西金乌兰构造混杂岩带特征  

Characteristics of the Xijir Ulan tectonic melange belt

作　　者：王永文[1] 王玉德[1] 李善平[1] 张林[1] 

机构地区：[1]青海省地质调查院,青海西宁810012

出　　处：《西北地质》2004年第3期15-20,共6页Northwestern Geology

基　　金：国土资源大调查项目(20001300009211)

摘　　要：西金乌兰构造混杂岩带为西金乌兰-金沙江缝合带的西端,由于以往研究程度低而认识较为模糊。通过1∶25万区调系统研究表明,混杂岩带组成复杂,由基底岩块、海滩砂岩、辉长(辉绿)岩墙群、蛇绿岩、硅质岩、灰岩(海山)、复理石和磨拉石组成。蛇绿岩环境分析表明,部分为洋中脊环境,大部分为洋岛环境。明确了西金乌兰构造混杂岩带由一系列向南俯冲的逆冲断层分隔的岩块组成。初步总结了西金乌兰蛇绿构造混杂岩带的演化过程。The Xijir Ulan tectonic melange belt is the western part of Xijr Ulan-Jinshajiang sutural zone,because study in low degree in the past,it is still indefinite.After 1:250 000 regional surveys,study shows that the belt is comlex.It consists of basement,seabeach-sandstone,gabbro(diabase)dike swarm wall group, ophilite,silicalite,limestone(kop) ,flysch,and molasses.The ophiolite partly formed ocean ridge,mainly formed in an ocean island.Confined the Xijir Ulan tectonic melange belt consists of a sierise blocks seprated by thrust towards south. The evolution progress of the The Xijir Ulan tectonic melange belt is summarized primarily.

关 键 词：西金乌兰构造混杂岩带 特征 西金乌兰一金沙江缝合带 青海 可可西里 

分 类 号：P542.36[天文地球—构造地质学]