No abstract

a key issue is to reveal the related geological events, including the subduction of the Indian plate, the continental collision between the Indian and Asian plates and subsequent exhumation of Ultra-high/High pressure (UHP/HP) terranes. Precise timing on these different events is crucial to distinguish different successive evolutionary stages from one another within the Himalayan orogeny. Since the Himalayan orogenic belt extends about 2,000 km in length, consistent subduction, collision, and exhumation processes among different segments cannot be expected. Recent studies have shown that the collision initiated in the middle segment of the Yarlung-Tsangpo suture zone (YTSZ) at ca. 65-63 Ma and then spread diachronologically both eastwards and westwards respectively (