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金川超大型铜镍硫化物矿床的铂族元素地球化学特征

, PP. 279-286

Keywords: 铂族元素,铜镍硫化物矿床,地球化学特征,金川

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Abstract:

对金川超大型铜镍岩浆硫化物矿床岩石、矿石的铂族元素地球化学特征研究表明,金川岩体的平均Cu/Pd值远大于原生地幔岩浆的Cu/Pd值,说明其岩石为因硫化物析离而失去Pd的岩浆所结晶;且岩石的PGE具有部分熔融趋势,与地幔橄榄岩接近,这些均指示存在岩浆熔离作用。该矿床岩石、矿石的PGE球粒陨石标准化分布模式比较对应,均可分为两种类型,反映了岩浆多次侵入、熔离分异同时成岩成矿的特征。另外,PGE?S关系分析表明其成岩成矿过程中有少量地壳物质混染。PGE地球化学特征参数还指示了其高镁拉斑玄武质母岩浆的性质。

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