中沙海槽盆地构造与沉积作用及其对远端裂陷盆地演化的启示

汪斯毓; 王仕胜; 刘艳锐; 吴时国

doi:10.3799/dqkx.2021.067

Volume 47 Issue 3

Mar. 2022

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Wang Siyu, Wang Shisheng, Liu Yanrui, Wu Shiguo, 2022. Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin. Earth Science, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067

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Wang Siyu, Wang Shisheng, Liu Yanrui, Wu Shiguo, 2022. Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin. Earth Science, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067

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Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin

doi: 10.3799/dqkx.2021.067

Wang Siyu^{1
,
,},
Wang Shisheng¹,
Liu Yanrui²,
Wu Shiguo^{2
,
,}

1.
Haikou Marine Geological Survey Center, China Geological Survey, Haikou 571127, China
2.
Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China

Received Date: 2021-05-23
Publish Date: 2022-03-25

Abstract

Abstract

The basin evolution in distal rifting margin has been hotspot in the continental margin scientific planning. Zhongsha trough basin located between the Northwest Sub-Basin and Southwest Sub-Basin is a typical distal rifting basin nearby the ocean basin. In this study, the seismic sequence and tectonic have been unraveled based on the newly collected geophysical data. The basin has been filled with sediments of 200-1 500 m in thickness and 6 identified seismic sequences. Eogene sequence is limited at trough center; while Neogene sequence covered in the whole basin with thickness of 200-1 100 m. Quaternary sedimentary layer is thin hemipelagic deposits. The distal basin has three characters as follows. (1) Intensive magma activity occurred in the whole basin. It was characterized by a large amount of igneous intrusion and eruption on the seismic sections. (2) the rifting basin located over acoustic basement. It has magmatic feature and varied at 6.0-10.4 km buried depth. (3) Buried depth of Moho varies between 15 and 24 km. It is thinner seaward and thick to coral reefal islands. The tectonic deformation is characterized by rifting structures which included NE-SW and NW-SE trending faults, of which the NE-SW striking faults controlled the Cenozoic depression development.
- seismic sequence,
- acoustic basement,
- distal rifting basin,
- tectonic evolution,
- Xisha uplift,
- South China Sea,
- marine geology

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Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin

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