西藏羌塘中部冈玛错－双湖蓝片岩带及其构造意义  

GANGMACUO-SHUANGHU BLUESCHIST BELT IN CENTRAL QIANGTANG RAEA OF TOBET AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：胡克[1] 李才[1] 程立人[1] 洪裕荣 

机构地区：[1]长春地质学院地球科学系,西藏区调队

出　　处：《长春地质学院学报》1995年第3期268-274,共7页

基　　金：国家自然科学基金;地质行业基金联合资助项目

摘　　要：冈玛错－双湖蓝片岩带将羌塘地区一分为二，其南例为冈瓦纳型碳酸盐岩　拉斑玄武岩区，北侧为欧亚大陆型碳酸盐岩－碎屑岩区。根据蓝片岩的地质特征和年代学研究，高压变质作用发生在二叠纪－三叠纪早期，是在区域绿片岩相基础上继承发生的。该蓝片岩带标志晚古生代时冈瓦纳与欧亚大陆的分界线。The Qiangtang area is divided into two parts by the Gangmacuo-Shuanghu blueschist belt.The southern part is composed of Gangwana glacialsedimentary and tholeiite while the northern, of Yangtze continental sedimentary. Crossite+epidote and crossite+chlorite in blueschist give the metamorphic conditions of320～400℃,0.6～0. 7 GPa,The geology of the bcueschist,together with the dating ofcrossite(￣40Ar-￣39Ar,method),proves that the HP metamorphism took place from earlyPermian to early triassic and developed on the regional greenschist facies. The authorsbelieve that the blueschist belt marks the boundary between Gangwana and Lauriacontinents during the late paleozoic in Tibet.

关 键 词：蓝片岩带 冈瓦纳大陆 西藏 构造意义 岩石学 

分 类 号：P588.344[天文地球—岩石学] P54[天文地球—地质学]