| 云南兰坪盆地西缘脉状铜多金属矿床硫、铅同位素组成及成矿示踪 |
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| 引用本文： | 张锦让,温汉捷.云南兰坪盆地西缘脉状铜多金属矿床硫、铅同位素组成及成矿示踪[J].地球化学,2012(2):166-180. |
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| 作者姓名： | 张锦让 温汉捷 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002
2. 中国科学院研究生院,北京100049 |
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| 基金项目： | 国家重点基础研究发展计划(2009CB421005);中国科学院知识创新工程重要方向项目(KZCX2-YW-Q04-01) |
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| 摘 要： | 云南兰坪盆地西缘脉状铜多金属矿床主要赋存于由砂岩、粉砂岩和页岩组成的碎屑岩建造中.为了查明兰坪盆地西缘脉状铜多金属矿床成矿物质来源,对盆地西缘四个典型脉状铜多金属矿床(科登涧、连城、金满和水泄)的硫、铅同位素的组成进行了分析和对比研究.结果表明,这些矿床的铅同位素组成总体变化较小,且大部分落在盆地沉积地层铅范围内,金满、连城铜矿床可能有部分深源铅的加入.硫同位素特征表明,兰坪盆地西缘脉状铜多金属矿床的硫主要来源于地层硫酸盐的还原作用,其中金满铜矿床和连城铜钼多金属矿床可能有深源硫的混入.各矿床硫同位素不同的特点,除反映各矿床源区硫同位素组成的差异外,可能还与各矿床成矿时不同的物理化学条件(温度、氧逸度、pH 值和离子强度等)差异有关
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| 关 键 词： | 硫同位素 铅同位素 脉状铜多金属矿床 兰坪盆地 云南省 |
Sulfur and lead isotope compositions and tracing of copper deposits on the western border of the Lanping Basin,Yunnan Province |
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| ZHANG Jin-rang,and WEN Han-jie.Sulfur and lead isotope compositions and tracing of copper deposits on the western border of the Lanping Basin,Yunnan Province[J].Geochimica,2012(2):166-180. |
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| Authors: | ZHANG Jin-rang and WEN Han-jie |
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| Institution: | 1.State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | A large number of vein-type Cu-polymetallic deposits were developed on the western border of the Lanping Basin in western Yunnan Province,which constituted an important Cu-polymetallic mineralization belt.These deposits are hosted in clastic rocks(sandstone,siltite and argillite) of Mesozoic and Cenozoic formation.In order to trace source of ore-forming materials of these deposits,four representative deposits(Jinman,Shuixie,Kedengjian and Liancheng) were selected to analyze sulfur and lead isotopic compositions.Pb isotopic compositions show very narrow variations and mostly fall within the range of the sedimentary rock lead,suggesting that lead in these vein-type Cu-polymetallic deposits is mostly derived from the basement of the basin.However,the Jinman and Liancheng deposits may have deep sources of lead with different Pb isotopic composition.Sulfur isotope analysis show that the reduced sulfur of these vein-type Cu-polymetallic deposits mainly come from the strata sulfate.However,like Pb isotopes,the Jinman and Liancheng deposits have more complicated S isotopic compositions,implying additional deep S source.In all,the variations of sulfur isotopic compositions in each individual deposit reflect difference of their sulfur source as well as evolution of their physical-chemical conditions of the ore-forming fluids(temperature,oxygen fugacity,pH,ionic strength,etc.). |
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| Keywords: | sulfur isotope lead isotope vein-type Cu-polymetallic deposit Lanping Basin Yunnan Province |
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