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《Earth Science Frontiers》 2006-05
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The electrical structure and fault feature of crust of south-eastern Tibetan plateau—the result of magnetotelluric prospecting on profile from Xiachayu-Changdu

JIN Sheng 1,2,YE Gao-feng 1,2,WEI Wen-bo 1,2,DENG Ming 1,2,Martyn UNSWORTH 31.Geo-detection Laboratory,Ministry of Education of China,China University of Geosciences,Beijing 100083,China 2.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China 3.University of Alberta,Edmonton,Canada  
From broad band magnetotelluric data along a profile from Xiachayu to Changdu south-eastern Tibetan plateau,the electrical structure and the fault feature of crust of south-eastern Tibet plateau have been inferred,The results show that there are many high resistive bodies of varied sizes widely distributed in the upper crust along the profile,with resistivity arranging from 90 to 3 000 Ω·m;the lower surface of this high resistive layer is to the depth of 5-30 km;and its thickness increases from South to North.Beneath the high resistive layer,there exits a conductive layer with resistivity less than 10 Ω·m,which is composed of individual conductive bodies.Compared to the conductive bodies existing in the middle and northern Tibetan plateau,the scale of these conductive bodies is smaller,and the depth to the lower surface is shallower.Along the profile,there are a series of lateral electrical gradient zones or distortion zones of different scale and different attitude,indicating the distribution of faults in the upper crust.A comparison of the magnetotelluric data with gravity data shows that both gravity lows and negative isostasy gravity anomalies correspond to all the main electrical gradient zones.An integration of the magnetotelluric data and regional geology infers the locations and structures of the main zones of faults including the Jiali-Ranwu,Bangong-Nujiang and Jasangka-Chibuzhangcuo fractures.The study is of significance for better understanding collision and thrusting between the Indian and Asian plate.
【Fund】: 国家自然科学基金资助项目(40404006);; 教育部科学技术研究重大项目(重大0211)
【CateGory Index】: P631.3
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