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矿床地质  2012 

金川铜镍硫化物矿床的岩浆质量平衡与成矿过程

Keywords: 地球化学,锆石U-Pb年龄,岩浆质量平衡,镁铁-超镁铁质岩体,茅草泉,金川

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Abstract:

金川铜镍硫化物矿床及其与附近的镁铁-超镁铁质岩体的成因关系对成岩成矿理论研究及找矿具有重要意义。通过对镁铁-超镁铁质岩体的岩石学、年代学、岩石地球化学、同位素地球化学研究,获得金川附近的茅草泉镁铁-超镁铁质岩体中单颗粒锆石U-Pb年龄为(832.5±1.5)Ma,与金川超镁铁质岩体中锆石U-Pb年龄(831.8±0.6)Ma在误差范围内一致。岩石地球化学数据显示,金川岩体与茅草泉岩体都属于亚碱性拉斑玄武岩系列,微量及稀土元素配分曲线平行,变化趋势相似,属于右倾型,具有Nb、Ta负异常;Cu/Zr比值显示过渡变化特征,Cu/Ni比值都小于1,原始地幔标准化的铂族元素配分曲线平行过渡。同位素地球化学数据显示,样品具有高正εSr(t)值,低的εNd(t)值,较低的206Pb/204Pb值,指示岩浆源区为EMⅠ型富集岩石圈地幔。多种方法证明了金川、茅草泉岩体具有同期同源岩浆演化特征,茅草泉小岩体群可能是金川母岩浆先期侵入岩相,为金川矿床的形成贡献了亲铁元素与橄榄石成分。

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