| 云南华宁-峨山地区震旦系沉积岩铜矿床成因 |
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| 引用本文：.1999.Genesis of the Sinian Sediment-host Copper Deposits in Huaning-Eshan Area, Yunnan Province[J].Mineral Deposits,18(2):138~145 |
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| 基金项目:国家自然科学基金与国家计委科技找矿基金 |
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| 中文摘要:云南震旦系沉积岩铜矿是产于红色碎屑岩系中的沉积叠加热液改造型铜矿床，矿床产在上震旦统陡山沱组灰白色砂岩、白云岩、泥灰质页岩中，具有明显层控特征。地球化学分析表明，震旦系碎屑岩中铜富集系数明显高于正常壳源沉积岩，因此加里东期后生改造矿化物质直接来自下部红色沉积岩层的淋滤迂移，最终在氧化还原过渡带与同生富集矿层叠加。碎屑岩中粘土矿物全部为埋藏变质和区域变质形成的伊利石，沉积粘土到伊利石的相变脱水是后生成矿热液的直接来源。控矿构造是加里东期平缓背斜叠加层间破碎及走向断层构造。 |
| 中文关键词:震旦系 沉积岩铜矿 沉积改造矿床 地球化学 云南华宁-峨山地区 |
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| Genesis of the Sinian Sediment-host Copper Deposits in Huaning-Eshan Area, Yunnan Province |
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| Abstract:The Sinian sediment-hosted copper deposits in Yunnan Province are found to be sedimentary copper ones reformed by hydrothermal solution. Copper deposits occur in Upper Sinian greyish white sandstone, dolomite and marl shale and show the character of stratabound copper deposits. Geochemical characteristics of sedimentary rocks suggest that the copper enrichment coefficient of Sinian clastic rocks is higher than that of the common clastic rocks. Therefore, copper contained in hydrothermal solution must have originated from copper leached form red clastic rocks and then mixed up with copper in the sedimentary copper ore bed. Argillites consist of illite derived from sedimentary clay minerals formed in burial and regional metamorphism. The dehydration caused by facies change from sedimcntary clay to illite is directly responsible for the epigenetic ore-forming hydrothermal solution, and the ore-control structures arc gentle anticlines subjected to interlayer shattering and strike faults. |
| keywords:Sinian, sediment-hosted copper deposit, sedimentary and reformed copper deposit, geochemistry |
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