Paleocene-Early Eocene (65-40 Ma) Volcanic Rocks in Tibetan Plateau:the Products of Syn-Collisional Volcanism

It has been accepted that the India-Asia continental collision started from about 65 Ma and completed at～45-40 Ma,followed by continued post-collisional convergence to the present.During the collision between India and Asia(～65-40 Ma),the flatly subducted Neo-Tethyan oceanic slab might have undergone roll-back to steeperangles.This roll-back would not only account for the increase in the convergencerate but also induce the upwelling and decompression melting of the convective asthenosphere under Tibetan lithosphere,producing the collisional(or syn-collisional)volcanism.The Paleocene-Early Eocene(～65-40 Ma)volcanic rocks in central and southern Tibetare the products of such collisional(or syn-collisional)volcanism.