湘西花垣矿集区柔先山铅锌矿床的成矿时间和物质来源
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  • 英文篇名:Geochronology and Ore-Forming Material Source Constraints for Rouxianshan Pb-Zn Deposit in Huayuan Ore Concentration Area,Western Hunan
  • 作者:谭娟娟 ; 刘重芃 ; 杨红梅 ; 蔡应雄 ; 卢山松
  • 英文作者:Tan Juanjuan;Liu Chongpeng;Yang Hongmei;Cai Yingxiong;Lu Shansong;Wuhan Center of China Geological Survey;
  • 关键词:花垣矿集区 ; 柔先山矿床 ; 铅锌矿床 ; 闪锌矿Rb-Sr等时线 ; 同位素 ; 成矿流体 ; 地球化学
  • 英文关键词:Huayuan ore-concentration area;;Rouxianshan ore;;Pb-Zn deposit;;sphalerite Rb-Sr isochron line;;isotope;;ore-forming fluid;;geochemistry
  • 中文刊名:DQKX
  • 英文刊名:Earth Science
  • 机构:中国地质调查局武汉地质调查中心;
  • 出版日期:2018-07-15
  • 出版单位:地球科学
  • 年:2018
  • 期:v.43
  • 基金:中国地质调查局项目(Nos.12120114005701,DD20160029);; 国土资源部公益性行业专项(No.201411075)
  • 语种:中文;
  • 页:DQKX201807018
  • 页数:11
  • CN:07
  • ISSN:42-1874/P
  • 分类号:248-258
摘要
花垣矿集区位于我国湘西-黔东成矿带,作为世界级的超大型铅锌矿床之一,预测储量超过千万吨,位于花垣矿集区中部渔塘矿田的柔先山铅锌矿床是区内典型的铅锌矿床.采用闪锌矿Rb-Sr分相法获得了柔先山铅锌矿床的Rb-Sr等时线年龄为412±6Ma(MSWD=1.5,初始~(86)Sr/~(87)Sr=0.709 32),地质时代为早泥盆世,这一年龄限定了花垣地区铅锌矿床的时代.柔先山矿床的铅锌矿矿石流体包裹体、Sr-S-Pb同位素示踪研究显示,成矿流体可能是地层封存水与后期迁移流体的混合,成矿元素中的铅主要来源于围岩,硫由赋矿层位之上的含膏岩层经历热化学还原过程供给,铅和锶同位素特征都指示上地壳来源.
        In Western Hunan-Eastern Guizhou metallogenetic belt,the Huayuan ore concentration area with ten-million-tons expected reserves of Pb and Zn,is one of the world-class super-large Pb-Zn ore deposits.Rouxianshan Pb-Zn deposit located in the center of Huayuan area,is a typical deposit in the Yutang ore field.This study carries out Rb-Sr geochronology study of sphalerites from Rouxianshan,and utilizes phase-seperation method to achieve an ideal Rb-Sr isochron line,yielding an Early Devonian age of 412±6 Ma(MSWD=1.5,initial ~(86)Sr/~(87)Sr=0.709 32),which is meaningful for constraining the ore-forming age in Huayuan area.The fluid inclusions,Sr-S-Pb isotopic composition of ore samples from Rouxianshan have also been analyzed.The results indicate that the ore-forming fluid may have originated from a mixture of strata-sealed water and transporting fluid,and the ore is characterized by Pb-Sr isotopic composition from upper crust.Further,the Pb in ores mainly comes from the wall rocks,and the S attributed to the thermo-chemical sulfate reduction(TSR)of overlying gypsum-bearing rock formation.
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