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

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Abstract

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 1–2 km and 20–50 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 1.3–3.6 km and 50–80 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.

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Acknowledgments

This study is supported by the National Natural Science Foundation of China (Nos. 41202080 and 41206047), the PetroChina Innovation Foundation (No. 2013D-5006-0105), and the National High Technology Research and Development Program (863 project) (2013AA0925010202). We are grateful to GMGS for permission to publish this material. Many thanks to Dr. WeiWei Ding for generoushly providing us the high-resolution bathymetric map. We are grateful to the anonymous reviewers for the thorough reviews and constructive comments.

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Authors and Affiliations

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong, China

    Shaohua Qiao, Ming Su, Rui Yang & Nengyou Wu

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Shaohua Qiao

  3. Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong, China

    Ming Su, Rui Yang & Nengyou Wu

  4. Guangzhou Marine Geological Survey, Guangzhou, 510075, Guangdong, China

    Zenggui Kuang & Jinqiang Liang

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  1. Shaohua Qiao
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Correspondence to Nengyou Wu.

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Qiao, S., Su, M., Kuang, Z. et al. Canyon-related undulation structures in the Shenhu area, northern South China Sea. Mar Geophys Res 36, 243–252 (2015). https://doi.org/10.1007/s11001-015-9252-1

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