关键词: 沧东断裂, 铲状断裂, 裂陷过程

Abstract: The latest geological and geophysical data show that the Cangdong fault is a listric fault in the upper crust. The plane of the fault becomes a detachment plane at the 10km depth in the crust. The Cangdong fault has undergone two rifting processes in Mesozoic and Cenozoic time. It formed in late Jurassic as a normal fault, and became a thrust fault by the end of early Cretaceous. It was a normal fault in Eocene, evidenced by the Mesozoic structure, and controlled the distribution of stratum of early Tertiary. Palaeogene is the major active period for the Cangdong fault, the major character of the fault formed in this period. The fault's occurrence, development history and activity are different in different segments. The activity of the fault has been weak since Neogene. Based on the shallow seismic exploration, it is suggested that the Cangdong fault is not active since later Pleistocene on the whole and has little seismicity.

Key words: Cangdong fault, Listric fault, Rifting proces