In late Eocene ,the returning of the southern Tibet foreland basin caused the seawater to ret reat gradually from Tibet area f rom east to west .

• 随着褶冲带的上叠式逆冲,形成前渊盆地。当前陆推覆体进一步向印度克拉通推进时,前陆隆起亦随之逐渐向克拉通方向迁移。