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《Chinese Journal of Geophysics》 2015-02
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Numerical simulation on process of the plume-lithosphere interaction

MENG Wei-Juan;CHEN Zu-An;BAI Wu-Ming;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Being the most likely cause of Large Igneous Provinces(LIPs),the study of plume has become a hot spot in earth sciences.In this paper,we perform numerical simulation of the process of plume-lithosphere interactions,and then analyze the effects of the crust′s rheological structure on this process.On the basis of mass,momentum and energy conservation equations,using finite element numerical method,we can obtain the temporal and spacial diagrams of the plume-lithosphere interactions.Based on non-Newtonian fluid approximation,making use of finite-element code"Ellipsis3D",we firstly perform numerical simulation of the process of plumelithosphere interactions.Secondly,with different models the effects of the crust′s rheological structure on this process are analyzed emphatically.Finally,the process of plume-lithosphere interactions in Emeishan Large Igneous Province(ELIP)is discussed.From the results of the numerical simulations,there are three stages in the process of the plume-lithosphere interactions.At the first stage,the plume ascends with the velocity of 2.75m·a-1during the first 0.2 Ma,and the surface topography on the top of plume begins to uplift;at the second stage,the plume ascends with the velocity of 0.83m·a-1 during 0.2Ma to 0.26 Ma,and the surface topography reaches the peak value;At last stage,after 0.26 Ma the plume begins to move horizontally with the velocity of 0.47 m·a-1 and the bottom of lithosphere begins shear deformation,and when shear deformation reaches a certain degree,the bottom of lithosphere begins to perform delamination.The rheological strength of the crust deeply influences the process of plume-lithosphere interactions.When the rheological strength of the lower crust is weaker,the upper crust′s rheological structure controls the degree of the uplift of surface topography.Otherwise,the rheological strength of the lower crust controls the degree of the subsidence of the both sides of the plume.In addition,the simulated results of Emeishan Large Igneous Province(ELIP)are in accordance with the previous results.The simulation results in this paper reflect the process of plume-lithosphere interactions and the effects of the crust′s rheological structure on this process better and more clearly.Because of the faults are widely distributed in Emeishan Large Igneous Province(ELIP),which are not considered in this paper,the further research looks forward to take the faults in to account.
【Fund】: 国家自然科学基金项目(41474083);; 中国科学院地球与行星物理重点实验室开放基金资助
【CateGory Index】: P542.5
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