| 湘西北铅锌矿床碳氢氧同位素特征及成矿环境分析 |
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| 引用本文：.2007.A tentative discussion on genesis of lead_zinc deposits in northwest Hunan [J].Mineral Deposits,26(3):330~340 |
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| 基金项目:中国地质调查局地质大调查项目（编号：200110200022） |
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| 中文摘要:文章简要介绍了湘西北铅锌矿床的成矿地质背景、铅锌元素在地层中 的分布规律和岩石中的分布情况，并通过研究湘西北铅锌矿床中的洛塔、花垣、凤凰3个铅 锌汞矿床稳定同位素组成特征，阐明了未蚀变的围岩（ 正常灰岩）碳、氧同位素组成特征、轻微蚀变灰岩的碳、氧同位素组成特征及方解石脉的碳 、氧同位素组成特征。根据流体包裹体氢、氧同位素组成特征、流体包裹体的一般特征进一 步探讨了成矿物理化学条件如成矿过程中的成矿温度、成矿压力、盐度、成矿流 体的化学性质、成矿流体的pH值和Eh值，并试尝提出了湘西北铅锌矿床的成矿模式。 认为湘西北铅锌矿床属于密西西比型矿床。 |
| 中文关键词:地质学 铅锌矿 成矿机理 湘西北 |
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| A tentative discussion on genesis of lead_zinc deposits in northwest Hunan |
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| Abstract:This paper describes in brief the metallogenic geological background of lead_zin c deposits in northwest Hunan. Based on a study of stable isotope composition of the Luota, Huayuan and Fenghuang lead_zinc_mercury deposits, the authors analyz ed the characteristic values of the source area, studied sulfur isotope composit ions, made a sulfur source analysis, and recounted carbon and oxygen isotope com positions of unaltered wall rock (normal limestone), slightly altered limestone and calcite. In the light of hydrogen and oxygen isotopic compositions and gener al characteristics of mineral inclusions, the paper further probed into such met allogenic physical and chemical conditions as ore_forming temperature, pressure, salinity and methane concentration, and chemical properties and pH and Eh value s of ore_forming fluids. On such a basis, a metallogenic model for lead_zinc dep osits in northwest Hunan is tentatively put forward. The lead_zinc deposits in n orthwest Hunan are typical Mississippi Valley_Type lead_zinc deposits. |
| keywords:geology, lead_zinc deposit, metallogenic model, northwest Hunan |
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