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昆仑造山带中段蛇绿混杂岩的地质地球化学特征

, PP. 194-200

Keywords: 昆仑,蛇绿混杂岩,地质地球化学特征

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Abstract:

昆仑造山带中段蛇绿混杂岩由镁质超基性岩、块状辉石质玄武岩、枕状玄武岩、堆晶岩、斜长岩脉、灰岩岩块及其间的薄层状粉砂质泥岩、泥质粉砂岩组成,并有硅泥组合。不同岩性之间、不同块体之间由剪切带分开,沉积岩显示出浅深水岩块的混杂。其岩石化学主要特征是MgO含量特别高,达33.22%~37.28%,SiO2、CaO、Al2O3、TiO2、K2O含量低,FeO*/(FeO*十MgO)、Ca/Al2O3比值非常低。属镁质超基性岩。超基性岩的常量元素、微量元素,以及稀土元素特征表明,其形成的环境为多硅铝质陆壳成分的大陆边缘盆地(具有洋脊及岛弧的过渡性质)。

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