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Mineralization Styles and Genesis of the Yinkeng Au-Ag-Pb-Zn-Cu-Mn Polymetallic orefield, Southern Jiangxi Province, SE China: Evidence from geology, Fluid Inclusions, Isotopes and Chronology

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Acta Geologica Sinica(English Edition) 2014年第3期88卷 825-844页

作者： FENG Chengyou LI Daxin ZENG Zailin ZHANG Dequan SHE Hongquan Key Laboratory of Metallogeny and Mineral Resource Assessment Ministry of Land and Resources Institute of Mineral Resources CAGS South Jiangxi Geological Survey Party of JBGMR

The Yinkeng orefield in Yudu County,Jiangxi Province,SE China,is a zone of concentrated Au-Ag-Pb-Zn-Cu-Mn polymetallic *** on summing up basic geology and ore geology of the orefieid,the polymetallic deposits in the orefield have been divided into seven major substyles according to their occurring positions and control *** ore-forming fluid inclusion styles in the orefield include those of two-phase fluid,liquid CO2-bearing three-phase and daughter mineral-bearing *** homogenization temperatures range from 382° to 122℃,falling into five clusters of 370° to 390°,300° to 360°,230° to 300°,210° to 290° and 120° to 200°,and the clusters of 300° to 360°,230° to 300° and 120° to 200° are three major mineralization stages,with fluid salinity peaks from 4.14% to 7.31%,2.07% to 7.31% and 0.53% to 3.90%,*** ore-forming fluids are mainly type of NaCl-H2O with medium to high density （0.74-1.02 g/cm3）,or CO2-bearing NaCl-H2O with medium to low density （0.18-0.79 g/cm3）.The fluid salinity and density both show a decline tendency with decreasing *** to the measurement and calculation of Hand O-isotopic compositions in the quartz of the quartz-sulfide veins,δDV-SMOW of the ore-forming fluid is from-84‰ to-54‰,and δ18OV-SMOW of that is from 6.75‰ to 9.21‰,indicating a magmatic *** δ34SV-CDT of sulfides in the ores fall into two groups,one is from-4.4‰ to 2.2‰ with average of-1.42‰,and the other from 18.8‰ to 21.6‰ with average of 19.8‰.The S-isotopic data shows one peak at-4.4‰ to 2.2‰ （meaning-1.42‰） suggesting a simple magmatic sulfur *** ore Pbisotopic ratios are 206pb/204pb from 17.817 to 17.983,207pb/204pb from 15.470 to 15.620 and 208pb/204pb from 38.072 to 38.481,indicating characteristics of mantle-derived *** data show that the major ore deposits in the orefield have a magmatic-hydrothermal genesis and that the SHRIMP zircon age of the granodiorite porphyry,closely related to the mineralization,is 1

关键词： ore geology geochemistry fluid inclusion SHRIMP zircon U-Pb dating ore genesis,Carboniferous Jiangxi Province

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Giant Mineral Deposits and Their Geodynamic Setting in the Lanping Basin, Yunnan, China

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Acta Geologica Sinica(English Edition) 2004年第2期78卷 368-374页

作者： XUEChunji LIUShuwen CHENYuchuan ZENGRong ZHAOShihua CollegeofEarthSciencesandResources Chang＇anUniversityXi＇anShaanxi710054 ChineseAcademyofGeologicalSciences Beijing100037 CollegeofEarthSciencesandResources Chang＇anUniversityXi＇anShaanxi710054

There are giant mineral deposits, including the Jinding Zn-Pb and Baiyangping Ag-Co-Cu, and otherimportant mineral deposits (e.g., Baiyangchang Ag-Cu, Jinman Cu deposits, etc.) in the Lanping Mesozoic-Cenozoic Basin, Yunnan Province, China. The tabular ore-bodies and some veins hosted in terrestrial clastic rocks of the Mesozoic-Cenozoic age and no outcropping of igneous rocks in the giant deposits lead to the proposal of syngenetic origin, but the giant mineral deposits are not stratabound (e.g. MVT, sandstone- and Sedex-type). They formed in a continental red basin with intense crust movement. The mineralization is controlled by structures and lithology and occurs in different strata, and no sedimentary nature and no exhalative sediments are identified in the deposits. The deposits show some relations with organic matter (now asphalt and petroleum) and evaporates (gypsum). The middle-low-temperature (mainly 110℃ to 280℃) mineralization took place at a depth of about 0.9 km to 3.1 km during the early Himalayan (58 to 67 Ma). The salinity of ore-forming fluids is surprisingly low (1.6% to 18.0 wt% (NaCl)eq). Affected by the collision of the Indian and Eurasian plates, the mantle is disturbed under the Lanping Basin. The large-scale mineralization is closely linked with the geodynamics of the crust movement, the mantle and mantle-flux upwelling and igneous activity. Giant mineral deposits and their geodynamic setting are unique in the Lanping Basin.

关键词： giant Jinding Zn-Pb deposit giant Baiyangping Ag-Co-Cu deposit ore geology geodynamic setting Lanping Basin Yunnan Province China

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Giant Mineral Deposits and Their Geodynamic Setting in the Lanping Basin,Yunnan,China

Giant Mineral Deposits and Their Geodynamic Setting in the L...

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中国科学院地质与地球物理研究所2004学术年会

作者： XUE Chunji~1,LIU Shuwen~1,CHEN Yuchuan~2,ZENG Rong~1 and ZHAO Shihua~1 1 College of Earth Sciences and Resources,Chang’an University,Xi’an,Shaanxi 710054 2 Chinese Academy of Geological Sciences,Beijing 100037

There are giant mineral deposits,including the Jinding Zn-Pb and Baiyangping Ag-Co-Cu,and other important mineral deposits(e.g.,Baiyangchang Ag-Cu,Jinman Cu deposits,etc.) in the Lanping Mesozoic-Cenozoic Basin,Yunnan Province,*** tabular ore-bodies and some veins hosted in terrestrial clastic rocks of the Mesozoic-Cenozoic age and no outcropping of igneous rocks in the giant deposits lead to the proposal of syngenetic origin,but the giant mineral deposits are not stratabound(***,sandstone- and Sedex-type).They formed in a continental red basin with intense crust *** mineralization is controlled by structures and lithology and occurs in different strata, and no sedimentary nature and no exhalative sediments are identified in the *** deposits show some relations with organic matter(now asphalt and petroleum) and evaporates(gypsum).The middle-low-temperature(mainly 110℃to 280℃) mineralization took place at a depth of about 0.9 km to 3.1 km during the early Himalayan(58 to 67 Ma).The salinity of ore-forming fluids is surprisingly low(1.6%to 18.0 wt%(NaCl)).Affected by the collision of the Indian and Eurasian plates,the mantle is disturbed under the Lanping *** large-scale mineralization is closely linked with the geodynamics of the crust movement,the mantle and mantle-flux upwelling and igneous *** mineral deposits and their geodynamic setting are unique in the Lanping Basin.

关键词： giant Jinding Zn-Pb deposit giant Baiyangping Ag-Co-Cu deposit ore geology geodynamic setting Lanping Basin Yunnan Province China

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