北祁连西段蛇绿岩型超基性岩微量元素特征及其地质意义  

Characteristics of Trace Elements for the Ultrabasic Rocks of Ophiolite in the Western Part of the North Qilian and Its Geological Significance

作　　者：郭原生[1] 孙淑荣[1] 傅学明[1] 

机构地区：[1]兰州大学地质系,兰州730000

出　　处：《兰州大学学报（自然科学版）》1993年第3期206-212,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：甘肃省中青年科学基金

摘　　要：作者通过北祁连西段蛇绿岩层序中超基性岩的野外调查及室内研究,从微量元素入手,对该区蛇绿岩型超基性岩的岩石化学特征及其地质意义作了全面的探讨。得出,该类超基性岩体是由分异作用相对较小的深部地慢物质,在氧逸度较低的情况下,被构造挤压固体侵位形成的结论。On the basis of field investigation and laboratory studies on the ultrabasic rocks of ophiolite in the western part of the North Qilian Mountain,especially on the trace elements in them,this paper discusses in detail the petrochimical characteristics of the ultrabasic rocks in the area and its geological significance. It is concluded from the results that the tectonically emplaced ultrabasic rocks originate from the deep—seated mantle materials characterized by relatively weak differentiation and comparatively low oxygen fugacity.

关 键 词：蛇绿岩 超基性岩 橄榄岩 微量元素 

分 类 号：P588.125[天文地球—岩石学]