Some significances of studying north southern rift in Tibet plateau
HE Ri zheng ,GAO Rui(The Research Center of Lithospere, Chinese Academy of Geology Science, Beijing 100037, China)
A large numbers of near east west quaternary extensive structure, Rifts, which are active at present, form in the Tibet Plateau, although Tibet Plateau is strongly pressed from north south stress. Especially in the Lhasa Terrane before the collision arc where the press stress is most concentrated, there are many large scale rifts that regularly lay out. At present, many deep geophysical probings and geological surveys have been carried out in the Lhasa Terrane, such as Yadong Golm GGT, INDEPTH, and Sino France Cooperation etc. Maybe due to their scientific research object and viewings to Tibet then, those projects had not done research on the importance of the development environments of these rifts in Lhasa Terrane, as a whole, to uplift of Tibet plateau. Thus, some deep processes of rifts and its seed is nothing to be known. On the basis of the summary on presents achievements, the research on near north south quaternary rifts in south Tibet as a whole of lithopheric rheology, by integrated geophysics, and combined geology, tectonics and geochemistry etc, is helpful to understand rheological structure and deep geodynamic process which form rifts. Also, it is useful to know the whole geodynamic process of Tibet Plateau uplifting.