南海南沙海槽大型海底滑坡的发育特征及成因机制

任金锋; 孙鸣; 韩冰

doi:10.3799/dqkx.2020.185

Volume 46 Issue 3

Mar. 2021

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Ren Jinfeng, Sun Ming, Han Bing, 2021. A Giant Submarine Landslide and Its Triggering Mechanisms on the Nansha Trough Margin, South China Sea. Earth Science, 46(3): 1058-1071. doi: 10.3799/dqkx.2020.185

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Ren Jinfeng, Sun Ming, Han Bing, 2021. A Giant Submarine Landslide and Its Triggering Mechanisms on the Nansha Trough Margin, South China Sea. Earth Science, 46(3): 1058-1071. doi: 10.3799/dqkx.2020.185

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A Giant Submarine Landslide and Its Triggering Mechanisms on the Nansha Trough Margin, South China Sea

doi: 10.3799/dqkx.2020.185

Ren Jinfeng^{1, 2, 3
,
,},
Sun Ming^{3
,
,},
Han Bing³

1.
Gas Hydrate Engineering Technology Center, China Geological Survey, Guangzhou 510075, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2020-04-24
Publish Date: 2021-03-15

Abstract

Abstract

The research on large-scale submarine landslides is of great significance to understanding the stability of submarine slopes. In this paper, a giant submarine landslide on the Nansha trough margin, South China Sea was identified by using the latest high-precision multibeam bathymetry and reprocessed two-dimensional seismic data, and its development characteristics were described. The possible triggering mechanism was discussed. The landslide covers an area of 6 300 km², spanning 50 km and extending 140 km at most. The upper semicircular headwall domain has developed a basal shear surface and tilted fault blocks. The headwall scarp is 200-350 m high with an average slope of 0.7°. The middle arch-shaped translational domain has a erosional unconformity and voluminous remnant blocks. It is distributed in the depth section of 1 600-2 400 m with an average slope of 1°-3°. The lower fan-shaped toe domain has a detrital lobe deposit and some out-runner blocks. It is distributed in the water depth section of 2 400-2 800 m with an average slope of 0.1°-1.0°. The study indicates that the barrier of the rising anticline ridge to the sediment with high supply rate is an internal condition, but high flux upward fluids and gas hydrates dissociation may be two key preconditioning factors bringing anticlines closer to failure.
- submarine landslide,
- anticlinal ridge,
- gas hydrate dissociation,
- Nansha trough,
- marine geology

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References(50)

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A Giant Submarine Landslide and Its Triggering Mechanisms on the Nansha Trough Margin, South China Sea

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