摘要
在川东地震资料基础上,结合地质资料,系统分析了川东高陡构造特征、演化特征及成因机制。川东高陡断褶带经历了由拉张向挤压转变的动力学环境,主要划分为4期构造演化阶段:弱褶皱阶段(印支期以前)、褶皱雏形阶段(印支期)、褶皱活跃阶段(燕山期)、褶皱定型阶段(喜马拉雅期)。川东高陡断褶带现今构造格局受早期基底断裂控制、晚期多期挤压构造叠加改造,定型"隔挡式"高陡断褶带排状展布;受纵向2套主要膏盐滑脱层及1套次要泥页岩滑脱层影响,川东断褶带纵向上可划分为3个构造形变层,在多期挤压应力过程中,各构造层纵向上形成、演化具有差异性,构造形态截然不同。四川盆地多期挤压构造叠加改造对川东盐类矿床和油气保存产生了重要影响。
On the basis of the seismic data and geological information,we analyzed the tectonic characteristics,evolution and formation mechanism of high and steep structures in eastern Sichuan.The high and steep fault folding belt experienced the dynamic environment change from extension to compression,and is divided into four tectonic evolution stages：the formation of incompetent folding（The Indosinian before）,the formation of embryonic folding（The Indosinian period）,the formation of active folding（The Yanshanian period）,the formation of fold forming（The Himalayan period）.The present tectonic framework of high and steep fault folding belt in eastern Sichuan is controlled by pre-existing structures,and multiple stages of compression tectonic superimposition,finally resulted in the formation of high and steep fault folding belt with is ejective structure.Influenced by two sets of gypsum-salt detachment layer and one set of shale detachment layer,the high and steep fault folding belt in eastern Sichuan can be divided into three tectonic deformation layers.During the multiple stages of extrusion stress,each structural layer shows various structures evolution due to the differences in the longitudinal formation and evoluation.There is some guiding significance to the further study on the control of the multi-phase tectonic superimposition on the salt deposits and the oil and gas preservation.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2015年第11期2046-2052,共7页
Acta Geologica Sinica
基金
国家重点基础研究发展计划"973"项目(编号2011CB403007)资助成果
关键词
高陡断褶带
川东地区
构造样式
构造演化
high and steep fault folding belt
East Sichuan
structural pattern
tectonic evolution
