南海北部陆缘超伸展区白云凹陷断陷结构演化与岩浆作用

庞雄; 郑金云; 任建业; 王福国; 颜晖; 孙辉; 柳保军

doi:10.3799/dqkx.2022.064

Volume 47 Issue 7

Jul. 2022

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Pang Xiong, Zheng Jinyun, Ren Jianye, Wang Fuguo, Yan Hui, Sun Hui, Liu Baojun, 2022. Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea. Earth Science, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064

Citation:

Pang Xiong, Zheng Jinyun, Ren Jianye, Wang Fuguo, Yan Hui, Sun Hui, Liu Baojun, 2022. Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea. Earth Science, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064

Citation:

Pang Xiong, Zheng Jinyun, Ren Jianye, Wang Fuguo, Yan Hui, Sun Hui, Liu Baojun, 2022. Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea. Earth Science, 47(7): 2303-2316. doi: 10.3799/dqkx.2022.064

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Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea

doi: 10.3799/dqkx.2022.064

Pang Xiong^{1, 2
,
,},
Zheng Jinyun^{1, 2},
Ren Jianye³,
Wang Fuguo^{1, 2},
Yan Hui^{1, 2},
Sun Hui^{1, 2},
Liu Baojun^{1, 2}

1.
Shenzhen Branch of CNOOC Ltd., Shenzhen 518054, China
2.
CNOOC Deepwater Development Ltd., Shenzhen 518054, China
3.
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China

Received Date: 2021-12-05
Publish Date: 2022-07-25

Abstract

Abstract

The structure of faulted basins is mainly controlled by the tectonic action of boundary faults, but when magmatism occurs in different degrees during the development of basins, the structure of faulted basins will be significantly transformed and influenced. Based on the description and analysis of the differential evolution characteristics of fault depression structure in Baiyun Sag, Pearl River Mouth Basin, which is located in the northern margin of the South China Sea, in this paper it discusses the influence of the participation of magmatism on the structural style of the sag and the evolution of fault depression structure-stratum-sediment in the process of continental margin extension. The research shows that during the intense extension of the main depression in Baiyun Sag, magmatism was not obvious, brittle fracture occurred in the upper crust, and ductile extension thinning occurred in the middle and lower crust, resulting in the broad and deep fault depression controlled by crust-mantle detachment fault, and tectonism, namely, crustal extension detachment thinning, was the main mechanism of fault depression development. However, in the eastern depression of Baiyun Sag, after the early brittle fracture, a remarkable magmatic upwelling took place, which changed the structural strength of the upper crust, and the brittle-ductile transition plane moved upward, resulting in a broad and shallow fault depression controlled by the upper crust detachment fault. The fault depression structure was transformed by magmatic upwelling, showing a semi-graben system controlled by the slope-flat detachment fault, and the sedimentary center moved regularly. Tetconism and magmatism were the mechanism of fault depression development. The different degrees of magmatism participation between the main depression of Baiyun Sag and the eastern depression of Baiyun Sag not only led to the different structural styles and evolution process of the depression, but also the significant differences in the sedimentary filling system in the fault depression. In the broad and deep fault depressions that constitute the main depression of Baiyun sag, there were extremely thick strata of Upper Wenchang Formation-Enping Formation in the Middle and Late Eocene. In the gentle slope in the north and deep depression in the south, this stratum is composed of large delta system and deep lacustrine sedimentary system in turn. The eastern depression of Baiyun Sag was transformed by magma upwelling, which developed a broad-shallow fault depression with many uplifts and depressions, forming a small delta-shallow lake sedimentary system with several small sources, and the sediments were rich in pyroclastic rocks. The results are not only of great significance for the study of basin-forming mechanism in Baiyun Sag, and but also of important practical application value for oil and gas exploration in this sag.
- South China Sea,
- Baiyun Sag,
- broad and deep fault depression,
- broad and shallow fault depression,
- magma,
- crust-mantle detachment fault,
- upper crust detachment fault,
- petroleum geology

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References(47)

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Structural Evolution and Magmatism of Fault Depression in Baiyun Sag, Northern Margin of South China Sea

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