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地球学报  2003 

铜陵中生代中酸性侵入岩特征及成因

Keywords: 高钾钙碱性系列,橄榄安粗岩系列,侵入岩,成因,铜陵

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Abstract:

铜陵地区中酸性侵入岩可以划分为橄榄安粗岩系列和高钾钙碱性系列,橄榄安粗岩系列的岩石组合为辉石二长闪长岩+二长闪长岩+石英二长岩,这些岩石的里特曼指数大于4(变化于4.2~5.8之间),岩石的稀土总量((REE)变化于211×10-6~264×10-6之间,且与金矿床关系较密切。高钾钙碱性系列侵入岩岩石组合为闪长岩+石英二长闪长岩+花岗闪长岩,岩石的里特曼指数小于4(1.8~3.2),ΣREE为130×10-6~188×10-6,与铜矿床关系较为密切。结合包体岩石学研究得出,橄榄安粗岩系列岩浆为幔源碱性基性岩浆分异的产物,高钾钙碱性系列岩浆是分异的幔源岩浆和壳源酸性岩浆混合的产物。

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