JIANG DaWei,
ZHANG ShiMin,
LI Wei et al
.2018.Foreland deformation pattern of the southern Longmen Shan in Late Quaternary.Chinese Journal Of Geophysics,61(5): 1949-1969,doi: 10.6038/cjg2018M0253
龙门山南段前陆区晚第四纪构造变形样式
姜大伟, 张世民, 李伟, 丁锐
中国地震局地壳应力研究所, 地壳动力学重点实验室, 北京 100085
Foreland deformation pattern of the southern Longmen Shan in Late Quaternary
JIANG DaWei, ZHANG ShiMin, LI Wei, DING Rui
Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
Abstract：The foreland of the south-central Longmen Shan is the only area which hosts Cenozoic thin-skinned structures and sedimentary basins in the eastern margin of the Tibetan Plateau. Studying the latest tectonic deformation patterns can help us to understand the mechanism of the eastward expansion of the Tibetan Plateau. This paper focuses on the foreland of the southern section of the Longmen Shan.Through the surveys to the Qingyijiang River terraces and the ancient Qingyi River alluvial fans, we have studied the tectonic pattern and the Late Quaternary deformation in this region. The results show that (1) the longitudinal profile of the Qingyijiang River terraces indicates that the Late Quaternary deformation in the foreland of the southern Longmen Shan was mainly a folding process, and the overall crust shortening rate was 2.5~3.9 mm·a-1, much larger than the 0.48~0.77 mm·a-1 of the mountainous thrust zone. Therefore, the shortening of the crust in the southern section of the Longmen Shan was mainly absorbed by the foreland region. (2) The deformation of the ancient alluvial fans of the Qingyijiang River shows that there were two N-S striking thrust faults in the foreland superimposed upon the SW-NE striking anticlines and thrust faults. It suggest the NW-SE shortening was controlled by the southeastward push of the Bayan Hark block, and the E-W shortening was characterized by the eastward push of the Sichuan-Yunnan block. (3) The extrusion of Sichuan-Yunan block may play a key role in controlling the formation of foreland thin-skinned fold structure in the south-central segment of the Longmen Shan. Since the Miocene when Sichuan-Yunnan block was extruded to the southeast, the southwestern corner of the Sichuan Basin acted as a diversion wedge for motion of the Tibetan Plateau. The southwestern side was diverted southwestwards through the left-lateral slip of the Xianshuihe-Xiaojiang faults zone. The northwest side was diverted to northeastwards through the right-lateral slip of the Longmen Shan faults zone. Accordingly the corner suffered the strongest head-on pushing, and crustal shortening was accommodated by thrust faulting and foreland folding. In addition, under such a structural load, the Chengdu sedimentary basin was formed.
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