The rock bodies in the south belt were formed mainly in Yanshanian, followed by Himalayan epoch. Their origin was closely related to the northward subduction of Tethys o ceanic crust in late Yanshanian epoch.

• 其中,南部岩带岩体以燕山晚期为主,喜马拉雅早期次之,成因及形成环境与特提斯洋壳向北俯冲作用密切相关(燕山晚期),同时俯冲结束后的同碰撞条件下的岩浆活动在该岩带内也有明显的反映(喜马拉雅早期);