| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
SU Ming, WANG Yixuan, CHEN Hui, LIU Shan, XIE Xinong, ZHANG Xiaobo, CHANG Jinglong, MENG Fansheng, ZHOU Haitao, LUAN Kunxiang, ZHUO Haiteng, WANG Ce, LEI Yaping. Depositional mode for the seamount-terrace-canyon sedimentary combination under the impacts of intermediate and deep circulation dynamics in the northern margin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 61-73. doi: 10.16562/j.cnki.0256-1492.2023052201
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Depositional mode for the seamount-terrace-canyon sedimentary combination under the impacts of intermediate and deep circulation dynamics in the northern margin of the South China Sea
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Abstract
As a natural laboratory for studying energy and material exchange at water-rock interfaces, the northern slope area of the South China Sea possesses complex geomorphology, such as uplifted seamounts, flat terraces, and depressed canyons. It also develops various types of deep-water depositional systems, including gravity flow slides/slumps, turbidity currents, and contouritic deposits. Based on high-resolution bathymetry and seismic reflection data, CTD data, as well as published results from marine sedimentology and physical oceanic numerical simulations, this study focuses on analyzing the seamount-terrace-canyon sedimentary combination under intermediate and deep circulation bottom currents on the South China Sea northern margins. This study identifies the seamount-related moat-drift systems, the erosional/sheeted-nondepositional/seamount related contourite terraces, the plastered drifts, as well as the steep slopes with slides/slumps and canyons. This research reveals the coupling relationship between these deep-water sedimentary combinations and the hydrodynamic patterns among the intermediate and deep circulations. The findings obtained have significant implications for further understanding of the response of deep-water depositional processes to intermediate and deep circulation hydrodynamics and their impact on shaping continental margin morphology.
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References
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SU Ming, WANG Yixuan, CHEN Hui, LIU Shan, XIE Xinong, ZHANG Xiaobo, CHANG Jinglong, MENG Fansheng, ZHOU Haitao, LUAN Kunxiang, ZHUO Haiteng, WANG Ce, LEI Yaping. Depositional mode for the seamount-terrace-canyon sedimentary combination under the impacts of intermediate and deep circulation dynamics in the northern margin of the South China Sea[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 61-73. doi: 10.16562/j.cnki.0256-1492.2023052201
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Figure 1.
The diagnosis of seismic reflections of various erosive, non-depositional, and depositional features based on seafloor geometries and underlying architectures
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Figure 2.
Overview map of the northern part of the South China Sea (SCS) with various geographical domains (a) and comprehensive cross-seamount section on the Jianfeng Slope (b)
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Figure 3.
Distribution map of deep-water sedimentary systems (Left) and slope gradient map (Right) over the Jianfeng Slope
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Figure 4.
Distribution map of deep-water sedimentary systems (Left) and slope gradient map (Right) over the Yitong Slope
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Figure 5.
Depositional mode for the seamount-terrace-canyon sedimentary combination under the impacts of intermediate and deep circulation dynamics