【摘要】 藏北比如县玛双布上三叠统波里拉组发育震积岩(A)、海啸岩(B)及背景沉积(C)3个沉积单元。它们组成A-B-C,A-C,B-C等3种类型的沉积序列。这些沉积序列分别代表地震—海啸—背景沉积(地震引发海啸)、地震—背景沉积(地震未引发海啸)、海啸—背景沉积(远离地震中心)的事件沉积序列。波里拉组地震事件沉积是特提斯洋进一步扩张的前兆和裂解的标志,也是劳亚—泛华夏大陆裂解的响应。更多还原

【Abstract】 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.更多还原