摘要
通过对甘肃肃南白泉门地区不同构造岩块中的玄武岩、硅泥岩及砂岩的岩石学、地球化学及构造特征的综合研究，认为它们分别形成于洋脊、洋岛、岛弧、板内及活动大陆边缘等多种环境。各种环境的块体相互混杂并与蛇绿岩的基性－超基性岩岩块混杂产出，形成蛇绿混杂岩。该蛇绿混杂岩是北祁连中段加里东俯冲杂岩体的重要组成部分。
The authors have made the comprehensive study on the petrology, lithogeochemistry and tectonic feature of basalts, silicalites, mudstones and sandstones in different tectonic block of Bai quanmen area of Sunan county, Gansu province and thought that they form separately in the environment of ocean ridge, oceanic island, continetal island arc, continental margin and intraplate. The blocks in the various environments mixed together and mixed and accumulated with a lot of ultrabasic rock blocks and formed the ophiolitic melange, which is the important unit of subduction complex body of the Northern Qilian Caledonides.
出处
《地球科学进展》
CAS
CSCD
1997年第4期340-350,共11页
Advances in Earth Science
基金
国家自然科学基金项目"北祁连蛇绿岩特征
造山带演化及深部作用过程研究"
关键词
蛇绿混杂岩
玄武岩
杂岩
地质特征
形成环境
Gansu, Baiquanmen area, Ophiolitic melange, Basalt, Chert, Sandstone, Foming settings.
