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地质学报  2006 

藏南邛多江地区花岗岩地球化学特征及成因类型

, PP. 1342-1354

Keywords: 藏南,邛多江,二长花岗岩,元素地球化学,成因类型

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Abstract:

本文以邛多江变质核杂岩中花岗岩为研究对象、分别对仲格耐和倾日二长花岗岩体及相关岩脉的代表性全岩样品主元素、微量元素和稀土元素进行了系统测定。研究结果表明,所研究的2处花岗岩环(株)无论在岩相学和矿物学上,还是在元素地球化学方面均兼具壳幔型花岗岩特点,部分微量元素的特征比值和稀土元素分布型式完全可与高钾钙―碱性系列火成岩相对比。根据全岩样品的矿物学和地球化学特征,可以推断,仲格耐和倾日花岗岩环(株)是深源岩浆与地壳浅部岩(体)层相互作用的结果,而并非是泥质类岩石通过深熔和岩浆结晶分异的产物。仲格耐和倾日花岗岩体的成岩作用与后碰撞造山作用晚期阶段大规模拆离构造活动有关,属后碰撞造山环境中的壳幔型花岗岩。

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