【摘要】 本文根据1∶25万地质填图成果,将班公湖-怒江结合带西段弧-盆系时空结构自北向南划分为五峰尖-拉热拉新晚侏罗世—早白垩世陆缘火山-岩浆弧带、班公湖蛇绿混杂岩北、南亚带和昂龙岗日-班戈白垩纪—始新世岩浆弧带等,初步认为中特提斯洋经历了三叠纪—早侏罗世扩张,中—晚侏罗世往北、南双向俯冲,晚三叠世—早白垩世残余洋(海)盆和早—晚白垩世陆-弧(陆)碰撞等演化阶段。更多还原

【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 mélange 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.更多还原