西金乌兰构造混杂带中基底变质岩的特征和意义

Characteristics of the basement rock in the Xijir Ulan structure belt and geological significance

在可可西里的西金乌兰湖一带首次发现了基底变质岩。岩石组合以石英质变质岩石组成。原岩为沉积建造。出露仅限于西金乌兰构造混杂带内。根据区域对比,认为是羌塘陆块的结晶基底。说明西金乌兰构造混杂带是羌塘陆块上裂解形成的。

The basement rock discovered for the first time in Xijir Ulan lake of Hoh Xil in 2001, was limited in the side of the Xijir Ulan structure belt.The rock association is quartzose metamorphic rock and its primitive rock is sedimentary formation.It is the part of Qiangtang besement by regional contrast study.Suggests that the Xijir Ulan structure belt is splitting from Qiangtang massif.