Prior to the Mesozoic it was two blocks, the North Lhasa Block and the South Lhasa Block. About the end of the Permian these were amalgamated into the Lhasa Plate. The Lhasa Plate moved northward in the Cretaceous, and in the Cretaceous crunched into the Qiangtang Block forming the Banggongco-Nujiang Collision Zone (Banggong Suture) The collision may have begun as early as the late Jurassic, continued through the Cretaceous and into the early Paleogene.
^ abMetcalfe, I, (1994) "Late Paleozoic and Mesozoic paleogeography of eastern Pangea and Thethys" pp. 97-111 In Embry, Ashton F.; Beauchamp, Benoit and Glass, Donald J. (editors) (1994) Pangea: Global Environments and Resources (Memoir 17) Canadian Society of Petroleum Geologists, Calgary, Alberta, Canada, ISBN 978-0-920230-57-2