Regional Background and Tectonic Evolution of East China Sea Basin

Zhao Zhigang; Wang Peng; Qi Peng; Guo Rui

doi:10.3799/dqkx.2016.045

Abstract：The East China Sea Basin that located in the front of the west Pacific subduction zone,is formed upon the Huanan Craton basement.The main sediment filling are from Late Cretaceous to Cenozoic.The East China Sea Basin developed on the thinned continental margin crust,is a back-arc rift basin caused by rifting and stretching that induced by ocean subduction, which is the part of the “trench-arc-basin”system in the west Pacific.The tectonic evolution was controlled by the uplift in the outer continental shelf that formed in the Late Cretaceous.The uplift is the complex of the continental margin uplift and accre-tionary wedge that disintegrated into Diaoyu Island fold belt and Ryukyu uplift after Miocene.Considering the study of the out-er continental shelf uplift,tectonic evolution history of the East China Sea basin after Late Cretaceous can be divided into three stages:the first stage,the Paleocene to Middle Late Eocene,formation and development of the western depression;the second stage,Middle Late Eocene to Oligocene,formation and development of the eastern depression,in which the rotary of the Pacific plate boundary in the Middle Late Eocene is the demarcation point of the tectonic migration of the eastern depression and west-ern depression;the third stage,Miocene-Holocene,impaction of the Philippine Sea Plate period,the original structure pattern of the East China Sea Basin began to decompose.