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文摘
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麻阳铜矿是白垩纪砂岩容矿的自然铜矿床，研究了自然铜的产出状态和矿石结构特点过程中，确定了该矿床自然铜的三种存在形式：①岩屑型原生自然铜，是剥蚀源区已有的自然铜矿石经河流搬运而来，这种自然铜可作为寻找剥蚀源区自然铜矿化的标志；②后期热液充填型自然铜，自然铜粒度粗大，形状多变，大多产于碎屑之间的胶结物中，常见交代溶蚀碎屑；③裂隙中次生自然铜，多呈大片的树枝状等不规则状。认为含自然铜岩屑来自剥蚀源区原生自然铜矿化，碎屑粒间充填的自然铜是成岩期或更晚期热液作用的产物，沿断裂或裂隙形成的树枝状．不规则状自然铜是成岩期后构造活动的产物。 |
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其他语种文摘
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Tne Mayang copper deposit is a native copper deposit, hosted by Mesozoic sandstones and conglomeratic sandstones in the Yuamna Basin. By studying native copper ore-textural characteristics by transmitted and reflected light microscopy, three forms of native copper were distinguished： ①native copper mineralization occurs in detrital siliceous rocks, which were formed in the provenance district （Xuefeng Mountain region） , and this type of copper is the possible genetic marker of the Mayang copper mine; ②the disseminated native copper mineralization, occurring as a kind of cements, always replaces detrital minerals, and are associated with calcite cements or sericitized matrix. The above characteristics of disseminated native copper are similar to those of hydrothermal replacement deposits, and the native copper was formed during the post-depositional stage or even post-diagenetic stage; and ③the secondary native copper occurs in fault surface with gypsum, this type of mineralization is controlled by fault which cuts through the disseminated orebedies. As above described, the types of native copper mineralization show a multiple evolution for the Mayang native copper mine. |
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来源
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矿物学报
,2007,27(3/4):384-387 【核心库】
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关键词
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自然铜
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矿石结构
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矿化
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湖南麻阳
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地址
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1.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550002
2.
麻阳铜矿, 湖南, 麻阳, 419413
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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东华理工大学核资源与环境教育部重点实验室开放基金项目
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:3057101
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