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矿床地质  2005 

大厂锡多金属矿田铜坑-长坡矿床流体包裹体研究

Keywords: 地球化学,流体包裹体,成矿作用,锡石硫化物矿床,铜坑_长坡,广西

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Abstract:

铜坑-长坡锡石硫化物矿床是桂西北大厂矿田中的一个超大型矿床,由浅部的脉状矿体和中-深部的层状矿体组成。文章应用显微测温和激光拉曼光谱分析对铜坑-长坡矿床进行了系统的流体包裹体参数和成分的测试。结果显示,铜坑-长坡矿床脉状和层状矿体的流体包裹体具有相同特征,包裹体的类型主要有CO2型和NaCl_H2O型。3个成矿阶段的均一温度分别为:270~365℃,210~240℃和140~190℃。早阶段(Ⅰ、Ⅱ阶段)成矿流体成分主要为CO2和H2O,含少量CH4和H2S,密度为0.324~1.093g/cm3,盐度w(NaCleq)主要集中于1%~7%;晚阶段(Ⅲ阶段)成矿流体成分主要为H2O,且Ca2+和Mg2+含量增加,密度为0.893~0.972g/cm3,盐度w(NaCleq)主要集中于3%~10%。流体包裹体特征和He、Ar、S同位素组成共同表明,铜坑-长坡矿床脉状及层状矿体具有相同的成矿物质来源和相同的成因,成矿作用与燕山期构造、岩浆热事件有关。基于3He/4He比值高和富CO2流体的存在,认为在铜坑-长坡矿床成矿过程中有深部地幔流体的参与。

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