西昆仑造山带花岗岩形成的构造环境

Tectonic Environments of Granitoids in the West Kunlun Orogenic Belt

西昆仑造山带花岗岩存在 6个大的侵入旋回和 9个侵入期 ,分别形成于洋脊环境、火山弧环境、碰撞后隆起环境和造山晚期相对拉张环境。前 3种环境形成的花岗岩记录了洋盆形成→洋壳俯冲→陆 -陆碰撞过程 。

There are six intrusive cycles and nine intrusive periods of granitoids in west Kunlun orogenic belt.The granitoids were formed in ocean ridge,volcanic arc,syn_collision,post_collision uplift and late orogenic environments respectively.The first three granitoids record the processes of ocean basin formation→ocean crust subduction→continent collision whereas the last two granitoids give expressin to the deep mechanism of lithospheric evolution in post_collision period.