西藏班公湖-怒江结合带中段沙木罗组的发现

Discovery of the Shamuluo Formation in the central segment of the Bangong Co-Nujiang River suture zone, Tibet

摘要: 西藏班公湖—怒江结合带是青藏高原一条重要的板块结合带,是羌塘板片和冈底斯-念青唐古拉板片的分界1。西藏中部安多县东巧和切里湖一带位于班公湖-怒江结合带中段,以发育“面状”蛇绿岩著称2。西藏地质调查院在承担中国地质调查局国土资源调查项目“1∶25万班戈县幅区域地质调查”期间,首次发现上侏罗统—下白垩统沙木罗组角度不整合覆盖于木嘎岗日岩群之上,确定了班公湖-怒江结合带的封闭时代,对研究特提斯演化具有重要意义。1剖面描述沙木罗组剖面位于安多县得萨乡懂错北约6km次玛附近,起点坐标为东经91°08'26″,北纬31°50'55″。剖面…

Abstract: On the basis of a study of the Muggar Kangri Group-complex and its cover sediments in the central segment of the Bangong Co-Nujiang River suture zone, Tibet, it has been ascertained that the Shamuluo Formation (J3-K1s) consists of sediments of a relict se