Mantle anisotropy across the southwestern boundary of the Ordos block, North China
Yongcai Tang1, Yongshun John Chen1, Yuanyuan V. Fu1, Haiyang Wang1, Shiyong Zhou1, Eric Sandvol2, Jieyuan Ning1, Yongge Feng1, Mian Liu2
1 Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China 2 Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA
Mantle anisotropy across the southwestern boundary of the Ordos block, North China
Yongcai Tang1, Yongshun John Chen1, Yuanyuan V. Fu1, Haiyang Wang1, Shiyong Zhou1, Eric Sandvol2, Jieyuan Ning1, Yongge Feng1, Mian Liu2
1 Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China 2 Department of Geological Sciences, University of Missouri, Columbia, MO 65211, USA
摘要Located at the northeastern margin of the Tibetan plateau, the Ordos block is a stable tectonic unit in North China. With its active boundary fault zones, the Ordos block played an important role in the eastward extrusion mechanism of the Tibetan plateau. Peking University deployed a linear array of 15 portable broadband seismometers across the western Weihe graben during September 2005 to August 2006 and later a 2-D seismic array (Southwest Ordos Array) of 14 portable broadband seismometers during 2007-2008 at its southwestern boundary. Analyses of shear wave splitting of SKS and SKKS phases at these stations show that the fast directions trend ~110° with an average delay time of 0.9 s in the southwestern margin of the Ordos block. The agreement between the lithosphere deformation indicated by GPS data and Quaternary fault slip-rate observations and the mantle flow represented by shear wave splitting implies that accordant deformation patterns from lithosphere to asthenosphere in relation to the eastward extrusion of the Tibetan plateau could extend at least to 200 km depth. Spatial distribution of splitting polarization directions indicates that the mantle flow driven by the Tibetan plateau is blocked by the Ordos block and locally restricted in a narrow channel along the Qinling-Dabie fault zones between the Ordos block and Sichuan basin.
Abstract：Located at the northeastern margin of the Tibetan plateau, the Ordos block is a stable tectonic unit in North China. With its active boundary fault zones, the Ordos block played an important role in the eastward extrusion mechanism of the Tibetan plateau. Peking University deployed a linear array of 15 portable broadband seismometers across the western Weihe graben during September 2005 to August 2006 and later a 2-D seismic array (Southwest Ordos Array) of 14 portable broadband seismometers during 2007-2008 at its southwestern boundary. Analyses of shear wave splitting of SKS and SKKS phases at these stations show that the fast directions trend ~110° with an average delay time of 0.9 s in the southwestern margin of the Ordos block. The agreement between the lithosphere deformation indicated by GPS data and Quaternary fault slip-rate observations and the mantle flow represented by shear wave splitting implies that accordant deformation patterns from lithosphere to asthenosphere in relation to the eastward extrusion of the Tibetan plateau could extend at least to 200 km depth. Spatial distribution of splitting polarization directions indicates that the mantle flow driven by the Tibetan plateau is blocked by the Ordos block and locally restricted in a narrow channel along the Qinling-Dabie fault zones between the Ordos block and Sichuan basin.
通讯作者:
Yongshun John Chen
E-mail: johnyc@pku.edu.cn
引用本文:
Yongcai Tang, Yongshun John Chen, Yuanyuan V. Fu, Haiyang Wang, Shiyong Zhou, Eric Sandvol, Jieyuan Ning, Yongge Feng, Mian Liu. Mantle anisotropy across the southwestern boundary of the Ordos block, North China[J]. 《地震学报》英文版, 2010, 23(6): 549-553.
Yongcai Tang, Yongshun John Chen, Yuanyuan V. Fu, Haiyang Wang, Shiyong Zhou, Eric Sandvol, Jieyuan Ning, Yongge Feng,Mian Liu. Mantle anisotropy across the southwestern boundary of the Ordos block, North China. Earthquake Science, 2010, 23(6): 549-553.
