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Areomagnetic Anomaly of Subtle East-West Striking Faults in the Central Tibet and Its Significance

HE Ri-zheng1,2,GAO Rui1,ZHENG Hong-wei31.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China2.Geo-detection Laboratory,Ministry of Education of China,China University of Geosciences,Beijing 100083,China3.School of Earth and Space Sciences,Peking Universtiy,Beijing 100871,China  
To study regional tectonics in the mid-western Tibet plateau, the data of areomagnetic anomaly suveryed from 1998 to 2000 is reprocessed by upward continuation method.The results of diffe-rent upward continuation levels reveal a significant anomaly of a subtle fault which located between the northern margin of Lhasa terrane and south side of Banggonghu-Nujing Suture,about along Geji North to Gaze South to Cuoqen North to Shenza North,from west to east.Combined with other results,this subtle fault,together with Jiali strike-slip fault,forms a large-scale E-W strike-slip fault in the central Tibet.And the conclusion is also supported by other evidences from surface geology,geophysics and modeling.The E-W strike-slip faults control the force distribution and deformation within Tibet plateau.
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