滇西无量山北缘弧形推覆构造  

ARCUATE NAPPE STRUCTURE ON THE NORTHERN MARGIN OF THE WULIANG MOUNTAINS IN WESTERN YUNNAN

作　　者：李述靖[1] 单业华[1] 

机构地区：[1]中国地质大学(北京)地质矿产系

出　　处：《地质学报》1995年第4期296-305,共10页Acta Geologica Sinica

基　　金：国家自然科学基金(编号:9487002-2)

摘　　要：滇西无量山北缘弧形推覆构造是一个具有多重叠置结构的复杂推覆系统。原地系统为保罗系和白垩系组成的北西西向弧形褶皱带。外来系统主要是上三叠统。总体上自南向北推覆,上盘向北北东方向推移距离在10km以上。形成深度约5—10km,形成环境不超过绿片岩相。大体生成于渐新世时期,约40—20Ma之间。The arcuate nappe structure on the northern margin of the Wuliang Mountains in western Yunnan is a complex nappe system with multiple superimposed structures. The autochthonous system is a WNW-vergent arcuate fold belt formed by Jurassic-Creaceous red beds.The allochthonous system, which is mainly composed of grey-black Sandstone and Shale with impure limestone of the Upper Triassic Maichuqing Formation, was thrust over the autochthonous system through complicated deformation, thus forming the frontal arcuate nappe belt, klippes in the middle, and rear overthrusts.On the back side, the Upper Triassic low-grade metamorphic sandstone and slate system was in turn thrust over it. They also together carry the klippe swarm formed by limestone of the Upper Triassic Shanhedong Formation.Generally, the nappe structure moved from south to north, and the hanging walls of the fault were thrust in a NNE direction for more than 10 km. The nappe structure was formed at depths of about 5-10km, largely in the Oligocene, and the formation environment did not exceed the low greenschist facies.

关 键 词：弧形推覆构造 逆掩断层 飞来峰 滇西 推覆构造 

分 类 号：P542.3[天文地球—构造地质学]