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地质论评  2006 

新疆准噶尔-东天山地区产于韧性剪切带中的金矿床成矿流体与碳、硫、铅同位素

Keywords: 新疆准噶尔-东天山地区韧性剪切带型金矿床流体包裹体碳硫铅同位素

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Abstract:

韧性剪切带型金矿床是新疆准噶尔-东天山地区重要金矿类型。本文以科克萨依、康古尔、红石金矿为典型矿床,研究它们的流体包裹体均一温度、爆裂温度、包裹体成分、包裹体水的来源等,并进行了硫、铅同位素及近矿围岩碳同位素、矿体石英包裹体中CO2、CH4气体的碳同位素分析。结果表明,硫、铅为深源,暗示了本区金成矿物质的地幔来源。部分碳为有机碳,反映了本区年轻碳质沉积地层中有机碳参与了金的迁移与成矿作用。综合研究表明,在本区特定的后碰撞地质背景下,在构造挤压与伸展作用中形成的韧性剪切带中的金矿床金成矿物质源于深源,成矿流体主要是变质水。岩浆作用、变质作用、碳质围岩地层有机碳参与成矿,变质流体与岩浆热液及天水等流体的不同程度的混合与叠加,形成本区特征的韧性剪切带型金矿床。

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