FENG ShaoYing,
LI QiuSheng,
DENG XiaoJuan et al
.2020.Crustal skeleton structure of the lateral collision zone of the Qinghai-Tibet Plateau revealed by large-shot set of deep-reflecting profiling Chinese Journal of Geophysics(in Chinese),63(3): 828-839,doi: 10.6038/cjg2020N0271
Crustal skeleton structure of the lateral collision zone of the Qinghai-Tibet Plateau revealed by large-shot set of deep-reflecting profiling
FENG ShaoYing1, LI QiuSheng2, DENG XiaoJuan1, LI JingYuan4, XIONG XiaoSong3, LU ZhanWu2, LI WenHui2, WANG XiaoRan2, WU QingYu2, SHI JinHu1
1. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China; 2. Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. Deep Earth Exploration Center, Chinese Academy of Geological Sciences, Beijing 100037, China; 4. Southcentral Branch of Sinopec Geophysical Co., Ltd, Hunan Xiangtan 411104, China
Abstract：The southeastern margin of the Qinghai-Tibet Plateau is located on the flank of the collision between India and Eurasian plate. Revealing the lithospheric structure in this area is helpful to understand the deep dynamic process of the collision orogeny and crucial to construct the theoretical framework of continental collision metallogenesis. In this study, 15 large-shots data of a deep reflection seismic profile across the lateral collision zone of the Qinghai-Tibet Plateau were processed by static correction, denoising and single coverage stack imaging. The results show that the skeleton characteristics of the lithospheric structure in the lateral collision zone are:(1) Strong reflection (Tc) appearing between TWT 8 to 10 s divides the crust into upper and lower layers; Tc may be a large scale detachment surface in the crust, which decouples the deformation of the upper crust from the lower crust; (2) Moho discontinuity reflection (Tm) is a narrow-band reflection wave with 3~4 coaxial axes, discontinuous lateral traceability, and recognizable offset at the position of regional faults across; (3) There are two reflection wave groups (TL) dipping opposite each other beneath the Lanping-Simao massif at TWT21 s and TWT22~24 s beneath the western margin of Yangtze craton. The crustal structure skeleton composed of Tc, Tm and TL outlines briefly the hierarchical dynamic model of lithospheric mantle convergence, crustal block lateral slip and upper crust thin-skinned thrust or slip under the section. This deformation pattern of the lithosphere is obviously different from the "Gangdise model", which is dominated by forward collision, crustal shortening and vertical thickening.
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