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《Progress in Geophysics》 2009-05
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Structure of crust and mantle beneath the Hu-bao basin and its adiacent resion

ZHANG Hong-shuang~1,TIAN Xiao-bo~1,LIU Fang~2,CAO Jing-quan~2,TENG Ji-wen~1(1.Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029, China;2. Seismological Bureau of Inner Mongolia Autonomy Region,Inner Mongolia,Hohhot 010051.China)  
Teleseismic receiver functions of seven seismic stations around the Hu-bao Basin indicate that crustal thickness of the region is 43-46 km with a normal crustal V_p/V_s ratio and S wave velocity. Lithospheric depth is 65 -85 km in the Yinshan tectonic zone with a lower average S wave veolocity, which shows a typical abnormal mantle. Based on S wave velocity structure and the negative correlation between crustal thickness and elevation, as well as the widespread basalt from mantle, we presume that upwelling of asthenospheric materials is one of the main reasons for uplift of the Yinshan orogen. The thinning of lithosphere and lower S wave velocity are attributed to metasomatism and erosion by the upwelling asthenosphere, while the formation of the Hu-bao Basin may be related to the extension caused by asthenosphere upwelling.
【Fund】: 中国科学院知识创新工程重要方向(KZCX3-SW-148);; 国家自然科学基金资助项目(40674048);; 中国科学院地学部咨询项目(2007)资助
【CateGory Index】: P313
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