长江三峡狮子口地区重力滑动构造研究  

A STUDY ON GRAVTY GLIDING TECTONICS IN THE SHlZIKOU AREA,THREE GORGE OF YANGTZE RIVER

作　　者：宋利好[1] 杨森楠[1] 任建业 吴树仁 

机构地区：[1]中国地质大学

出　　处：《长春地质学院学报》1995年第2期149-155,共7页

基　　金：水利部长江水利委员会资助课题

摘　　要：长江三峡工程坝址西南约１０ｋｍ的狮子口地区，发育一个长约８ｋｍ、宽约３ｋｍ的重力滑动构造系统。它由下伏系统、滑动系统和前缘推挤带构成，是一个典型的多层次滑褶型重力滑动构造。它形成时的温、压条件为１３０．５～１９３．７℃和１８０～２３０ＭＰａ；ｌ；形成深度约５～１０ｋｍ；总体岩层收缩量３２．２％；总滑移距离１０６０ｍ；活动时间上限１２７．６５士３８．２９万年。它是燕山运动期间南北向挤压体制下，在黄陵背斜东、西两侧应力屏蔽区内派生的近东西向拉伸构造应力场的产物。Shizikou area is situated on 10 km SW of the site of the Three Gorgehydropower project,where occurs a gravity gliding tectonic system,It consists of 3parts:the underlying system,the gliding system and the front compressed zone. It is atypical multilevel gliding-folding gravity gliding tectonic. Comprehensive analysis of theobtained data from the structure indicates that the deformation temperature ranges from130.5～193.7℃and the pressure ranges from 180～230 MPa,while the horizontaIshortening is 32.2%,the gliding distance is 1060 m,and the up limit of activity period is(127. 65士38.29)× 10￣4a. From the viewpoint of crustal stability,the gravity glidlngtectonic does not beIong to active structure,it has no danger to Three Gorge hydropowerproject.

关 键 词：重力滑动构造 线性影像 黄陵背斜 长江三峡 

分 类 号：P542.3[天文地球—构造地质学]