| Li Jiabiao,Jin Xiangiong,Gaojinyao. 2002. Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern. Acta Oceanologica Sinica, (1):77－85 |
| Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern |
| Rifting characteristics of eastern subbasin of South China Sea and its spreading pattern |
| Received:September 13, 2001 Revised:December 10, 2001 |
| DOI： |
| Key words:Multibeam echosounding swath topography morpho-structures spreading pattern |
| 中文关键词: Multibeam echosounding swath topography morpho-structures spreading pattern |
| 基金项目:This study was supported by the National Major Fundamental Research; Development Project of China under contract No. G2000046704. |
| Author Name | Affiliation | | Li Jiabiao | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Jin Xiangiong | Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China | | Gaojinyao | 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 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 21.0~24.2 Ma (6a-6c) based on the contrast of morpho-structures to magnetic lineation anomalies. |
| 中文摘要: |
| 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 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 21.0~24.2 Ma (6a-6c) based on the contrast of morpho-structures to magnetic lineation anomalies. |
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