南海北部东沙海底峡谷沉积演化过程及其地质意义

王星星; 蔡峰; 孙治雷; 李清; 李昂; 闫桂京; 孙运宝; 骆迪; 董刚

doi:10.3799/dqkx.2020.277

Volume 46 Issue 3

Mar. 2021

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Article Navigation > Earth Science > 2021 > 46(3): 1023-1037

Wang Xingxing, Cai Feng, Sun Zhilei, Li Qing, Li Ang, Yan Guijing, Sun Yunbao, Luo Di, Dong Gang, 2021. Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea. Earth Science, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277

Citation:

Wang Xingxing, Cai Feng, Sun Zhilei, Li Qing, Li Ang, Yan Guijing, Sun Yunbao, Luo Di, Dong Gang, 2021. Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea. Earth Science, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277

Citation:

Wang Xingxing, Cai Feng, Sun Zhilei, Li Qing, Li Ang, Yan Guijing, Sun Yunbao, Luo Di, Dong Gang, 2021. Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea. Earth Science, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277

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Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea

doi: 10.3799/dqkx.2020.277

Wang Xingxing^{1, 2
,
,},
Cai Feng^{1, 2
,
,},
Sun Zhilei^{1, 2},
Li Qing^{1, 2},
Li Ang^{1, 2},
Yan Guijing^{1, 2},
Sun Yunbao^{1, 2},
Luo Di^{1, 2},
Dong Gang^{1, 2}

1.
Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, CGS, Qingdao 266071, China
2.
Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China

Received Date: 2020-08-13
Publish Date: 2021-03-15

Abstract

Abstract

Based on high-resolution 2D multiple channel seismic data and multiple beams, this study investigated the sedimentary sequence, morphological features and depositional architectures of the Dongsha submarine canyon (DSC), to reveal the sedimentary evolution of the DSC and its geological significance in resources exploration. The results show that the upper segment of the DSC consists of six branches with widespread dendritic channels around the canyon heads, which have merged into two main branches at the middle segment. The middle segment of the DSC was initially formed at the late Early Miocene, when the canyon was confined between the tectonic uplift and igneous body. The upper segment of the DSC has begun to extend landwards since the Late Miocene; the formation of the upper-segment branches and dendritic channels at the canyon heads was significantly influenced by faults and strong bottom currents, respectively. The evolution of the DSC could be divided into three stages: (1) The initial development stage from late Early Miocene-Middle Miocene, (2) the expansion stage in Late Miocene, and (3) the modern development stage from Pliocene-present. Since the Late Miocene, the DSC has provided Manila trench with a great amount of organic-rich sediments, which are important materials for producing gas hydrates in the accretionary wedge of the Manila subduction zone.
- Dongsha submarine canyon,
- sedimentary evolution,
- tectonic activity,
- northern South China Sea,
- marine geology

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