四川盆地北部大巴山山前带构造样式与变形机制  

Structure Styles and Their Deformation Mechanisms of Dabashan Foreland Thrust Belt in the North of Sichuan Basin

作　　者：汪泽成[1] 赵文智[1] 徐安娜[1] 李登华[1] 崔瑛[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083

出　　处：《现代地质》2006年第3期429-435,共7页Geoscience

基　　金：国家"973"项目(2001CB209100)

摘　　要：利用最新的地震和地表地质资料,对四川盆地北部大巴山山前构造进行综合解释。按构造样式差异,将大巴山山前构造带划分出3个构造带:通江—黄金口西NW向潜伏断褶带、五宝场—铁山坡NW—NE向构造交汇带及温泉井—奉节近EW向构造带;其对应的前缘构造样式分别为反冲断层型、褶皱滑脱型及双向冲断—褶皱型。中生代以来的构造变形主要有2期:印支晚期,以NE向褶皱作用为主;燕山中、晚期—喜马拉雅期,以NW向冲断—褶皱作用为主。大巴山前缘构造受不同方向挤压应力联合作用的控制。By means of the latest seismic data and surface geology, structure styles of Dabashan foreland thrust belt are comprehensively interpreted. According to the difference in their styles, three structure belts can be determined： NW buried thrust belt of Tongjiang-Huangjinkou, NW-NE intersection belt of Wubaochang-Tieshanpo, and EW structure belt of Wenquanjing-Fengjie. Correspondingly, front structure styles can be divided into 3 types： back-thrust fault type, folded detachment fault type, and vis-à-vis thrust faulted fold type. There are two main stages of structure deformations since Mesozoic. The first one is Late Indo-Sinian epoch, mainly forming NE folds; the other is Mid-Late Yanshan to Himalaya, mostly developing NW thrust faults. Multi-stages stacked structure deformations are very obvious, and controlled by combined pressure stress in different directions.

关 键 词：大巴山前陆盆地 构造样式 构造叠加 冲断-褶皱 

分 类 号：TE121[石油与天然气工程—油气勘探]