沁水盆地北端中生代构造变形与构造应力场特征

摘要

The article analyzes and summarizes the structural deformation and tectonic stress field characteristics of the north Qinshui basin based on studying the folds, faults, and joints. The results indicate that the trends of the structure line in different area ares diverse, in the west the structure lines are mainly NE-SW trending; in the east the structure lines are mainly almost SN or NW-SE trending; in the center the structures lines are mainly almost E-W trending. The characters of the folds, fractures, joints and the drainage all manifest that there was almost SN compression in the study area which happened during the Late Paleozoic and the Mesozoic. The azimuth angle of the maximum principal stress is from 161° to 174°, the dip angle is less than 10°, which may be the response of Indosinian tectonic activities. In addition, there may be NW-SE trending compression in the study area which hap-pened during the period from 165±5 Ma to136 Ma, and the azimuth angle of the maximum principal stress is 152°, the dip angle is 1°.%在对沁水盆地北端发育的中生代褶皱、断层和节理等构造研究的基础上，分析并总结了区内的构造变形及构造应力场特征。结果表明：研究区西部构造线以 NE-SW 向为主；东部构造线以近SN或NW-SE向为主；两者之间的构造线方向主要表现为近EW向。研究区内的褶皱、断裂、节理以及水系的发育特征均表明：本区在晚古生代-中生代经历过一期近 SN 向的挤压作用，其最大主应力方位为161°~174°，倾角在10°以内，这期挤压作用可能是对印支期构造活动的响应；此外，在距今165±5 Ma至136 Ma期间，本区可能还经历过一期NW-SE向的挤压作用，其最大主应力方位为152°，倾角1°。