The influence of mantle convection to the lithosphere deformation of China mainland
地幔对流拖曳力对中国大陆岩石层变形的影响

In this paper,by using the nonlinear power constitutive relationship of lithosphere, based on the ANSYS finite element method,we modeled the recent 0.2Ma ground movement and evolution of China mainland,and discussed the influence of the pressure from Indian plate and the drag force from the mantle convection on the surface deformation and motion of China mainland. The comparison of the modeling result and the observed data indicates that when considering the combined pressure from Indian plate and the drag force from the mantle convection,the ground movement of the whole east Asia region has a good consistency with the GPS observation;The stress environment caused by the collision with Eurasia and sustaining northward movemen of Indian plate plays an important role in the tectonic movement and the evolution of lithosphere in western China,but the influence diminishes gradually away from the Tibet plateau;the drag force from the mantle convection at the base of the lithosphere is a key force source to the tectonics and deformation of the lithosphere especially in the region far away from the collision zone of Indian-Himalaya.But there still exist some differences between the predicted result and GPS observation in the eastern China region near the western Pacific Ocean,due to the complicated structures and subduction zone in the east boundary of our model.This implies that a more reliable model and more driving forces should be considered in the future numerical modeling study on the deformation and movement of China mainland.