Canyon-related undulation structures in the Shenhu area, northern South China Sea

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• 作者：Shaohua Qiao ; Ming Su ; Zenggui Kuang ; Rui Yang…
• 关键词：Undulation structures ; Sediment waves ; Gravitational deformation ; Seafloor topography ; Submarine canyon ; Shenhu area ; South China Sea
• 刊名：Marine Geophysical Researches
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：36
• 期：2-3
• 页码：243-252
• 全文大小：3,820 KB
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• 作者单位：Shaohua Qiao (1) (2)
  Ming Su (1) (3)
  Zenggui Kuang (4)
  Rui Yang (1) (3)
  Jinqiang Liang (4)
  Nengyou Wu (1) (3)
  
  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong, China
  2. University of Chinese Academy of Sciences, Beijing, 100049, China
  3. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong, China
  4. Guangzhou Marine Geological Survey, Guangzhou, 510075, Guangdong, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Geophysics and Geodesy
  Geosciences
  Offshore Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-0581

文摘

The characteristics and origin of seafloor and subsurface undulations were studied in the Shenhu area, northern South China Sea using high-precision multibeam bathymetric map and high-resolution 2D seismic data. Two undulation structure fields associated with submarine canyons have been identified. One structure field is developed in canyon head areas and shows waveform morphology on the bathymetric map. The waves display wavelengths and wave heights of 1-?km and 20-0?m, respectively, generally occur on slopes from 1° to 5°, and extend for about 15?km approximately parallel to the canyon’s orientation. The other structure field is developed in the lower segment or mouth area of submarine canyons. In general, the waves display wavelengths and wave heights of 1.3-.6?km and 50-0?m, respectively, occur on slopes of approximately 2°, and extend for more than 20?km. Sediment cores from crests between submarine canyons in the lower segment include predominantly silts and clayey silts. Since undulations in the two fields show differences in morphology and internal architectures, two different formation mechanisms are suggested. Seafloor undulations in the head area of submarine canyons are interpreted as creep folds induced by soft sediment deformation. Undulation structures in the lower segment or the mouth area of submarine canyons are sediment waves constructed by turbidity currents overflows along the submarine canyons.