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矿床地质  2007 

新疆蒙库铁矿床矽卡岩矿物学特征及其意义

Keywords: 地质学,矽卡岩,磁铁矿,电子探针分析,蒙库,新疆

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Abstract:

蒙库铁矿床是一个以下泥盆统斜长角闪变粒岩(原岩为火山岩)为围岩的大型矽卡岩型矿床,矽卡岩矿物组合为辉石、石榴子石和方柱石,退化蚀变岩的组成矿物为角闪石、绿帘石、绿泥石、磷灰石等。电子探针分析结果表明,矽卡岩矿物中单斜辉石以透辉石为主,仅存在少量普通辉石;石榴子石端员组分以钙铁榴石为主,伴以少量钙铝榴石和锰铝榴石;角闪石属于单斜角闪石中的阳起石。蒙库铁矿床的矽卡岩与正常的矽卡岩矿床形成方式不同,不是中酸性岩浆与碳酸盐地层接触交代的产物,而是由热流体沿裂隙交代火山变质岩形成的。

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