珠江口盆地西部陆缘伸展-减薄机制

毛云华; 赵中贤; 孙珍

doi:10.3799/dqkx.2019.160

Volume 45 Issue 5

May 2020

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Mao Yunhua, Zhao Zhongxian, Sun Zhen, 2020. Extensional Thinning Mechanism of the Western Continental Margin of the Pearl River Mouth Basin. Earth Science, 45(5): 1622-1635. doi: 10.3799/dqkx.2019.160

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Mao Yunhua, Zhao Zhongxian, Sun Zhen, 2020. Extensional Thinning Mechanism of the Western Continental Margin of the Pearl River Mouth Basin. Earth Science, 45(5): 1622-1635. doi: 10.3799/dqkx.2019.160

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Extensional Thinning Mechanism of the Western Continental Margin of the Pearl River Mouth Basin

doi: 10.3799/dqkx.2019.160

Mao Yunhua^{1, 3, 4
,
,},
Zhao Zhongxian^{1, 2, 3
,
,
,},
Sun Zhen^{1, 3}

1.
CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Science, Guangzhou 510301, China
2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China
3.
Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
4.
University of Chinese Academy of Science, Beijing 100049, China

Received Date: 2019-07-04
Publish Date: 2020-05-15

Abstract

Abstract

To understand the thinning process of the western margin of the Pearl River Mouth basin, structure analysis, quantitative calculation and comparison between fault growth rate and one-dimensional unloaded tectonic subsidence were carried out to study the structural deformation and migration characteristics. It is found that extensional structures controlled by listric and detachment faults are dominant and inherited. The fault activity and tectonic subsidence were concentrated in Kaiping sag in the first rifting stage, and the maximum rates reached 239 m/myr and 108.6 m/myr, respectively. The fault activity and tectonic subsidence migrated to the ocean basin in the second rifting stage, and the maximum rates reached 192 m/myr and 210.7 m/myr, respectively. In the first rifting stage, lithospheric thinning was dominated by brittle crust thinning. In the second rifting stage, lithospheric thinning center migrated oceanward, regional thinning and asthenosphere upwelling mitigated the subsidence in sagson shelf and slope, at the same time the lithosphere in the ocean basin area thinned rapidly till break-up happened. The upper crust thins faster than lower crust in the northern COT of the Southwest Sub sea basin, compared with the situation in its southern conjugate margin, where the upper crust is thick and the lower crust is thin or even absent, we suggest that the northwest sub-basin may have undergone asymmetric simple shear thinning before break-up happened.
- Pearl River Mouth basin,
- tectonic style,
- fault activity,
- tectonic subsidence,
- lithospheric break-up,
- tectonics

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Extensional Thinning Mechanism of the Western Continental Margin of the Pearl River Mouth Basin

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