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西藏西部地区埃达克质侵入岩及铜金找矿意义

, PP. 491-501

Keywords: 西藏西部,埃达克岩,地球化学,成因,找矿意义

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Abstract:

本文报道的西藏西部地区中酸性侵入岩,其形成时代为11.8~25Ma,滞后于洋壳俯冲作用,具有高Si02(56.00%~70.62%)、Al2O3(14.23%~16.85%)、K2O(1.74%~4.33%)、Na2O(一般Na2O/K2O>1)、Sr(420~938μg/g),贫Y(7.16~16.0μg/g),低MgO和CaO,富集LILE元素及LREE,亏损HREE等特征,表现出与埃达克岩相似的地球化学特征。结合其形成时代和地质背景分析,其成因与俯冲洋壳熔融无关,而与藏北埃达克质火山岩及中国东部C型埃达克岩成因相似,符合加厚地壳熔融模型。文中指出西藏西部地区埃达克岩的厘定具有重要的地球动力学意义和铜金矿找矿意义。

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