Some think that the many ophiolites that define the suture are not remnants of a very big ocean, but of a small back-arc basin structure.[3] More recently it has been suggested that these ophiolites formed during Early
Cretaceous subduction initiation (Hu and Stern, 2020). You can watch a video about this at https://www.youtube.com/watch?v=02Xojnf9sYA
See also
Geology of the Himalaya – Origins and structure of the mountain rangePages displaying short descriptions of redirect targets
^Bédard, É.; Hébert, R.; Guilmette, C.; Lesage, G.; Wang, C.S.; Dostal, J. (2009). "Petrology and geochemistry of the Saga and Sangsang ophiolitic massifs, Yarlung Zangbo Suture Zone, Southern Tibet: Evidence for an arc–back-arc origin". Lithos. 113 (1–2): 48–67. Bibcode:2009Litho.113...48B. doi:10.1016/j.lithos.2009.01.011.
Hu, H., and Stern, R. J., 2020. Early Cretaceous Subduction Initiation in Southern Tibet Caused the Northward Flight of India. Geoscience Frontiers 11, 1123-1131.