甘肃玉门昌马地区蛇绿混杂岩地质特征  

GEOLOGICAL CHARACTERISTICS OF OPHIOLITIC MIXTITE IN CHANGMA REGION YUMEN GANSU

作　　者：黄增保 许荣科 张彦杰 金霞 

机构地区：[1]甘肃省地勘局第六勘查院,甘肃金昌737100

出　　处：《甘肃地质学报》2001年第2期12-22,共11页Acta Geologica Gansu

摘　　要：昌马地区蛇绿混杂岩位于玉门市昌马乡南锅底坑山一带 ,是北祁连山西段加里东期俯冲杂岩的重要组成部分。带内发育早寒武世裂谷火山—沉积岩系、中寒武世蛇绿岩、蓝片岩等。地球化学特征显示蛇绿岩形成于微洋盆环境 ;蓝片岩为微洋盆有限俯冲之产物。蛇绿混杂岩经历了 4次变形变质作用。Ophiolitic mixtite in Changma region occurrence around Nanguodikengshan of Changma,Yumen,and it is an important part of western Qilian caledonian complex.In this belt,there are development lower Cambrian rift volcanic rocks-sedimentary rocks,mid-Cambrian ophiolite-blueschiste and so on.Its geochemical features shows that the ophiolite formed in micro-ocean basin environment and the blueschist is product of limited subduction micro-ocean basin.The ophiolite has undergone four metamophic processes.

关 键 词：蛇绿混杂岩 蓝片岩 构造演化 昌马地区 甘肃 形成时代 地球化学特征 变形变质作用 

分 类 号：P588.34[天文地球—岩石学]