摘要
通过对岩体地质特征、暗色包体及Nd、Sr同位素资料研究表明:东昆仑中段中三叠世白日其利岩体是由壳幔岩浆不均一或不彻底多次混合作用形成的,岩体内部呈现出酸性、基性岩浆因混合程度和混合比例不同而形成复杂的岩体结构样式,其基性端元为混合不彻底而残留的辉长质岩石,酸性端元是受轻度混染的二长花岗岩,岩浆混合作用方式以就地混合为主,岩体形成于碰撞造山期后的构造环境。
The studies of geological characteristics, melanic inclusion and Nd Sr isotopeshow that the Triassic Bairiqili rock body in the middle sector of East Kunlun was formed bynonhomogeneous and incomplete mixing of crust and mantle magma many times. The rockbody is complicated in structure pattern as a result of different extent and propartion of mag-matic mixing. The basic end-numbers is residual gabbroite rocks formed by uncomplete mix-ing and the acid end-numbers is admellite with gentle contamination. The way of magmaticmixing is mainly on the spot. So. the rock body was formed in a post collisional and postoro-genic tectonic environment.
关键词
白日其利岩体
壳幔岩浆混合作用
暗色包体
Bairiqili rock body
mixing of crustal and mental magma
melanic inclusion
the middle sector of East Kunlun
