晚上新世龙门山南段斜向逆冲作用和区域应力场转换

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

1. 地震动力学国家重点实验室, 中国地震局地质研究所, 北京 100029;
2. 南京大学地球科学与工程学院, 江苏南京 210093

收稿日期: 2016-03-30

修回日期: 2016-06-06

刊出日期: 2016-11-15

Late Pliocene oblique thrusting and regional stress field changes in southern Longmen Mountain, eastern Tibet

1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Department of Earth Sciences, Nanjing University, Nanjing 210093, Jiangsu, China

Received Date: 30 March 2016

Revised Date: 06 June 2016

Publish Date: 15 November 2016

摘要

摘要: 2008年汶川地震（Mw 7.9）同震滑移结果表明，今地壳缩短为近EW向，与龙门山褶皱冲断带斜交。这一斜向逆冲作用的准确起始时间一直未得到很好的约束。基于龙门山南段山前大邑背斜区三维地震解释和构造建模，结合野外地质调查和年代学数据，确定了晚新生代存在NE向和近NS向2期构造变形。120km长的NS向构造切割了NE向构造，表明近NS向构造形成时间较晚。山前大邑和邛西背斜区近NS向断层和褶皱的活动，均反映了龙门山南段局部或区域上水平最大主应力方向的转换过程，渐新世-早上新世的NW-SE向转变为晚上新世-全新世的近EW向。龙门山南段山前发育的NS向构造和汶川地震同震变形均反映出青藏高原东缘最新的EW向地壳缩短过程，为理解青藏高原东缘的隆升机制提供了新的视角。
- 汶川地震 /
- 龙门山 /
- 斜向逆冲作用 /
- 构造应力场转换 /
- 地壳缩短
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, respectively. 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.
- Wenchuan earthquake /
- Longmen Mountain /
- oblique thrusting /
- tectonic stress field changes /
- crustal shortening

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晚上新世龙门山南段斜向逆冲作用和区域应力场转换

1. 地震动力学国家重点实验室, 中国地震局地质研究所, 北京 100029;2. 南京大学地球科学与工程学院, 江苏 南京 210093

Late Pliocene oblique thrusting and regional stress field changes in southern Longmen Mountain, eastern Tibet

1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2. Department of Earth Sciences, Nanjing University, Nanjing 210093, Jiangsu, China

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1. 地震动力学国家重点实验室, 中国地震局地质研究所, 北京 100029;
2. 南京大学地球科学与工程学院, 江苏南京 210093

1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Department of Earth Sciences, Nanjing University, Nanjing 210093, Jiangsu, China