THREE DIMENSION PALEOTOPOGRAPHIC RECONSTRUCTION IN CENOZOIC TIBET PLATEAU
WANG Cheng shan 1, LIU Zhi fei 2, WANG Guo zhi 1, MIAO Fang 1, MA Zhi min 3, YI Hai sheng 1, LI Yong 1, LI Xiang hui 1, WEI Ming jian 4, LIU Shun 1, HUANG Da zhi 1 (1.Chengdu University of Technology, China; 2.Tongji University; 3
The collision of the Indian subcontinent with Eurasia was responsible for the rapid uplift, great changes of climate, environment, and topography in the Tibet plateau and nearby areas. This process was recorded by the basins developed simultaneously in marine, peripheral foreland basins and inner basins in plateau. They are in a relative closed or semi closed system between the range of uplift and erosion in plateau and the accumulation basin noticed as before. Hence, based on mass balance between erosion and sediment, the topography in the plateau in any time interval can be reconstructed, if sediments deposited in a catchment basin are distributed back to the erosion region in plateau as catchment surface of basin and distribution proportion. The uplift history, rates of uplift and denudation, altitude reaching after uplift can be revealed accurately by comparing paleotopography evolution in different time intervals, and the topics, such as the climate and environment influence caused by uplift, and plateau overgrown or shrink during collision, can be sought further .