Structure and Stress Field of the Lithosphere Between Pamir and Tarim

被引:20
作者
Bloch, Wasja [1 ,2 ]
Schurr, Bernd [1 ]
Yuan, Xiaohui [1 ]
Ratschbacher, Lothar [3 ]
Reuter, Sanaa [3 ]
Kufner, Sofia-Katerina [1 ,4 ]
Xu, Qiang [5 ,6 ]
Zhao, Junmeng [5 ,6 ]
机构
[1] GFZ German Res Ctr Geosci, Potsdam, Germany
[2] Univ British Columbia, Earth Ocean & Atmospher Sci, Vancouver, BC, Canada
[3] Tech Univ Bergakad Freiberg, Geol, Freiberg, Germany
[4] British Antarctic Survey, Cambridge, England
[5] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China
[6] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
关键词
continental collision; Pamir; delamination; subduction; COLLISIONAL OROGENS; EARTHQUAKE; SUBDUCTION; BENEATH; ZONE; TRANSFORMATION; DELAMINATION; TIBETAN; CRUSTAL; MODELS;
D O I
10.1029/2021GL095413
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The Pamir plateau protrudes similar to 300 km between the Tajik- and Tarim-basin lithosphere of Central Asia. Whether its salient location and shape are caused by forceful indentation of a promontory of Indian mantle lithosphere is debated. We present a new local-seismicity and focal-mechanism catalog, and a P-wave velocity model of the eastern part of the collision system. The data suggest a south-dipping Asian slab that overturns in its easternmost segment. The largest principal stress at depth acts normal on the slab and is orientated parallel to the plate convergence direction. In front (south) of the Asian slab, a volume of mantle with elevated velocities and lined by weak seismicity constitutes the postulated Indian mantle indenter. We propose that the indenter delaminates and overturns the Asian slab, underthrusts the Tarim lithosphere along a compressive transform boundary, and controls the location and shape of the Pamir plateau.
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页数:11
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