【摘要】 通过野外剖面调查,发现本区上侏罗统—下白垩统沙木罗组角度不整合于木嘎岗日岩群之上,从而为确定班公湖-怒江结合带中段的封闭时代提供了确切的地层学依据。将东巧和切里湖一带发育的“面状蛇绿岩”区划分为4个蛇绿岩亚带,其中北拉-觉翁亚带是发育相对完整、原始状态保存较好的蛇绿岩。对测区火山岩和侵入岩调查后认为,班公湖-怒江结合带中段开始裂解的时代为晚三叠世,并且是向南俯冲消减的。更多还原

【Abstract】 By field section survey, it has been found that the Upper Jurassic to Lower Cretaceous Shamuluo Formation rests with angular unconformity on the Muggar Kangri Group-complex in the area and thus providing definite stratigraphic evidence for the determination of the closing age of the central segment of the Bangong Co-Nujiang junction zone. The "areal ophiolites" developed in the vicinity of Dongqiao and Qili Lake is divided into four ophiolite subbelts, of which the Beila-Jueweng subbelt consists of relatively intact, well-preserved ophiolites. Investigations of volcanic and intrusive rocks suggest that the central segment of the Bangong Co-Nujiang junction zone began to break up in the Late Triassic, which provides evidence for its southward subduction.更多还原