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

LI Zhigang; LIU Jing; JIA Dong; SUN Chuang; WANG Wei; YAO Wenqian

2016 Vol. 35, No. 11

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LI Zhigang, LIU Jing, JIA Dong, SUN Chuang, WANG Wei, YAO Wenqian. Late Pliocene oblique thrusting and regional stress field changes in southern Longmen Mountain, eastern Tibet[J]. Geological Bulletin of China, 2016, 35(11): 1829-1844.

Citation:

LI Zhigang, LIU Jing, JIA Dong, SUN Chuang, WANG Wei, YAO Wenqian. Late Pliocene oblique thrusting and regional stress field changes in southern Longmen Mountain, eastern Tibet[J]. Geological Bulletin of China, 2016, 35(11): 1829-1844.

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

Abstract

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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References

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