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《Progress in Geophysics》 2017-06
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Numerical study on the dynamics of lithospheric deformation pattern in the northeastern Tibetan plateau

SUN Yu-jun;HU Dao-gong;ZHANG Huai;FAN Tao-yuan;ZHANG Yao-ling;LI Bing;SHI Yao-lin;Institute of Geomechanics,Chinese Academy of Geological Sciences;Key Laboratory of Computational Geodynamics,Chinese Academy of Sciences;Chinese Academy of Geological Sciences;  
The northeastern margin of the Tibetan plateau is the lateral expansion front of the Tibetan plateau. However,dynamic processes,such as lithospheric structure and strain localization,are still unclear. The lithospheric deformation pattern is critical to understand the dynamics of this region. In this study,taking the topography,lithospheric structure and heat flow as constraints,we discussed the effect of rheological contrasts on the lithospheric deformation. The results indicate that when the strength of mantle lithosphere is relatively high and the strength of crust is relatively low beneath this region,the crust is thickened under the continuous compression of the Tibetan plateau. The mantle lithosphere may subduct beneath the Tibetan plateau under the gravity of thickening crust. However,when the strength of mantle lithosphere is very high( rigid),the mantle lithosphere may not subduct beneath the Tibetan plateau. In this case,the plastic deformation focuses in the crust. When the lower crust of the Tibetan plateau has low viscosity and high velocity,the thickened lower crust may lead to the whole uplift of the Tibetan plateau. Thus,weak and high velocity lower crust plays an important role for the high and flat Tibetan plateau.However,the effect of lower crust in this case on the deformation of mantle lithosphere is limited.
【Fund】: 国家自然科学基金项目(41641039 41590860 41574090);; 中国地质调查项目(GZHL20120301 DD20160268-3)联合资助
【CateGory Index】: P31
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