兰坪盆地某些逆冲推覆构造研究  

A PRELIMINAPY STUDY OF SOME THRUST-NAPPE STRUCTURES IN LANPING BASIN

作　　者：李光勋[1] 

机构地区：[1]云南省地质科学研究所

出　　处：《云南地质》1994年第2期203-215,共13页Yunnan Geology

摘　　要：本文厘定了兰坪盆地某些逆冲推覆构造的存在并作了深入的探讨。提出该区推覆构造属由西侧的自南西西向北东东推覆和东侧的自北东东向南西西推覆的两组逆冲断层组成的对冲结构类型。通过宏观和微观资料的综合研究，构造应力场属晚特提斯构造活动的一部分，即印度板块与欧亚板块会聚时，于滇西派生出北东东一南西西向的挤压应力场，形成陆壳内部边缘以脆性变形为主的薄皮构造。推覆构造主要形成于喜马拉雅运动早期，对其深入研究，于滇西喜马拉雅期构造特征的认识具有重要的意义。In this paper, we confirm the exist of some thrust-nappe structures and study them profoundly. It is put forward that the nappe structure in this region belongs to the oppositethrusting structure type formed by two sets of thrusts of ones thrusting from SWW to NEE in the west side and those thrusting from NEE to SWW in the east side.Basing upon the comprehensive study of macroscopic and microscopic data, we believe that the sturctural stress field is a part of Late Tethys structural movement. That is to say,the NEE-SWW compressional stress field in West Yunnan was derived from the convergence of Indian Plate and Eurasia Plate , which formed the thin-skinned structure mainly with brittle deformation along the continental inner margin.The nappe structure was mainly formed in Early Himalayan Movement. The profound study on it is very important in understanding the charateristics of Himalayan structures in West Yunnan.

关 键 词：推覆构造 应力场 兰坪盆地 

分 类 号：P542.3[天文地球—构造地质学]