兰坪金顶铅锌硫化物成矿中硫化氢成因  

Forming Mechanism of H_2S in the Jinding Pb-Zn Deposit,Lanping Basin,Northwest Yunnan Province

作　　者：高永宝[1,2] 薛春纪[3] 曾荣[2] 

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054 [2]长安大学地球科学与资源学院,陕西西安710054 [3]中国地质大学地质过程与矿产资源国家重点实验室,北京100083

出　　处：《地球科学与环境学报》2008年第4期367-372,共6页Journal of Earth Sciences and Environment

基　　金：国家自然科学基金项目(4047205440272050);国家重点基础研究发展计划项目(2002CB4126007)

摘　　要：滇西北兰坪金顶超大型铅锌矿床是目前中国最大的铅锌矿床,也是世界上形成时代最新且唯一的陆相沉积岩容矿的超大型铅锌矿床。为探讨金顶铅锌矿所需大量硫化氢的形成机理,对矿区含有机质包裹体均一温度、硫同位素、碳同位素进行了测试、整理和分析。研究表明:金顶矿区广泛分布的石膏、硬石膏和丰富的有机物质为生成大量硫化氢提供了重要条件;在早期成岩矿化阶段,温度相对较低,以生物还原作用产生硫化氢为主;在主成矿期,伴随着深部幔源流体的上涌,温度升高,油气的高温热化学还原作用产生大量硫化氢。The Jinding giant Pb-Zn deposit in Lanping basin of Yunnan Province is the largest Pb-Zn deposit in China, and also the youngest and only continental sediment-hosted super-large Pb-Zn deposit in the world. In order to study the forming mechanism of H2S, organic inclusions, sulfur isotopes and carbon isotopes were tested and analyzed. The gypsum and kinds of organic matters were all suitable for forming plenty of H2S. In the primary diagenesis mineralization stage, the temperature was relatively lower and the forming mechanism of H2S was mainly bacterial sulphate reduction. While in the major mineralization stage, the temperature rose with the rising of fluid from mantle, and the forming mechanism of H2S was mainly thermochemical sulphate reduction of oil and gas.

关 键 词：硫化氢 生物还原作用 热化学还原作用 金顶铅锌矿床 兰坪盆地 

分 类 号：P611[天文地球—矿床学] P593[天文地球—地质学]