摘要
川东南"隔档式构造"中的众多背斜,平面上呈左行斜列式展开,剖面上显示为中生界与下古生界双层花状构造叠合体。在分析区域地质背景、褶皱结构特征的基础上,结合生产勘探实际资料提出:这种构造格局应是在区域应力场由张性转变为压扭性的背景下,受周边构造环境、基底性质和深部断裂控制逐步形成的,经历了褶前张裂、初步褶皱、晚期定型3个主要演化阶段,是在纵弯褶皱作用、横弯褶皱作用及剪切褶皱作用3种变形方式共同作用下形成的中生界与下古生界"双层花状构造"的叠合体。
Anticlines from ejective structure in southeast Sichuan distribute sinstral in horizontal plane and the vertical section showed as overlapping-structures beared in upper Mesozoic and lower Paleozoic.Based on the analysis of regional geology background, structural feature and exploration data, a viewpoint is advanced in this paper that the structural framework in southeast Sichuan was formed successively under the background of transition of regional stress field from tension to compresso-shear.The structural environment,the characteristic of basement and the deep-fault are control factors in their forming process. The evolutionary history could be divided into three stages as pre-folding tension,primary folding and final forming. Most of the anticlines we see today could be regarded as superimposed bodies of two-level flower-structure,and the folding mechanism contained three factors of bend folding,buck folding and shear folding.
出处
《天然气地球科学》
EI
CAS
CSCD
2005年第3期278-282,共5页
Natural Gas Geoscience
基金
中国科学院知识创新工程(编号:KZCXZ-SW-117)
国家自然科学基金项目(编号:40072022)资助.
关键词
隔档式构造
褶皱作用
花状构造
构造叠合体
压扭
Ejective structure
Folding
Flower-structure
Overprinting-structure
Compresso-shear.
