松潘—甘孜造山带东缘大水沟地区变质变形作用

Deformation metamorphism of the Dashuigou thrust detachment slice on the eastern margin of the Songpan Garzê orogenic belt

松潘—甘孜造山带东缘大水沟逆冲—滑脱岩片的边界断裂为韧性剪切带，具逆冲—推覆性质，在中生代碰撞造山过程中逆冲叠置于扬子陆块之上。岩片经历了晚二叠世裂谷变质、晚三叠世末至早中侏罗世滑脱—收缩动热变质和晚侏罗世热隆接触变质３期变质变形作用，尤其是后二者影响深刻，奠定了现今热隆构造，并伴有碲矿床的形式。

The boundary fault of the Dashuigou thrust detachment slice on the eastern margin of the Songpan Garze orogenic belt is a ductile shear zone, which was thrust over the Yangtze continental block in the process of Mesozoic collision orogeny. The slice underwent three phases of deformation metamorphism, i.e. Late Permian rifting metamorphism, terminal Late Triassic to early Middle Jurassic decoupling constriction dynamothermal metamorphism and Late Jurassic thermal doming contact metamorphism, of which the last two had more profound influence. They resulted in the formation of thermal dome structure, accompanied by the formation of tellurium deposits.