| 滇西上芒岗红色粘土型金矿成冈研究 |
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| 引用本文：.2000.On the genesis of the Shangmanggang red clay type gold deposit, western Yunnan[J].Mineral Deposits,19(2):97~104 |
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| 基金项目:国家自然科学基金（批准号：49873021）和中国科学院重大项目A（KZ-951-A1-404-02） |
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| 中文摘要:上芒岗金矿是滇西地区具代表性的红色粘土型金矿。依据堆积特征、矿物组合和化学成分，可将红色粘土剖面分为6个带，即表土带、坡积带、钙华-沼泽带、残积带、腐泥岩带和基岩带。其中，腐泥岩带为岩溶坍塌成因，残积带由岩溶残积形成，钙华一沼泽带和坡积带为地表水流搬运堆积。矿床成因为在中晚燕山期形成的原生卡林型金矿化基础上，经第三纪上新世的岩溶、残积和坡积作用的预富集，由不彻底的红土化作用使金以硫代硫酸盐络合物的形式活化迁移到粘土层的中下部，被低价铁锰离子所还原而再沉淀富集形成。 |
| 中文关键词:金矿 红色粘土型矿床 成矿作用 滇西上芒岗 |
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| On the genesis of the Shangmanggang red clay type gold deposit, western Yunnan |
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| Abstract:The Shangmanggang gold deposit is a typical red clay type gold deposit in western Yunnan. According to accumulation characteristics, mineral assemablages and chemical compositions, the red clay profile can be divided into six zones as follow s: ① topsoil zone composed of grey to b row n kaolinitic clays and muck; ② slope wash zone characterized by yellow to brown clays with some greyish white to white pipe-like kaolinitic clays, and large quantities of mudrock and siltstone gravels; ③ travertine-fen zone consisting of black bass or, locally, greyish white to grey clays and lenticular travertine; ④ eluvial zone characterized by red clays composed mainly of illite, kaolinite, goethite, and some primary quartz and plagioclase;⑤ saprolite zone comprising weathered karst collapsed breccias of altered rocks and Jurassic mudrock and siltstone; ⑥ bedrock com posed of altered and mineralized rocks, Jurassic mudrock and siltstone and Permian dolomite. The ore deposit is of weathering type. The ore-forming process consists of the following steps: first, the primary Carlin type gold mineralization supplied the ore-forming material during late Yanshanian perriod; second, the ore-forming materials were accumulated by karstification, eluviation, and slope washing during early Pliocene; finally, gold was concentrated in the middle-lower part of the red clay profile by lateritization during Pliocene. |
| keywords:gold deposit, red clay type deposit, metallogenesis, Shangmanggang |
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