班公湖-怒江缝合带夹持于羌塘地块与拉萨地块之间,缝合带本身复杂的构造演化历史使得有关该缝合带的许多重要地质问题一直存在较大的争论。围绕着洋壳的俯冲方向,国内外学者先后提出洋壳向北俯冲,向南俯冲以及向南向北双向俯冲,争议较大。本文以班公湖怒江缝合带中段安多县白垩系马登火山岩为研究对象,根 The Banghu-Nujiang suture zone is sandwiched between the Qiangtang block and the Lhasa block. The complicated structural history of the suture zone has led to considerable controversy over many important geological issues concerning the suture zone. Around the subduction direction of the oceanic crust, scholars both at home and abroad have proposed that the oceanic crust should be diverted northward, subducted southward and diverted southward and northward, which is a controversial issue. In this paper, the Andean Cretaceous Madden Volcanic Rock in the middle section of Nujiang suture zone in Bangong Lake was studied.