| 鲁甸乐马厂银矿床地质特征与成矿作用初探 |
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| 引用本文：.1999.A Preliminary Discussion on Geological Characteristics and Ore-forming Process of the Lemachang Silver Deposit in Ludian[J].Mineral Deposits,18(2):121~128 |
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| 基金项目:地矿部重点普查项目“云南鲁甸乐马厂银矿普查 |
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| 中文摘要:乐马厂银矿为地矿部“八五”重点普查项目，普查找矿取得了突破性进展，矿床达大型规模。该矿床类型独特，为国内、外少见的独立银矿床，因此对矿床地质特征和矿床赋存规律进行了较深人研究，取得了新的认识。文章在乐马厂银矿床地质背景基础上，着重研究了该矿床的地质特征及成矿地质作用，并论述了其为产于叠瓦状逆冲-推覆断裂破碎蚀变带中的独立银矿床，其矿化作用过程经历了古构造-沉积（矿源层形成）和构造-热液（充填交代富集）两个阶段，构造活动控制了银矿化作用和银矿体的最终定位。这对在滇东北地区寻找此类银、铅锌矿床具有指导意义。 |
| 中文关键词:银矿床地质 成矿作用 乐马厂 鲁甸 |
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| A Preliminary Discussion on Geological Characteristics and Ore-forming Process of the Lemachang Silver Deposit in Ludian |
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| Abstract:The study of the Lemachang silver deposit was a major reconnaissance project for 8th "Five Year Plan" assigned by Ministry of Geology and Mineral Resources. The reconnais-sance and ore-prospecting made remarkable breakthrough, and the ore deposit was proved to be of large size. Based on years of field practice, the authors found that the ore deposit is an independent silver deposit rarely seen both in China and abroad, thus belonging to a unique type. Through a thorough study of the geological characteristics and the mode of occurrence of the ore deposit, the author has also acquired some new understanding. According to the geological setting or the Lemachang silver deposit, this paper deals emphatically with geological characteristics and ore-forming geological activity of the ore deposit, and points out that the Lemachang deposit is an independent silver deposit in a shatter-alteration zone of imbricated thrusting-napping faults, with its mineralization expriencing the paleostructure-sedimentation ( the formation of the source bed ) stage and the strcutral-hydrothermal (filling-metasomatic enrichment) stage, and the structural activity controlling the silver mineralization and the eventual location of the silver orebody. All these opinions arc of important indicating significance in the prospecting of silver and lead-zinc deposits in northeastern Yunnan. |
| keywords:geology and silver deposit, ore-forming process, Lemachang, Ludian County in Yunnan Province |
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