| Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern |
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| 作者姓名： | Li Jiabiao Jin Xiangiong Gaojinyao |
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| 作者单位： | Li Jiabiao，Jin Xiangiong，Gaojinyao1. Key Laboratory of Submarine Geosciences of State Oceanic Administration，Hangzhou 310012，China2. Second Institute of Oceanography，State Oceanic Administration，Hangzhou 310012，China |
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| 基金项目： | This study was supported by the National Major Fundamental Research，Development Project of China under contract No. G2000046704. |
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| 摘 要： | With processing and interpretation of 25 000 km full-coverage multibeam swath data fromthe eastern South China Sea, it is found that NE-trending and NW-trending linear morphological features such as scarps, horsts and grabens, govern the central part (14°- 17° N) of eastern subbasin. Compared with reflection seismic profiles, these NE-trending linear morpho-structures are considered to be the representation of basement structures on seabed and can be divided into three linear structural zones. The trend of the central zone is NE45°-50° occurring around extinct spreading center, the trend of the second zone is NE70° - 78° on both sides of the central one and the trend of the third zone is about NE60° just on the north of the second one. These three NE-trending linear zones are formed in late-stage NW - SE-trending seafloor spreading of the eastern subbasin along NW-trending linear faults, and respectively correspond to three spreading episodes: 17.0- 19.0 Ma (5d-5e), 19.0 - 21.0 Ma (5e-6a) and 21.0
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| 关 键 词： | Multibeam echosounding swath topography morpho-structures spreading pattern |
| 收稿时间： | 2001/9/13 0:00:00 |
| 修稿时间： | 2001/12/10 0:00:00 |
Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern |
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| Li Jiabiao,Jin Xiangiong,Gaojinyao.Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern[J].Acta Oceanologica Sinica,2002,21(1):77-85. |
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| Authors: | Li Jiabiao Jin Xiangiong and Gaojinyao |
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| Institution: | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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| Abstract: | With processing and interpretation of 25 000 km full-coverage multibeam swath data from the eastern South China Sea, it is found that NE-trending and NW-trending linear morphological featuressuch as scarps, horsts and grabens, govem the central part (14°～ 17° N) of eastern subbasin.Compared with reflection seismic profiles, these NE-trending linear morpho-structures are considered to be the representation of basement structures on seabed and can be divided into three linear structural zones. The trend of the central zone is NE45°～50° occurring around extinct spreading center, the trend of the second zone is NE70°～78° on both sides of the central one and the trend of the third zone is about NE60° just on the north of the second one. These three NE-trending linear zones are formed in late-stage NW-SE-trending seafloor spreading of the eastern subbasin along NW-trending linear faults, and respectively correspond to three spreading episodes: 17.0～19.0 Ma (5d-5e), 19.0～21.0 Ma (5e-6a) and 21.0～24.2 Ma (6a-6c) based on the contrast of morpho-structures to magnetic lineation anomalies. |
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| Keywords: | Multibeam echosounding swath topography morpho-structures spreading pattern |
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