW- and near EW-trending structures, multi-stage tectonic activities created the district, which formed NW-trending folds and NE-trending fault system and a structural framework that features" two uplifts, three basins" was presented; (3) the main ore-controlling structure style is the ductile shear; (4) the state of ore body was closely related to the evolution and composition of tectonics and the current occurrence status of the mineral resources were limited by the deformation and superimposed on transformation. Finally, according to the geological characteristics of the deposits, combined with regional tectonic evolution, we have proposed the metallogenic model of Au and Au-polymetallic mineralization in the Jiangnan Orogen domain in the Hunan.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 695
EP 715
UT WOS:000399303400003
ER  

PT J
AU Ding, T
Ma, DS
Lu, JJ
Zhang, RQ
Zhang, ST
AF Ding Teng
Ma DongSheng
Lu JianJun
Zhang RongQing
Zhang ShiTao
TI Mineral geochemistry of granite porphyry in Huangshaping pollymetallic deposit, southern Hunan Province, and its implications for metallogensis of skarn scheelite mineralization
SO ACTA PETROLOGICA SINICA
AB The Huangshaping deposit, located in southern Hunan Province, is one of the largest polymetallic ore deposits in this region and is unique for its metals combination of W-Mo-Pb-Zn and the occurrence of significant reserves of all these metals. Previous research suggested that the scheelite mineralization is predominated by the deep magma chamber rather than the granite porphyry because of the limited volume of the latter, even though they have close spatial and temporal relationship. In this paper, wolframite and columbite are found coexisting with unaltered biotite in granite porphyry, and their chemical compositions are determined by electron microprobe analysis. Additionally, in situ LA-ICP-MS analysis is performed to obtain the REEs contents of scheelite in order to provide new evidence for the materials and fluids sources of the scheelite mineralization. Wolframite and columbite can be the direct evidence that the granite porphyry dominates the W mineralization, and also suggest that W-bearing minerals might concentrated at the late magmatic stage or early hydrothermal stage, the high F contents in biotite (> 3%) indicate that the hydrothermal fluids were derived from high evolved and F-rich magma. The REEs patterns of scheelites are consistent with granite porphyry, except that the former are HREEs-depleted but rich of Eu. This suggests that the materials and fluids for scheelite mineralization are derived from granite porphyry, and the precipitation of garnet in the anhydrous skarn stage results for the fluids depleted of HREEs but rich of Eu, and finally scheelite is crystallized in these fluids. At the same time, the Eu contents in scheelites from the Huangshaping deposit are of negative correlation compared with the contents of Sm and Gd, which indicates the Eu must exist as Eu2+ in the hydrothermal fluids, meaning that the fluids is possibly reduced. Combining with previous research, the new evidence provided in this paper suggests that the material (W) and fluids for the scheelite mineralization were derived from high evolved and F-rich granite porphyry while the Ca must come from dissolution of the wallrock limestone, and the granite porphyry is a proxy to explore the hidden W mineralization in Huangshaping deposit.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 716
EP 728
UT WOS:000399303400004
ER  

PT J
AU An, YF
Li, XY
Wang, Y
Zhu, QK
Liu, BX
Zhang, WY
Zheng, LG
Nenzhelele, JDN
AF An YanFei
Li XingYuan
Wang Yu
Zhu QiKuan
Liu BingXiang
Zhang WenYuan
Zheng LiuGen
Nenzhelele, J. D. N.
TI The microfabrics and significance of pyrite from the Pozaiying porphyry molybdenum deposits in southern section of Qinzhou-Hangzhou belt
SO ACTA PETROLOGICA SINICA
AB The Pozaiying deposit is one of most significant deposits in southwestern section of Qinzhou-Hangzhou Belt. The deposit is of the central planar alteration type and ore bodies are composed of three types' veins of A, B and D. In order to deepen the understanding of the mineralization process, some pyrite samples among ore veins from Pozaiying deposits were retrieved to characterize the signature of microfabrics with SEM, XRD and Raman spectral analysis for reshaping the metallogenic process of thermodynamics and kinetics. The results of SEM show three points as follows:(1) pyrite with droplets-shaped microcrystalline on crystal face among A vein is rare, hypautomorphic-xenomorphic, and about 100 similar to 200 mu m; (2) pyrite with oval-layered microcrystalline on crystal face among B vein is common, euhedral-hypautomorphic, and about 500 similar to 1000 mu m; (3) pyrite with angular and linear microcrystalline on cubic crystal face among D vein is about 10 similar to 20mm. Our analysis indicates that the size of pyrite particle increases and microcrystalline on crystal faces becomes more regular from A vein to B vein to D vein, which reveals that the crystallization rate of pyrite may be reduced and the crystallization environment tends to be stable from early to late period. The results of XRD shows an obvious difference that the main peak is 28.5 degrees and the secondary peak is 37.1 degrees in A vein, and respectively, are 37.1 degrees and 33.1 degrees in B vein, and are 33.1 degrees and 56.3 degrees D vein were detected, although the outline of the curves look similar between each sample of pyrite in different veins. All the above evidences indicate that pyrite in A vein may consist of an octahedron enclosed with (1 1 1) crystal plane and pentagonal dodecahedron enclosed with (2 1 0) crystal plane, by which, we speculate at its formation temperatures should be higher than 300 degrees C. Samples in B vein should be made up of pentagonal dodecahedron enclosed with (2 1 0) crystal plane and cubic enclosed with (1 1 1) crystal plane, and its formation temperatures should be between 200 similar to 300 degrees C or higher. Samples in D vein mainly consist of cubic enclosed with (1 0 0) crystal plane and its formation temperatures should be less than 200 degrees C. The Raman spectrum reveals that all the parameter of samples in A vein nu(Eg) = 348.0 similar to 350.7cm(-1), nu(Ag) = 385.2 similar to 386.5 cm(-1) and nu(Tg) = 441.9 similar to 422.8cm(-1), compare with them, the corresponding value of B vein and D vein were shifting to low frequencies by 2 similar to 6cm(-1) and 5 similar to 14cm(-1); the scattering intensity of sample in A vein I-Eg=388.8 similar to 745.5, I-Ag=1532.8 similar to 2071.8 and I-Tg=238.9 similar to 254.4, while the corresponding scattering intensity of B vein and D vein are enhanced significantly. Comparative analysis shows that the characteristics of Raman spectrum shift towards low-frequencies from A to B to D indicating that the growth pressure of the three types of pyrite decreases gradually and the scattering intensity increases from A to B to D also indicates that the formation temperatures between the three gradually decreases. Thus, our studies suggest that the formation temperature and pressure of the vein from early to late decrease in Pozaiying molybdenum deposit.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 729
EP 738
UT WOS:000399303400005
ER  

PT J
AU Yu, PP
Zhou, YZ
Zheng, Y
Chen, BH
Yang, W
Niu, J
Zhou, WL
AF Yu PengPeng
Zhou YongZhang
Zheng Yi
Chen BingHui
Yang Wei
Niu Jia
Zhou WeiLei
TI Neoproterozoic subduction of the south section of Qin-Hang orogenic junction belt: Evidence from the geochronology and geochemistry for the metabasite in Guizi melange, western Guangdong Province, South China
SO ACTA PETROLOGICA SINICA
AB The Yangtze and Cathaysia blocks had integrated and formed the Qin-Hang orogenic juncture belt (QHOJB) along Jiangshan-Shaoxing fault since Neoproterozoic. The complex tectonic evolution of the QHOJB have attracted considerable attentions. The Guizi melange is located in the southern section of QHOJB. According to the field geological observations, the tectonic blocks are strongly deformed metamorphic metabasite and deep-sea chert, matrix rocks are quartzite, mica-schist and manganese enriched siliconargilaceous rock with Bouma sequence. A set of U-Pb zircon geochronological and elemental data for the metabasite from Guizi melange are present in this paper. The metabasite yields a weighed mean 206Pb/238U age of 94811Ma. Based on the SiO2, Na2O, K2O, these samples belong to calc-alkaline series except for a small portion of tholeiitic series. CIPW standard mineral compositions are similar to quartz tholeiite-olive tholeiite. They also show high TiO2 (average 1.85%), P2O5 (average 1.85%), no or slightly negative Eu anomaly, moderate LREE/HREE fractionation (presented by chondrite normalized (La/Yb)(N)=2.65 similar to 3.89, LILE (Rb, Ba, Th, U) enriched and HFSE (Nb, Zr, Hf) slightly depleted characteristics. Such geochemical signatures indicate that they are typical subduction-related arc volcanic rocks. In addition, Nb (7.56x10(-6)similar to 16.11x10(-6)), Nb/U (18.39 similar to 25.65), (Nb/La)(N) (0.76 similar to 0.94, primary mantle normalized) are similar to those Nb-enriched basalts instead of typical island arc basalts. Combining with geological and geochemical study, this paper suggests the Guizi tectonic melange is the record of Neoproterozoic paleo South China Ocean subduction in the southern section, providing an important clue for the southeast boundary of QHOJB.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 739
EP 752
UT WOS:000399303400006
ER  

PT J
AU Niu, J
Zheng, Y
Zhou, YZ
Guo, XY
AF Niu Jia
Zheng Yi
Zhou YongZhang
Guo XiaoYu
TI A fluid inclusions study of the Panlong lead-zinc deposit and its implication for genesis
SO ACTA PETROLOGICA SINICA
AB The Panlong lead-zinc deposit is a large Pb-Zn deposit discovered in recent years. It is located in the Devonian Shanglun Formation, which is in the southern section of Qingzhou bay-Hangzhou bay metallogenic belt. Based on the field and petrographic observation, three metallogenic stages are recognized:1) The primary sedimentary stage. In this stage, sulfides were preserved with scattered, layered-banded, disseminated, colloidal to metacolloidal, framboidal, and crumple structures; 2) Reworked stage, represented by stockwork, false brecciated, band, miarolitic, globular, metasomatic, pressure structures; 3) The surface oxidation stage. In this contribution, the characteristics of the fluid inclusions locked in barite of the first two ore-forming stages were studied systematically. The type of fluid inclusions is relatively sample dominated by the liquid (H2O)-rich inclusions, gas-liquid inclusions. The homogenization temperatures of fluid inclusions in primary sedimentary stage are 110.0 to 234.3 degrees C (mean=147 degrees C), with corresponding salinities of 0.33% to 15.57% NaCleqv (mean=7.09% NaCleqv). In contrast, the homogenization temperatures of reworked stage range from 107.9 to 179.5 degrees C (mean=139 degrees C), and the calculated salinities are 1.82% to 21.24% NaCleqv (mean=10.90% NaCleqv). Laser Raman spectroscopic analyses illustrated that the mainly gaseous composition of fluid inclusion is H2O. The characteristics of ore-forming fluids in primary sedimentary stage is consistent with typical SEDEX deposits, while showing similarities with SEDEX or epithermal deposits in the reworkd stage. Taking regional evolution into consideration simultaneously, the Panlong lead-zinc deposit is defined as a reworked SEDEX deposit.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 753
EP 766
UT WOS:000399303400007
ER  

PT J
AU Gao, L
Lu, YT
Yu, PP
Xiao, F
AF Gao Le
Lu YuTong
Yu PengPeng
Xiao Fan
TI Three-dimensional visualization and quantitative prediction for mine: A case study in Xiayuandong Pb-Zn ore deposits, Pangxidong region, southern part of Qin-Hang metallogenic belt, China
SO ACTA PETROLOGICA SINICA
AB Mineral resources are the material basis of human survival and the progress of human society. In recent years, with the reduction of shallow deposits, applying new technique and method to search for deposit become an important research direction. The three-dimensional geological modeling technology which based on digital, three-dimensional visualization and quantitative prediction of mineral provides a powerful tool for the current mineral ore prediction and exploration work. Based on the foundation of modern metallogenic prediction theory, this paper builds a three-dimensional geological model of the Pangxidong region, Qin-Hang metallogenic belt, which includes geology, geophysics, geochemistry, drilling and other geological characteristics. The model reveals the structure, geochemical anomaly characterization and formation rock elements, thus explores the genesis and distribution of ore deposits. Based on the previous geology, geophysics, geochemistry information, the weights-of-evidence method is used to calculate the prospecting posterior probability, make three-dimensional mineralization forecast and divide prospecting targets and estimates the target area of minerals. The fracture buffer area, geochemical anomaly and Donggangling sedimentary rock formation are used as evidence factors in the calculation. Three metallogenic targets including Fe-Mn ore, Pb-Zn ore and Pb-Zn-Ag ore were delineated, and the prediction of mineral resources is 88710 ton. The research results showed that a comprehensive analysis of geological, geophysical, geochemical and drilling data could help to locate the mineral ore body in the three-dimensional and make the quantitative mineral prediction. The method could effectively identify anomalies caused by mineral ore body and delineate of mineralization prospective areas which provides a new direction of the mineralization prediction research. This effective method could be easily applied to other mining areas.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 767
EP 778
UT WOS:000399303400008
ER  

PT J
AU Xiao, F
Chen, JG
Hou, WS
Wang, ZH
AF Xiao Fan
Chen JianGuo
Hou WeiSheng
Wang ZhengHai
TI Identification and extraction of Ag-Au mineralization associated geochemical anomaly in Pangxitong district, southern part of the Qinzhou-Hangzhou Metallogenic Belt, China
SO ACTA PETROLOGICA SINICA
AB The nonlinear geochemical data processing methods that are on the basis of fractal or/and multifractal theories, and the advanced techniques for multisource geoinformation integration such as spatially weighted principal component analysis (SWPCA) model have been developed as useful tools for identifying and extracting mineralization associated geochemical anomaly. In this paper, the 1 : 50000 scale of stream sediment geochemical data of Au, Ag, Cu, Pb and Zn, which are considered to be associated with Ag-Au mineralization in Pangxitong district, southern part of Qinzhou-Hangzhou Metallogenic Belt, China, has been taken as a case study to illustrate that how singularity mapping technique and SWPCA method are comprehensively applied to identify and extract mineralization associated geochemical anomaly. Firstly, in order to enhance and extract weak geochemical anomaly, the singularity values of Au, Ag, Cu, Pb and Zn were calculated by sliding window based singularity mapping approach. Furthermore, based on the analysis of geological controlling factors for Ag-Au mineralization in the study area, the mathematical model that utilizes buffing distances of northeastern faults system that has been regarded as one of the most significant ore-controlling factors for estimating spatial weight values in SWPCA has been proposed. Finally, SWPCA was used to integrate the singularity maps of Au, Ag, Cu, Pb and Zn and the compressive geochemical anomaly (i.e. the scores on the first principal component), which could be considered to be as the Ag-Au mineralization associated geochemical anomaly in the study area. The results show that singularity mapping and SWPCA can be powerful tools and successfully used for identifying and extracting Ag-Au mineralization associated geochemical anomaly in Pangxitong district, and it has delineated comprehensive geochemical anomaly targets that probably have high potential to explore new Ag-Au ore deposits.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 779
EP 790
UT WOS:000399303400009
ER  

PT J
AU Qin, XF
Wang, ZQ
Gong, JH
Zhao, GY
Shi, H
Zhan, JY
Wang, Z
AF Qin XiaoFeng
Wang ZongQi
Gong JiangHua
Zhao GuoYing
Shi Hao
Zhan JunYan
Wang Zhen
TI The confirmation of Caledonian intermediate-mafic volcanic rocks in northern margin of Yunkai block: Evidence for Early Paleozoic paleo-ocean basin in southwestern segment of Qinzhou-Hangzhou joint belt
SO ACTA PETROLOGICA SINICA
AB Because the later sedimentary cover and destruction of structure and magma intrusion, the residual paleo-oceanic crusts (ophiolite) were regarded as one of the most important indicators of joint belt that has not been identified in southwestern segment of joint belt between Yangtze and Cathaysia plates (so-called Qinzhou-Hangzhou joint belt), which led to serious differences in the boundary of joint belt, tectonic nature and temporal-spatial evolution and so on. Based on systematic field geological survey reveals that there outcrop a series of (metamorphic) intermediate-mafic volcanic rock blocks along both sides of the Cenxi-Wuzhou fault in Cenxi area, the northern margin of Yunkai block. Geochemical results suggest that these (metamorphic) intermediate-mafic volcanic rocks can be divided into three distinct types:(1) metamorphic intermediate-mafic volcanic rocks from the Camellia tree farm in Nuodong town, which are characterized by slightly depleted in large-ion incompatible elements (LILEs) and LREEs and slightly enrichment in high field strength elements and HREEs with no obvious Nb, Ta, P and Ti negative anomaly. These geochemical features show that these metamorphic intermediate-mafic volcanic rocks are N-MORB type tholeiites typical of those formed in mid-ocean ridge tectonic settings and a plagioclase actinolite rock sample yielded a zircon LA-MC-ICP-MS U-Pb concordia age of 443.7 +/- 2.2Ma; (2) metamorphic mafic volcanic rocks from the Dongwei region in Guiyi town, characterized by slightly enrichment in LILEs and flat-slightly enrichment in LREEs with only slight Nb-Ta, P and Ti depletions, which are analogous to those of E-MORB type tholeiites formed in back-arc basin tectonic settings and a plagioclase amphibolite sample yielded a zircon LA-MC-ICP-MS U-Pb concordia age of 441.3 +/- 2.4Ma; (3) intermediate-mafic volcanic (clastic) rocks from the Baiban-Dashuang region in Anping town, which are characterized by pronounced enrichment in LILEs and LREEs and relatively depletion in HFSEs and HREEs with pronounced Nb-Ta, P and Ti depletion in them. Such signatures display geochemical characteristics of typical subduction-related arc volcanic rocks and an andesitic crystal tuff sample yielded a zircon LA-MC-ICP-MS U-Pb concordia age of 442.2 +/- 3.7Ma. These results imply that there is an Early Paleozoic paleo-ocean basin in southwestern segment of joint belt between Yangtze and Cathaysia plates (Qinzhou-Hangzhou joint belt), and N-MORB, E-MORB and IAB type intermediate-mafic volcanic rocks in the region were most likely generated in a setting associated with this oceanic lithosphere continued southeastward subduction under the Cathaysian (Yunkai) Block during the Caledonian period.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 791
EP 809
UT WOS:000399303400010
ER  

PT J
AU Zhou, D
Long, WG
Ke, XZ
Zhang, LG
Xu, DM
Wang, J
AF Zhou, D.
Long, W. G.
Ke, X. Z.
Zhang, L. G.
Xu, D. M.
Wang, J.
TI Petrogenesis of the tectonic melange on the northern margin of the Yunkai Terrane
SO ACTA PETROLOGICA SINICA
AB Xinyi-Guizi area, in where metabasalts and metasedimentary rocks forming tectonic melange, locates on the northern margin of the Yunkai terrane, South China. Metabasalts which outcrop as tectonite or lentoids, are characterized by moderate Mg-#, high Na, low K, and moderately enriched LREE, no Eu anomaly, high Nb, strongly negative Sr-Nb-Ta anomaly. Nd-143/(144) Nd = 0. 512513 similar to 0. 512655, and epsilon(Nd) ( t) = 2. 89 similar to 4. 90. The tectonic setting identification show that the protolith of metabasalts might erupt in back-arc basin setting. Zircons from two metabasalt samples yield U-Pb age of 1031 +/- 28Ma, 1025 +/- 39Ma. The metasedimentary rocks are mainly composed of schist, metasandstone and quartzite, dominated by characters of terrigenous clastic deposit. Detrital zircons from two quartzite samples yield similar to 1. 0Ga main peak and youngest U-Pb age of 777Ma, 571Ma respectively. It is concluded that the Guizi tectonic melange is the result of tectonic accumulation mixed by Grenville back-arc basin basalts and Late Neoproterozoic terrigenous clastic sediments, and the formation age of tectonic melange may be Ordovician-Silurian.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 810
EP 830
UT WOS:000399303400011
ER  

PT J
AU Li, YK
Cao, JJ
Chen, J
Yi, J
AF Li YingKui
Cao JianJin
Chen Jie
Yi Jie
TI The research of particles carried by ascending gas flow from Qingmingshan Cu-Ni sulfide deposit in Guangxi Province
SO ACTA PETROLOGICA SINICA
AB In order to explore the relationship between particles carried by ascending gas flow and concealed ore bodies, particles carried by ascending gas flow were collected in the soil above Qingmingshan Cu-Ni sulfide deposit in Guangxi Province. The morphology, size, aggregation, chemical component and structure were analyzed by using transmission electron microscopy (TEM). The results reveal that particles are mainly composed of Cu, Co, Zn, Fe, Ca, Si and S, the ore-forming elements like Cu and Co may be in the form of natural Cu-Fe-Co, Zn-Fe-Co and Fe-Co alloy, the others like Fe, Ca, Si and S are mainly in the form of hydroxide, oxide and carbonate. Particles can be divided into particle aggregations and individual particles, and sizes of particles range from 50nm to 500nm. The shapes of particles are irregular, nearly elliptical, nearly spherical, drop-shaped and nearly rectangle. The detection of Cu, Co, Zn-bearing particles with high element content shows that Cu, Co and Zn in particles are relevant to deep concealed ore body. Fe, S-bearing particles may come from metal sulfide minerals in the deposit. In addition, particles components with high valence state indicate that particles exist under the oxidation conditions. Particles carried by ascending gas flow in Qingmingshan Cu-Ni sulfide deposit have a good correspondence with mineral component in the mine area, and this research may provide a new prospecting method for concealed Cu-Ni sulfide deposits.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 831
EP 842
UT WOS:000399303400012
ER  

PT J
AU Zheng, W
Ouyang, HG
Zhao, HJ
Zhao, CS
Yu, XF
Luo, DL
Huang, HG
Ouyang, ZX
AF Zheng Wei
Ouyang Hegen
Zhao Haijie
Zhao CaiSheng
Yu XiaoFei
Luo Dalue
Huagu, Huang
ZhiXia, Ouyang
TI Re-Os dating for the molybdenite from the Xiping Mo-Cu polymetallic deposit in Guangdong Province and its geological significance
SO ACTA PETROLOGICA SINICA
AB The Xiping Mo-Cu polymetallic deposit is a large porphyry deposit located in the southwestern of the Qin-Hang metallogenic belt. Four molybdenite samples from the Xiping Mo-Cu polymetallic deposit were collected to perform the Re-Os dating. The Re-Os dating yield model ages ranging from 85. 15Ma to 88. 34Ma, with a weighted mean age of 86. 1 +/- 2. 3Ma, and obtain an isochron age of 89. 9 +/- 3. 4Ma. Evidently, model ages are consistent with isochron age within the error ranges, so we can constrain the ore-forming age of Xiping Mo-Cu polymetallic deposit at the Late Cretaceous. The molybdenites from the Xiping deposit have a very low content of Re, probably showing a crustal source for the ore-forming materials. The granitic magmatism and mineralization in the Qin-Hang metallogenic belt occur mainly in the Mesozoic, especially Yanshanian-aged, and can be divided into two groups: The first group in the Mid-Late Jurassic (180 similar to 150Ma), and the second group in the Cretaceous (110 similar to 80Ma). Combining the tectonic geological evolution, it is proposed that the large-scale magmatism and mineralization in the two stages is probably related to subduction of the Pacific plate. The Xiping Mo-Cu polymetallic deposit formed in the Late Yanshanian lithospheric extensional and thinning environment.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 843
EP 858
UT WOS:000399303400013
ER  

PT J
AU Xiao, X
Zhou, TF
Yuan, F
Fan, Y
Zhang, DY
Liu, DZ
Huang, WP
Chen, XF
AF Xiao Xin
Zhou TaoFa
Yuan Feng
Fan Yu
Zhang Dayu
Liu DongZhou
Huang WeiPing
Chen XueFeng
TI The geochronology of the Qingyang Gaojiabang tungsten-molybdenum deposit and its geological significance
SO ACTA PETROLOGICA SINICA
AB The Gaojiabang tungsten deposit is the largest stratabound skarn tungsten-molybdenum deposit located in Anhui Province, which is hosted in the north-east connect zone of Qingyang-Jiuhua complex batholith. On the basis of geological and petrographic studies, we collect the primary types of magmatic rocks (granodiorite and fine crystalline granodiorite), LA- ICP-MS zircon U-Pb data show that the age of the magmatic rocks is 144. 9 +/- 1. 2Ma and 145 +/- 2Ma. We have conducted molybdenite Re-Os to precisely constrain the timing of mineralization in the deposit. The results show that the mineralization occurred at 146. 1 +/- 4. 8Ma. There are two events of ore-forming periods in south of Anhui are obtained: 146 similar to 136Ma and 134 similar to 128Ma, respectively formed in the compression extension tectonic conversion and lithosphere rapid delamination thinning tectonic setting. By comparing with Qinhang Metallogenic Belt, we find the tungsten deposit the south of Anhui formed in the Yanshanian epoch, but the same deposit in Qinhang Metallogenic Belt formed in different stage. The granite magmatic rocks also development in the south Anhui, which is similar to Qinhang metallogenic belt. However, so far the tungsten-molybdenum deposit found in the south of Anhui are closely related with the granodrite, only a small amount of tungsten-molybdenum deposit associate with the highly evolved granites. At the same time, the tin ore prospecting has been found in this area indicates that the south of Anhui has the potential to search of tungsten molybdenum deposit and tin deposit, which is related with the highly evolved granites.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 859
EP 872
UT WOS:000399303400014
ER  

PT J
AU Xuan, YS
Yuan, SD
Mi, JR
Zhao, PL
Yuan, YB
Zhang, DL
AF Xuan Yisa
Yuan ShunDa
Mi Jiaru
Zhao PanLao
Yuan Yabin
Zhang DongLiang
TI Preliminary studies on the fluid inclusions and H-O isotopic geochemistry of the Baoshan copper polymetallic deposit
SO ACTA PETROLOGICA SINICA
AB The Baoshan deposit is the largest Cu deposit in southern Hunan Province, which is located on the connection part of Qin-Hang NE-trending ore belt and Nanling EW-trending polymetallic metallogenic belt. The Cu-polymetallic mineralization is associated with granodiorite porphyry. Copper-molybdenum ore bodies occur as disseminated ore in skarn between granodiorite porphyry and carbonate rocks, while lead-zinc sulfide ores occur as veins in the fault damage zone and within intrastratal fracture belts of the Carboniferous strata. Based on detailed field investigation of the Baoshan copper polymetallic deposit, we have carried out systematic microscope observation, detailed micro-thermometric measurement of the fluid inclusions, Laser Raman spectroscopic and H-O isotopic analyses, and preliminarily discussed the fluid evolution of the deposit. The following conclusions are obtained: (1) The mineralization of the Baoshan deposit can be divided into four stages, i.e., the skarn stage, retrograde stage, metal sulfides stage and fluorite-calcite stage; (2) The main types of fluid inclusions for Baoshan deposit are liquid-rich inclusions. The ore-forming fluid of Baoshan deposit belongs to H2O-NaCl system. There is a little CO2 in the gas phase and a few NaCl daughter minerals in the fluid inclusions; (3) The homogenization temperatures of the fluid inclusions range from 430 degrees C to >550 degrees C (mainly above 550 degrees C) and the salinities are between 13.4 parts per thousand and 21. 98 parts per thousand NaCleqv in the skarn stage. The homogenization temperatures of the fluid inclusions range from 211. 8 degrees C to 395 degrees C (mainly 260 similar to 320 degrees C and 360 similar to 395 degrees C) and the salinities range from 3. 71 parts per thousand to 19. 53 parts per thousand NaCleqv in the retrograde stage. The dramatic decrease in pressure from skarn stage to retrograde stage can be probably attributed in the transition from lithostatic pressure to hydrostatic pressure. In metal sulfides stage, the homogenization temperatures range from 156. 7 degrees C to 323. 1 degrees C (mainly 190 similar to 240 degrees C) and the salinities range from 3. 71 parts per thousand to 19. 84 parts per thousand NaCleqv. In fluorite-calcite stage, the homogenization temperatures are between 100 degrees C and 266. 5 degrees C (concentrated in 145 similar to 180 degrees C) and the salinities are 3. 71 parts per thousand similar to 19. 84 parts per thousand NaCleqv. The trapping pressure can be estimated to be about 23. 8 similar to 169. 9MPa which changed from lithostatic pressure to hydrostatic pressure, equivalent to a depth of 2. 25 similar to 6. 29km which is centered in 4 similar to 6km; (4) The delta O-18(H2O) values of the retrograde stage ore fluids which range from 3. 37 parts per thousand to 7. 47 parts per thousand, are corresponding delta D-H2O values between- 64 parts per thousand and -70 parts per thousand. The delta O-18(H2O) values of metal sulfides stage and fluorite-calcite stage fluid are from 0. 33 parts per thousand to 5. 28 parts per thousand, implying a significant input of meteoric water. In general, the ore-forming fluid system varies from early, deep, magmatic fluid to late, shallow, meteoric water. Thus the ore-forming fluid was mainly magmatic water in the early stage, with progressive mixing with proportionally more cooler meteoric water during the process of fluid evolution. The mixing of high and low temperature fluids maybe the main mechanism for copper polymetallic precipitation.
The copper polymetallic mineralization in Baoshan deposit is related to the fluids from early high-temperature, high salinity to late low-temperature, low salinity.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 873
EP 886
UT WOS:000399303400015
ER  

PT J
AU Zhang, JH
Chen, Z
Chen, GN
Ding, RX
Peng, ZL
AF Zhang JunHao
Chen Zhen
Chen GuoNeng
Ding Ruxin
Peng ZhuoLun
TI Studies of formation temperature of Caledonian migmatite-granite at the Fuhuling area of the southern Qinzhou-Hangzhou zone
SO ACTA PETROLOGICA SINICA
AB Caledonian migmatite and migmatitic granite are widely distributed in the southern Qinzhou-Hangzhou junction-zone of South China. Determination of formation temperature of the migmatite-migmatitic granite is important for the understanding of thermodynamic condition and magma generation within the crust of South China during Caledonian Orogeny. The Fuhuling Profile that is a cliff by shoreside located at the most south of the Qinzhou-Hangzhou zone crops out different-typed migmatite and migmatitic granite zoned from top of the profile downwards in the order of spotted migmatite, linear migmatite, ribbon migmatite, banded migmatite and migmatitic granite (dirty granite). Authors of this paper make image-sampling of the various rocks of profile with camera in the field. The sampling and specimen-treating methods are as follows: fixing a 30 x 30cm(2) square frame on the outcrop of each-typed rocks, taking photo of the rock within the square frame, converting the images into black and white in computer under the same threshold value, and calculating the percentage of the white part that is considered representing the leucosome (melt) of migmatite. Projecting the melting ratios of different-typed rocks obtained with the above methods to the graph plotted with the experimental results of rock (greywacke) -melting by Winkler and von Platen (1961), both of them show in good agreement. Comparing the temperature given by the graph and the rock-types of Fuhuling profile, we can find that formation temperature of the migmatites in the profile is between 630 degrees C and 705 degrees C (at which the dirty magma is formed), and the embedded depth of the profile is about 7km under surface during the melting process. This composite graph mentioned above can be regarded as a 'melting-thermometer' that supplies a new method for determination of formation temperature of migmatite and can be used not only in Fuhuling but also in other places.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 887
EP 895
UT WOS:000399303400016
ER  

PT J
AU Ye, M
Zhao, H
Zhao, M
Shu, X
Zhang, RX
Yang, SY
AF Ye Mao
Zhao He
Zhao Mian
Shu Xun
Zhang RuoXi
Yang ShuiYuan
TI Mineral chemistry of biotite and its petrogenesis implication in Lingshan granite pluton
SO ACTA PETROLOGICA SINICA
AB The Lingshan composite granite pluton is composed of an outer zone of biotite granite, and a central part of amphibolebiotite granite which contains many mafic microgranular enclaves (MME). Biotite is an important ferromagnesian mineral in most of intermediate-felsic igneous rocks, and its mineral chemistry data can record the properties of magma and the petrogenetic physicochemical conditions. In this study, we carried out a detailed petrographic study together with electric micro-probe analysis on biotites for the biotite granite, the amphibole-biotite granite and the MME, to discuss the source, physicochemical conditions, and the magma mingling/mixing processes in the Lingshan composite granite pluton. The results show significantly different chemical compositions for biotites from the biotite granite and the amphibole-biotite granite, while chemical compositions of biotites in the MME are variable. The crystallization of these biotites was all in a low oxygen fugacity. The biotites in amphibole-biotite granite and biotite granite are both rich in Fe, poor in Mg, and belong to ferri-biotite. The ratio of (Fe3+ + Fe2+) /(Fe3+ + Fe2+ Mg2+) are 0. 65 similar to 0. 70 and 0. 72 similar to 0. 78, respectively. The ratios of FeOT/MgO of biotites in both granites are close to 7. 04. The MF values [2 x Mg/(Fe2+ + Mg + Mn) ] are 0. 64 to 0. 76 for biotite from the amphibole-biotite granite, 0. 48 to 0. 60 for the biotite from the biotite granite, suggesting these tow granites are both derived from crustal source rocks. The biotites in MME vary from ferri-biotite to magnesio-biotite, and their MF values range between 0. 63 and 1. 06, which imply that magma of MME experienced magma mixing/mingling in various degrees. Amphibole-biotite granite and parts of MME have a similar crystallization condition, while other MME are obviously different with amphibole-biotite granite. The contrast between amphibole-biotite granite and MME may be a consequence of continuous and multistage interaction between felsic and mafic magmas.
RI
Yang, Shui-Yuan  F-6241-2016 
OI
Yang, Shui-Yuan  0000-0003-3594-8865  
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 896
EP 906
UT WOS:000399303400017
ER  

PT J
AU Sun, KK
Chen, B
Chen, JS
Xiang, XK
AF Sun Keke
Chen Bin
Chen JunSheng
Xiang XinKui
TI The petrogenesis of the Jiuling granodiorite from the Dahutang deposit, Jiangxi Province and its tectonic implications
SO ACTA PETROLOGICA SINICA
AB There are a series of Neoproterozoic granitoids developed in eastern segment of the Jiangnan orogen, the Jiuling batholith is the largest. Zircon U-Pb dating yields an age of 819Ma for the Jiuling granodiorite. The Jiuling granodiorite exposed in Dahutang deposit contains a lot of biotite-rich magmatic microgranular enclaves (MMEs). The MMEs have classical igneous petrographic textures with abundant acicular apatites. The granodiorite and MMEs have high Mg-# values (42 similar to 50), which are high than that of experimental melts from basaltic rocks (mostly Mg-# <40). MMEs are rich in MgO, CaO, Fe2O3T, TiO2, Ni, Co, Sc and V. The MMEs have higher epsilon(Nd) (t) ( -3. 4 similar to -2. 1) than that of granodiorite ( -4. 0 similar to -3. 5). The zircon of granodiorite have epsilon(Hf) (t) ( - 1. 4 similar to 6.4) and majority of them exhibit positive values. Nd, Hf isotopic results are consistent with the Shuangqiaoshan Group, which means Shuangqiaoshan Group is an important resource for Jiuling granodiorite. The present of MMEs indicate Jiuling granodiorite were derived from mixing of siliceous crustal melts and basaltic magma. Biotite-rich enclaves are not the residual phases after part melting. We suggest biotite-rich enclaves were formed from the interaction of basalt magma with the K-rich lower crust. Combing with metamorphic rocks, stratigraphy and mafic rocks in the area, we infer that the collision of Yangtze and Cathaysia blocks occurred around 825 Ma. Jiuling granodiorite was formed after the collision of Yangtze block and Cathysia block. It resulted from mixing of felsic melts and basaltic melts.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 907
EP 924
UT WOS:000399303400018
ER  

PT J
AU Yu, WJ
Luo, ZH
Liu, YS
Sun, JY
Li, Z
Wang, Z
Tang, ZX
AF Yu Wenjia
Luo ZhaoHua
Liu YongShun
Sun JunYi
Li Zhong
Wang Zheng
Tang Zexun
TI Petrogenesis of the Lala iron-copper deposit: Evidence by cryptoexplosive breccia CSD data and their zircon U-Pb data
SO ACTA PETROLOGICA SINICA
AB Lala iron-copper deposit, one of the largest deposits in SW China, is hosted in the Late Paleoproterozoic of lower strata of the Hekou Group. However, the petrogenesis and the type of the deposit is still lack of significant evidence. Recently, it is continuously proved that Lala deposit is Iron Oxide Copper-Gold (IOCG) deposit in contrast to the classical opinions that it is attributed to submarine volcanic sedimentary exhalative processes, but few detailed reports of the cryptoexplosive breccia. In this article, we used the example of Xiaolutian pit and studied on the basis of geology and petrography of the crytoexplosive breccia and their wallrocks. With the application of Quantitative Textural Analysis theories and methods, and the LA-ICP-MS zircon U-Pb age, we attempt to interpret the genesis and types of the Lala iron-copper-gold deposit. Fractal dimension of the breccia illustrates the cause of its mechanical fragmentation in comparison with fault breccia. The spatial density of population reveals that it is mechanically compressed and can be distinguished from the fault breccia in the alignment factor and roundness data. Petrographic showed that minerals in the rock have obvious orientation, the magnetite vein intruded into the schistosity or weak zone and the chalcopyrite occurred in breccia cements. This explained the wallrocks have undergone constructed shear deformation before mineralization. So the age of the wallrocks can' t representative the age of mineralization. It was the fluid rich in iron or copper that added into the fluid reservoir, which resulted fluid overpressure internally, then caused crytoexplosion. After that, fluid in the lower part intruded into the weak zone of strata, which forms the main hosts of the ores. The spilite, keratophyre and crytoexplosive breccia where infilled by hydrothermal minerals derived from the upper fluid. The process was like the transmagmatic fluid model. Experiments data yielded an age of 1720 +/- 11Ma of spilitekeratophyre formation. Zircon crystals of crytoexplosive breccia showed significant characteristics of late hydrothermal alteration, nevertheless, it still deny the theory of submarine volcanic sedimentary mineralizion. The discovery of crytoexplosive breccia provides an important basis for which Lala deposit is IOCG deposit.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 925
EP 941
UT WOS:000399303400019
ER  

PT J
AU Lu, DY
Ye, HS
Cao, J
Qi, LZ
Wang, P
Chao, WW
AF Lu DongYu
Ye HuiShou
Cao Jing
Qi LianZhong
Wang Peng
Chao WeiWei
TI LA-ICP-MS zircon U-Pb ages, Hf isotopic compositions, geochemistry characteristics and its geological significance of Jiangligou composite granite
SO ACTA PETROLOGICA SINICA
AB The Paleo-Tethys Ocean closed along Mianlue Suture in Triassic marked the final closing between North China Block (NCB) and Yangtze Block (YZB) In the western part of Qinling ( named "West Qinling" for short), numerous of Indosinian granitiod caused by the strong tectonic-magmatic activity also generated a lot of mineralization in the area. These Indosinian-granites as a probe of their research will help to understand the structure and dynamics in the context of the period. The Jiangligou composite granite, occurred in the north of West Qinling, can be divided into three facies, and was carried out for LA-ICP-MS zircon U-Pb zircon dating, zircon Hf isotope test, the major and trace elements test. The zircon U-Pb dating results show the weighted average age of porphyritic biotite monzonite granite, granite porphyry and fine-grained granite were: 229. 1 +/- 1. 8Ma (MSWD = 0. 82), 222. 5 +/- 1. 4Ma ( MSWD = 0. 41) and 217. 1 +/- 1. 8Ma ( MSWD =1. 4), which indicated Jiangligou composite granite (JCG) was formed in the late middle-late Triassic. Geochemical data shows that: JCG have the features of high silicon (SiO2 = 72. 67% similar to 77. 84%), alkali-rich (K2O + Na2O = 7. 67% similar to 8. 75%), weakly peraluminous (A/CNK =1. 01 similar to 1. 06), high degree of differentiation ( rock from early to late DI and Rb/Sr were increased, DI = 88.9 similar to 95. 36, Rb/Sr = 1.76 similar to 12. 19), enriched in Rb, Th, U, Ta, Zr, Hf and HREE element, depleted in Ba, Sr, P, Ti and other elements, significant negative Eu anomalies (delta Eu = 0. 54 similar to 0. 62, 0. 26 similar to 0. 47, 0. 20 similar to 0. 60). The P2O5 has the negative correlation with SiO2 while the Y has the positive correlation with the Rb. In summary, JCG shows characteristics of highly fractional I-type granite. Rock formation temperature decreased from early to late ( average from 786 degrees C to 755 degrees C). epsilon(Hf) (t) values of the majority is between 0. 1 similar to 4. 8, except a small number of <0, with the corresponding t(DM2) range from 0.95 to 1. 25Ga. Comprehensive inferred that the JCG result from extensive fractionation of hybrid magma, which combined the Proterozoic crust derived melts and lithospheric mantle derived melts.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 942
EP 962
UT WOS:000399303400020
ER  

PT J
AU Li, C
Chen, B
Li, Z
Yang, C
AF Li Chao
Chen Bin
Li Zhuang
Yang Chuang
TI Petrologic and geochemical characteristics of Paleoproterozoic monzogranitic gneisses from Xiuyan-Kuandian area in Liaodong Peninsula and their tectonic implications
SO ACTA PETROLOGICA SINICA
AB As the northern segment of Jiao-Liao-Ji Belt of North China Craton, the Liaoji region preserves good exposure of Paleoproterozoic sedimentation and magmatism. In this contribution, we conducted petrologic, geochemical and petrogenesis study on two Paleoproterozoic monzogranitic gneisses (Jiguanshan pluton and Laoheishan pluton) in the Liaoji region. The study shows that the monzogranites have relatively higher K2O/Na2O, FeOT/MgO ratios and Ga, Zr, Y contents, while low contents of CaO, MgO, Sr, Cr, Co and Ni. Concentration of the total alkali (K2O + Na2O) is 7.97% similar to 9.08%. In the diagram of SiO2-K2O, monzogranites mainly lie in the high-K calc-alkaline series. A/CNK values of the monzogranites are 0.84 similar to 1.03, while their A/NK values are 1.11 similar to 1.17. 10000Ga/A1 values of all the samples are higher than 2.6, thus, these monzogranites are classified as aluminous A-type granites with high-K calc-alkaline affinity. E-Nd(t) values of six samples from the monzogranites are -3.3 similar to -0.9, corresponding to t(Dm2) of 2860 2669Ma. Thus, the monzogranites originated from partial melting of Archean crust. The monzogranites are characterized by enrichment in large ion lithophile elements (such as Rb, U, K) and light rare earth elements, and depletion in high field strength elements (such as Nb, Ta, Ti), showing evident signature of subduction-zone magmatism. The monzogranites plot in the region of volcanic arc in the Rb/30-Hf-Ta x 3 diagram. In the diagrams of Y/Nb-Rb/Nb and Nb-Y-Ce, the monzogranites are located in the region of A(2)-type granites due to theirs relatively higher Y than Nb, which is similar to island-arc basalts in terms of Y/Nb ratios. The Liaoji region was a continental back-arc basin in the Early Paleoproterozoic, and strong extension generated the monzogranites in this back-arc basin. The monzogranites were later deformed and pushed together with their surrounding rocks in later processes of terrane amalgamation.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 963
EP 977
UT WOS:000399303400021
ER  

PT J
AU Zheng, GG
Liu, XC
Zhao, Y
Wang, W
Chen, LY
AF Zheng GuangGao
Liu XiaoChun
Zhao Yue
Wang Wei
Chen LongYao
TI Mid-Cretaceous volcano-magmatism in the Curverville Island of the Antarctic Peninsula and its tectonic significance: Constraints from zircon U-Pb geochronology and Hf isotopic compositions
SO ACTA PETROLOGICA SINICA
AB The Antarctic Peninsula, located in the western margin of Gondwana for a long time, was the final place of the Gondwana dispersion. Voluminous Mesozoic-Cenozoic igneous rocks occur in the Antarctic Peninsula, and the magmatic process, source characteristics and geodynamic setting of these rocks remain controversial. This has led to the argument for the tectonic evolution of the Antarctic Peninsula This paper reports zircon LA-MC-ICP-MS U-Pb dating and Hf isotopes of the andesitic volcanic rock, diorite porphyrite vein and diorite xenolith from the Curverville Island in the central domain of the Antarctic Peninsula. The results show that the zircon U-Pb ages are 103.3 +/- 1.7Ma for andesitic breccia lava, 101.9 +/- 1.8Ma for andesitic breccia, 92.0 +/- 1.2Ma for medium grained diorite xenolith, and 85.7 +/- 07Ma for diorite porphyrite vein. This suggests that there existed three episodes of volcanism in the Mid-Cretaceous, with the first episode of intensive volcanic eruption at ca. 102Ma, the second episode of diorite intrusion at ca. 92Ma, and the third episode of diorite porphyrite intrusion at ca. 86 Ma. The in-stiu zircon Hf isotopic analysis indicates that most epsilon(Hf) (t) values are +2.5 similar to +7.9, with an average value of +4.4. Their Hf model ages ranging from 505 Ma to 678 Ma, suggesting that the Mid-Cretaceous igneous rocks may have been derived from the partial melting of depleted mantle materials of the Neoproterozoic-Cambrian age. Coupled with the available published data, we propose that the igneous rocks from the Curverille Island formed in an island arc setting, which accompanies with the process of the Gondwana breakup. Therefore, the igneous rocks from the Curverille Island are one of the main lithology that makes up the central magmatic domain of the Antarctic Peninsula.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 978
EP 992
UT WOS:000399303400022
ER  

PT J
AU Wang, JR
Chen, WF
Zhang, Q
Jiao, ST
Yang, J
Pan, ZJ
Wang, SH
AF Wang JinRong
Chen WanFeng
Zhang Qi
Jiao ShouTao
Yang Jing
Pan ZhenJie
ShuHua, Wang
TI Preliminary research on data mining of N-MORB and E-MORB: Discussion on method of the basalt discrimination diagrams and the character of MORB' s mantle source
SO ACTA PETROLOGICA SINICA
AB MORB can be divided into N-MORB and E-MORB, N-MORB is LREE depleted and E-MORB is enriched. Studies on MORB have greatly boosted the fundamental theories of basalts. N-MORB and OIB are generally believed to be two separate end members, and E-MORB is mixed by N-MORB and OIB in varying degrees. The diagrams for discriminating tectonic settings of basalts were established during the 1970s and 1980s, which are tremendous progress for analyzing earth dynamics and tectonic background of basalts and has thrived for decades especially in China. We have compiled more than 50000 MORB data in PetDB database for tectonic setting discrimination diagrams. The plotting diagrams applying whole samples exhibit more accurate and reliable results than that of using representative samples. Therefore, previous discrimination diagrams of major and trace elements require reexamination. Our study indicates that MORB can be either LREE depleted or enriched, and the degree of depletion or enrichment is in large difference from previous definition, which reflect that the mantle beneath ocean ridge is more heterogeneous in composition than previous understanding. In general, our study provides new, different insights to basalts, and we propose multi-dimension, high-confidence level discrimination system to be established for more research on the origin of magmas.
SN 1000-0569
EI 2095-8927
PY 2017
VL 33
IS 3
BP 993
EP 1005
UT WOS:000399303400023
ER  

EF  

黔ICP备07002071号-2
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
单位地址:北京9825信箱/北京朝阳区北土城西路19号
本系统由北京勤云科技发展有限公司设计

手机扫一扫