Late Cenozoic Tectonic Deformation in the Dongsha Islands and Adjacent Sea Area
Dongsha Island and the adjacent sea area locate at the northern continental margin of the South China Sea (SCS), and is connected to the east by the Manila Trench. Analyses of seismic stratigraphy and gravity, magnetic and drilling wells data led to the discovery of three post-fault sequences (V, VI, VII). Extensive tectonic uplift, magma activity and erosion occurred in Dongsha Island and the adjacent area, where most of the faults in the northeastern SCS were still active during Pliocene and Quaternary. Two groups of faults trending NEE and NW were developed during Late Cenozoic. We conclude that three important tectonic movements, especially Dongsha movement (4.4-5.2 Ma) and Liuhua movement (1.4-1.89 Ma), controlled the structural framework in the Dongsha rise; whose deformation in the east is stronger than that in the west and whose stress field variation suggests that the tectonic uplift in the study area contributed to magmato-tectonic events correlated to the main collision phases between the East China and Taiwan 5-3 and 3-0 Ma ago.
作 者： 吴时国 刘展 王万银 郭军华 T.Lüdmann H.K.Wong 作者单位： 吴时国(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China)刘展(Ocean University of China, Qingdao 266003, China)
王万银(College of Engineering and Geodesy, Changan University, Xian, China)
郭军华(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China)
T.Lüdmann,H.K.Wong(Institute of Biogeochemistry, University of Hamburg, Hamburg, Germany)
刊 名： 中国海洋湖沼学报(英文版) ISTIC SCI 英文刊名： CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 年，卷(期)： 2003 21(4) 分类号： P73 关键词： Late Cenozoic tectonic movement seismic stratigraphy plate collision South China Sea