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lithospheric thermal and compositional structure of South China jointly inverted from multiple geophysical observations

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Science China Earth Sciences 2021年第1期64卷 148-160页

作者： Bin SHAN Wanli ZHOU Yang XIAO Hubei Subsurface Multi-Scale Imaging Key Laboratory.Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China

The detailed lithospheric structure of South China is the basis for the understanding of tectonic processes of eastern ***,two essential issues in the study of lithospheric structure are the thermal and compositional structures,which are usually derived from either geophysical or geochemical ***,inversions from single geophysical or geochemical datasets have certain limitations,making it necessary to develop joint inversions of geophysical,geochemical and petrological *** this paper,through thermodynamic simulation and probabilistic inversion,we inverted multiple datasets including topography,geoid height,surface heat flow and surface wave dispersion curves for the 3D lithospheric thermal and compositional structure of South *** results reveal a thin(lithospheric mantle is primarily composed of saturated peridotite,indicating that the ancient refractory lithospheric mantle has been replaced by new *** dominant dynamic mechanism for lithospheric thinning in eastern South China may be the flat subduction of ancient Pacific slab,while thermal erosion may have also played a significant *** contrast,the LAB depth beneath the Sichuan Basin is much thicker(>200 km),suggesting that the thick and cold craton lithospheric roots are *** may exist a discontinuous interface beneath the Sichuan Basin,with the saturated lower layer thicker than the refractory upper *** a result,the lithospheric mantle of the Sichuan Basin and surrounding regions is mainly composed of saturated and transitional peridotite.

关键词： South China lithospheric thermal structure lithospheric compositional structure Thermodynamic inversion

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Numerical Analysis and Simulation Experiment of lithospheric thermal structures in the South China Sea and the Western Pacific

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Journal of China University of Geosciences 2009年第1期20卷 85-94页

作者：林舸彭美丽赵崇斌张露张德圣刘士林 Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Computational Geosciences Research Centre Central South UniversityChangsha 410083 China Centre for Earth Observation and Digital Earth Chinese Academy of SciencesBeijing 100101 China

The asthenosphere upwelled on a large scale in the western Pacific and South China Sea during the Cenozoic, which formed strong upward throughflow and caused the thermal structure to be changed obviously. The mathematical analysis has demonstrated that the upward throughflow velocity may have varied from 3×10^11 to 6×10^12 m/s. From the relationship between the lithospheric thickness and the conductive heat flux, the lithospheric heat flux in the western Pacific should be above 30 mW/m^2, which is consistent with the observed data. The huge low-speed zone within the upper mantle of the marginal sea in the western Pacific reflects that the upper mantle melts partially, flows regionally in the regional stress field, forms the upward heat flux at its bottom, and causes the change of the lithospheric thermal structure in the region. The numerical simulation result of the expansion and evolution in the South China Sea has demonstrated that in the early expansion, the upward throughflow velocity was relatively fast, and the effect that it had on the thickness of the lithosphere was relatively great,resulting in the mid-ocean basin expanding rapidly. After the formation of the ocean basin in the South China Sea, the upward throughflow velocity decreased, but the conductive heat flux was relatively high, which is close to the actual situation. Therefore, from the heat transfer point of view, this article discusses how the upward heat flux affects the lithospheric thermal structure in the western Pacific and South China Sea. The conclusions show that the upward heat throughflow at the bottom of the lithospheric mantle resulted in the tectonic deformation at the shallow crust. The intensive uplifts and rifts at the crust led to the continent cracks and the expansion in the South China Sea.

关键词： numerical analysis lithospheric thermal structure heat transfer South China Sea.

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