T11F-04
Density and Magnetization Intensity of crust and uppermost mantle across Northern Margin of Tibetan Plateau
Monday, 14 December 2015: 08:45
302 (Moscone South)
Junmeng Zhao1, Xiankang Zhang2, Changli Yao3, Yisi Li4, Hongbing Liu1, Qiang Xu1, Heng Zhang1 and Gong Deng1, (1)ITP Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China, (2)Geophysical Exploration Center, China Earthquake Administration, Zhengzhou, China, (3)China University of Geosicences(Beijing), Beijing, China, (4)CEA China Earthquake Administration, Beijing, China
Abstract:
Recently, an integrated geophysical survey has been completed along a profile from Baicheng, Xinjing to Da Qaidam, Qinghai, China, which crosses the northern and eastern Tarim basin, the Altyn Tagh Range, and the Qaidam basin, respectively. Along the profile, a wide-angle seismic reflection/refraction profile with 9 shot points has been carried out to acquire P and S wave velocities. Based on the velocities and constrained by gravitational and geomagnetic anomalies, the density and magnetization intensity of the crust and uppermost mantle along the profile were determined through a joint inversion of gravity with geomagnetism. Using these data and combined with geological analyses we constructed a geodynamic model for northern margin of the Tibetan Plateau, which reveals a detailed structure of the crust and uppermost mantle, a deep tectonic setting of the superposed basins and a basin and range coupling mechanism.
