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《Chinese Journal of Geophysics》 2019-01
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Effects of plate interface geometry on the evolution of subduction

LIU MengXue;WEI DongPing;SHI YaNan;Key Laboratory of Computational Geodynamics,Chinese Academy of Sciences;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences;  
Subduction is one of focused issues since the establishment of the plate tectonics theory.In combination of geology,geophysics,laboratory physics experiments and numerical simulations,agreat deal of studies on this topic have been conducted.Most of previous work focus on the aspects of plates,mantle flow,motion and phase transition of materials during subduction,while one basic question how subduction begins remains unsolved.Meanwhile,due to the lack of data,the study of this problem,if any,is limited.In this paper,we choose three kinds of interface geometry,using finite element numerical models to simulate subduction.What we want to see here is whether and how the interface geometry of a plate affects subduction evolution.We build three kinds of models with different initial geometries,"dipping","vertical"and "bending".The results show that the plate interface geometry has an effect both on thesubducting plate and the trench depth.In the"dipping"model,subduction angle is the biggest,and both the subducting and trench depths are also the largest.The subducting angle and the trench depth in the"vertical"model are smaller only than those in the"dipping"model and the subducting depth is the smallest.The "bending"model has the smallest subducting angle and trench depth,but has a intermediate subducting depth in the three cases.It seems that there is a relationship between subducting angle and trench depth,that is,when subducting angle gets larger,the trench becomes deeper correspondingly.
【Fund】: 国家自然科学基金项目(41474086);; 中国科学院与国家外国专家局创新团队国际合作伙伴计划项目(KZZD-EW-TZ-19)资助
【CateGory Index】: P736
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