RESEARCH ON BRITTLE-DUCTILE TRANSITION PLANE OF CRUST OF TIBETAN PLATEAU
Yang Qiang 1,2) ; and Dang Yamin 1,2,3)
1)School of Geodesy and Geomatics, Wuhan University, Wuhan 4300792)Institute of Geodesy and Geodynamic, Chinese Academy of Surveying and Mapping, Beijing 1000393)Shandong University of Science and Technology, Qingdao 266510
Abstract The crust of the Tibetan plateau and its adjacent area is divided into two layers: the elastic brittle layer and the viscoelastic ductile layer, and then the interior temperature field of the crust by steady heat conductive equation is evaluated.Further, under the condition that fracture intensity is equal to creeping intensity, brittleductile transition plane is obtained by use of Crust2.0 earth model. The results show that brittleductile transition plane locates in middle crust about 20-35 km depth generally. The thicker the crust is, the deeper the transition floor is. Effective viscosity of transition plane located in Tibetan plateau is between
10 19-10 22 Pas, temperature field is between 450-600℃.
