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《Chinese Journal of Geophysics》 2013-08
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Electrical resistivity structure of Longmenshan crust-mantle under sector boundary

WANG Xu-Ben 1,2,LUO Wei2,ZHANG Gang2,CAI Xue-Lin 2,3, QIN Qing-Yan4,LUO Hao-Zhong 2 1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology, Chengdu 610059,China 2 Key Lab of Earth Exploration and Information Techniques of Ministry of Education,Chengdu 610059,China 3 College of Earth Sciences,Cheugdu University of Technology,Cheugdu 610059,China 4 Xi′an Research Institute of China Coal Technology & Engineering Group Corp,Xi′an 710077,China  
A long peroid magnetotelluric profile along the Luqu-Longmenshan-Hechuan has been finished which helps to study the crust-mantle electrical resisitivity structure in Longmenshan and its adjacent area,Institutive and reasonable 2-D inversion algorithm under sector boundary was adopted.The results of this profile has shown the crust-mantle high resistance belt in Ruergai,Longmenshan,central Sichuan and low resistance belt in Songpan from northwest to southeast.Longmenshan crust-mantle high resistance block shows up as wedge-shaped high resistance block stretching to northwest under the Longmenshan thrust belt.Due to bi-directional compression of East margin of Qinghai-Tibet plateau and upper Yangtze plate,Crust materials of Songpan-Ganzi massifs thrust to Longmenshan,and middle-lower crust and upper mantle slides toward southwest,presenting a trend that west margin of upper Yangtze plate in shape of wedge inserting into east brim of Qinghai-Tibet Plateau.It was initially thought that Songpan crust-mantle ductile shear belt is regarded as the west margin deep boundary of upper Yangtze plate since Mesozoic-Cenozoic Era.
【Fund】: 国家自然科学基金重点项目(40839909);; 国家科技专项(SinoProbe-02-04);; 中国地质调查局项目(1212011220263)资助
【CateGory Index】: P319
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