The archipelagic arc tectonic evolution of the Meso-Tethys in the western part of the Bangong Lake-Nujiang suture zone

Abstract

The spatial-temporal framework of the arc-basin systems in the western part of the BangongLake-Nujiang suture zone may be divided,from north to south on the basis of the results of the(1∶250 000) geological mapping,into the Wufengjian-Larelaxin Late Jurassic-Early Cretaceous epicontinental volcanic-magmatic arc zone,northern and southern subzones of the Bangong Lake ophiolitic melange zone,and Nganglong Kangri-Baingoin Cretaceous-Eocene magmatic arc zone.The Meso-Tethyan Ocean once went through the Triassic-Early Jurassic spreading,Middle-Late Jurassic northward and southward bidirectional subduction,Late Triassic-Early Cretaceous residual ocean sea basin and Early-Late Cretaceous continent-arc continent collision.