Eocene Tibetan Plateau And The Current Stress Field Between Two Study

India and Eurasia continental collision caused by the rise of the Tibetan Plateau since the last 100Ma Earth's history one of the most important geological events, it not only changed the topography around the world, forming an area of more than 2.5 million square kilometers, with an average elevation more than 5 km altitude, but also Asia and global climate change have a major impact. Proposal of the concept from the Tethys to the present concept of continental dynamics and the formation of global change, the Studies of Qinghai-Tibet Plateau has experienced enlightenment, the foundation, a large development to deepen the research stages, based on its two major scientific issues - Uplift History and uplift mechanisms attracted a great attention, although previous two issues have made this remarkable research results, but so far they still could not be completely resolved.he uplift history is concerned, it is considered a very poor capacity constraints, is seen in the early and late uplift uplift, uplift of the time from the Eocene to the Pliocene or even Pleistocene, the right lung l different understanding of history hindered understanding of the mechanism of the uplift of the plateau, since the Argand made after dozens of uplift mechanisms, including: subduction mode, pressing thicker model, continental extrusion model, lithospheric mantle convection model , polygenetic mode of action, have resulted in so many different uplift mechanisms of the main reasons is that they are built on the basis of the current plateau landscape, the lack of precise plateau uplift history constraints.Numerical simulation method of plateau uplift in the last 30 years developed a new method, this approach to elasticity, rheological model for the theory to the finite element method as a tool during the uplift of the plateau stress, strain analysis, trying to stress and strain changes of history constraints on the uplift of the plateau, and a variety of mechanisms to explain the uplift. Although this numerical simulation study for the plateau uplift our history has been greatly helped, but each model has its limitations, coupled with the existence of many physical parameters of large errors, or even difficult to obtain, Therefore, most of this simulation only as a qualitative understanding, does not have quantitative significance.In summing up the work of the previous numerical simulation based on the combined results of research of ancient continental reconstructions, using ANSYS finite element software on the plateau of Eocene and the present two simulation results of stress field of comparative analysis: Displacement vector from the distribution before and after the two point of view, the direction of displacement when a collision with just a clear deflection, nearly due north from the direction of favoring the North East, and some even due east to; from two Y direction Comparison of stress field of view, just a collision, the stress is the region mainly in the highlands of southwestern, western and northeastern parts, the performance of the current stress field distribution in the East constructed to bear the stress is relatively large; 2 X stress field changes direction more obvious in the northern part of the Altyn Tagh strike-slip fault current stress increases, the stress of the largest eastern tectonic knot; two principal stress direction also occurred a significant change, trends change and displacement vector the same time.