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Deep water bottom current deposition in the northern South China Sea

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Abstract

There are some active bottom currents on the northern continental slope of the South China Sea (SCS). Reflection seismic profiles show that the bottom current channels occur in the water depth range of 1000 to 2700 m, extending from the NE to the SW, leading to accumulation of discontinuous drifts with higher sedimentation rates on the eastern side of the channel. The stacking pattern of the layers suggests that these drifts propagated southwestward, following the direction of the bottom currents. One sedimentary drift to the southeast of the Dongsha Islands has the highest sedimentation rate of 97cm/ka in the last 12 ka. The sedimentary characteristics of the sediment layers indicate that these bottom currents are most likley caused by the water movement of a branch of the West Pacific Ocean Current, which enters the northern SCS via the Bashi Strait. Once formed, the bottom currents transport sediments along the northern slope of SCS southwestward and finally disappear into the central basin of the SCS. Due to the bottom current activity, the deep-sea sedimentary process in the northern SCS is complex.

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Authors and Affiliations

  1. State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China

    Shao Lei, Geng JianHua & Qiao PeiJun

  2. Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou, 510075, China

    Li XueJie, Wang LiaoLiang & Wang HongBin

  3. CNOOC Ltd. Shenzhen, Shenzhen, 518067, China

    Pang Xiong & Lei YongChang

Authors
  1. Shao Lei
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  2. Li XueJie
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  3. Geng JianHua
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  4. Pang Xiong
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  5. Lei YongChang
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  6. Qiao PeiJun
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  7. Wang LiaoLiang
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  8. Wang HongBin
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Correspondence to Shao Lei.

Additional information

Supported by the National Natural Science Foundation of China (Grant Nos. 40276019 and 40238060) and the National Key Basic Research Special Foundation Project of China (Grant No. G2000078500)

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Shao, L., Li, X., Geng, J. et al. Deep water bottom current deposition in the northern South China Sea. SCI CHINA SER D 50, 1060–1066 (2007). https://doi.org/10.1007/s11430-007-0015-y

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  • DOI: https://doi.org/10.1007/s11430-007-0015-y

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