南海西南次海盆地壳岩石圈伸展破裂过程的构造、沉积和岩浆作用记录

任建业; 罗盼; 高圆圆; 王后金; 雷超; 巢鹏

doi:10.3799/dqkx.2022.135

Volume 47 Issue 7

Jul. 2022

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Ren Jianye, Luo Pan, Gao Yuanyuan, Wang Houjin, Lei Chao, Chao Peng, 2022. Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea. Earth Science, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135

Citation:

Ren Jianye, Luo Pan, Gao Yuanyuan, Wang Houjin, Lei Chao, Chao Peng, 2022. Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea. Earth Science, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135

Citation:

Ren Jianye, Luo Pan, Gao Yuanyuan, Wang Houjin, Lei Chao, Chao Peng, 2022. Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea. Earth Science, 47(7): 2287-2302. doi: 10.3799/dqkx.2022.135

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Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea

doi: 10.3799/dqkx.2022.135

Ren Jianye^{1, 2
,
,},
Luo Pan³,
Gao Yuanyuan²,
Wang Houjin^{1, 4},
Lei Chao^{1, 2},
Chao Peng²

1.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
2.
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China
3.
SINOPEC Geophysical Research Institute, Nanjing 211103, China
4.
Guangzhou Marine Geological Survey of Ministry of Natural Resources, Guangzhou 511458, China

Received Date: 2022-03-20
Publish Date: 2022-07-25

Abstract

Abstract

Based on the interpretation and analysis of 1 000 km long deep reflection seismic sections across the conjugate passive continental margins in the V-shaped tip of the Southwest sub-basin of the South China Sea, in this paper it presents a study on the basin structure, tectonic style and the extension progress of continental lithosphere in the final breakup area of South China Sea. Three first order surfaces can be recognized in the SW South China Sea: seafloor, Tg/Tm and Moho. The relationship between these three surfaces can be used to define the box-shape domain, necking domain, wedge shape domain and thin box-shape domain. In the V-shaped SW sub-basin, T50/Tm corresponds to the lithosphere breakup surface, which is also named as the breakup unconformity. This interface and the basement surface (Tg/Tm) define the syn-rifting deposition filling sequence of the continental margin basin. Two important episodic structures, T70 and T60, have developed within it. The surfaces of Tg and T70 constrained the formation of early faulted basin system which was controlled by high-angle normal faults. The surfaces of T70 and T60 controlled the development of detachment basin. The surfaces of T60 and T50 constrained the formation of sag basins. In this paper it shows that the thin box-shape domain belongs to the proto-oceanic domain. The nature of this area consists of magmatic ocean, representing the final breakup process before the formation of mantle convection system in which the lithosphere was close to disintegration and separation, but the steady-state seafloor spreading had not been fully established. The thin box-shape domain developed between the T60 and Tm. Considering the initial crustal thickness, fault activity, and basin prototypes during different periods, and applying the balanced profile technology, the development progress of V-shaped tip at the SW sub-basin has been reconstructed. The structure-stratigraphic-magma interaction model of the final breakup domain in the SW sub-basin of the South China Sea has been established, revealing the extension and breakup mechanism of the continental margin lithosphere in the South China Sea. This mechanism has important theoretical significance, and has great practical application value for deep-water oil and gas exploration in the South China Sea.
- South China Sea,
- final breakup area,
- southwest sub-basin,
- detachment fault,
- extension breakup model,
- marine geology

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References(48)

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Structural, Sedimentary and Magmatic Records during Continental Breakup at Southwest Sub-Basin of South China Sea

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