地质通报2016，Vol.35Issue(11)：1829-1844,16.
晚上新世龙门山南段斜向逆冲作用和区域应力场转换
Late Pliocene oblique thrusting and regional stress field changes in south-ern Longmen Mountain, eastern Tibet
摘要
Abstract
The co-seismic slip sense of the 2008 Wenchuan earthquake (Mw 7.9) has demonstrated the present east-west (E-W) crustal shortening and oblique thrusting across the Longmen Mountain. However, the oblique thrusting and its initial time remain poorly investigated. By using 3-D seismic reflection data, field investigation, and published dating results, the authors investigated the E-W crustal shortening in the Dayi Fault System (DYFS), and determined tectonic stress field changes during the Late Cenozoic. Two-period tectonic deformations were found in the DYFS, which correspond to the NE-and NS-trending structures, respective⁃ly. The activities of the DYFS and Qiongxi Fault System reflect a change in the direction of the tectonic stress, from NW-SE during the Oligocene and Early Pliocene to E-W from the Late Pliocene to Holocene. The 120km NS-trending structures in the southern Longmen Mountain range front as well as the Wenchuan earthquake co-seismic ruptures are assumed to reflect the active, E-W crustal shortening in Longmen Mountain, eastern Tibet plateau. The results obtained by the authors provide a new perspective for the uplift mechanisms of eastern margin of the Tibetan Plateau.关键词
汶川地震/龙门山/斜向逆冲作用/构造应力场转换/地壳缩短Key words
Wenchuan earthquake/Longmen Mountain/oblique thrusting/tectonic stress field changes/crustal shortening分类
天文与地球科学引用本文复制引用
李志刚,刘静,贾东,孙闯,王伟,姚文倩..晚上新世龙门山南段斜向逆冲作用和区域应力场转换[J].地质通报,2016,35(11):1829-1844,16.基金项目
国家自然科学基金项目(批准号41502187)、国家杰出青年科学基金项目（批准号41225010）和中国博士后科学基金项目 （批准号41502187）
