Active Tectonics and Erosional Unloading at the Eastern Margin of the Tibetan Plateau  

作　　者：Alexander L. Densmore LI Yong Michael A. Ellis ZHOU Rongjun 

机构地区：[1]Institute of Geology, Department of Earth Sciences, ETH Zentrum, CH-8092 Zürich, Switzerland [2]National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China [3]Center for Earthquake Research and Information, University of Memphis, 3890 Central Avenue, Memphis, TN 38152, USA [4]Institute of Earthquake Engineering, Seismological Bureau of Sichuan Province, Chengdu 610041, China

出　　处：《Journal of Mountain Science》2005年第2期146-154,共9页山地科学学报（英文）

基　　金：supported by the NSF(EAR 9803484)to M.Ellis;A.Densmore,and NSFC(40372084);SZD0408 and EYTP to Li Yong

摘　　要：The eastern margin of the Tibetan Plateau is marked by an extremely steep mountain front with relief of over 5 km. This topography,coupled with abundant Mesozoic thrusts within the margin,explains why tectonic maps of the India-Asia collision typically show the eastern margin as a major thrust zone. Actually,it does not like that. Field observations suggest that the margin is better characterized as a zone of NNE-directed dextral shear with extensive strike-slip faulting and secondary thrusting. The high relief and steep gradients are partially explained by erosional unloading of an elastic lithosphere;the pre-erosion inherited topography may be the inherited Mesozoic thrust belt landscape modified by a component of Cenozoic tectonic shortening.

关 键 词：Tibetan Plateau TECTONIC erosional unloading FAULTING 

分 类 号：P931.2[天文地球—自然地理学]