| Late Cenozoic Tectonic Deformation in the Dongsha Islands and Adjacent Sea Area |
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| 作者姓名： | 吴时国 刘展 王万银 郭军华 T.Lüdmann H.K.Wong |
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| 作者单位： | [1]InstituteofOceanology,ChineseAcademyofScietwes,Qingdao266071,China [2]OceanUniversityofChina,Qingdao266003,China [3]CollegeofEngineeringandGeodesy,ChanganUniversity,Xian,China [4]InstituteofBiogeochemistry,UniversityofHamburg,Hamburg,Germany |
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| 基金项目： | FinancialsupportforthisresearchwasprovidedbytheMinistryofScienceandTechnologyProject(G2 0 0 0 4670 4)，Knowledge
InnovationProjectoftheInstituteofOceanologyoftheChineseAcademyofSciences，andtheFundoftheDirectoroftheChinese
AcademyofSciences ( 2 0 0 1 |
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| 摘 要： | 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.
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| 关 键 词： | 晚新生代 构造形变 东沙群岛 邻近海域 地震地层学 地心引力 南海 |
| 收稿时间： | 22 October 2002 |
| 修稿时间： | 12 January 2003 |
Late cenozoic tectonic deformation in the Dongsha Islands and adjacent sea area |
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| Wu Shiguo,Liu Zhan,Wang Wanyin,Guo Junhua,T. Lüdmann,H. K. Wong.Late Cenozoic Tectonic Deformation in the Dongsha Islands and Adjacent Sea Area[J].Chinese Journal of Oceanology and Limnology,2003,21(4):377-388. |
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| Authors: | Wu Shiguo Liu Zhan Wang Wanyin Guo Junhua T Lüdmann H K Wong |
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| Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 266071 Qingdao, China;(2) Ocean University of China, 266003 Qingdao, China;(3) College of Engineering and Geodesy, Changan University, Xian, China;(4) Institute of Biogeochemistry, University of Hamburg, Hamburg, Germany;(5) Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | 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. |
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| Keywords: | Late Cenozoic tectonic movement seismic stratigraphy plate collision South China Sea |
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