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Discovery and Its Significance of Earthquake Event Deposits of the Upper Triassic Bolila Formation in Mashuangbu,Biru County,Northern Tibet

LI Shang-lin1,WANG Gen-hou2,MA Bo-yong3,YANG Wen-rui2,ZHAO Wen-tao2,4,LIAO Lei2,41.National Geological Samples Center,The Ministry of Land and Resources,Beijing 101149,China2.Faculty of Earth Science and Resource,China University of Geosciences,Beijing 100083,China3.China Geological Library,Beijing 100083,China4.Inner Mongolia Institute of Geological Survey,Hohhot 010020,China  
Seinites,tsunamites and background deposits occur in the Upper Triassic Bolila Formation in Nanyaxiang Mashuangbu,Biru County,North Tibet.They are composed of three distinct sedimentary sequences: A-B-C,A-C and B-C,representing an event sedimentary sequence of earthquake-tsunami-background deposits,earthquake and background deposits(no tsunami occurring) and tsunami-background deposits(far from the center of earthquake) respectively.Earthquake event deposits in the Bolila Formation are not only the auspice of the further extension,splitting and separation of the Tethyan ocean,but also sedimentary response to the Laurasia land-Cathaysia splitting.
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