Tectonic evolution and genetic mechanism of the Wan'an Basin, southern South China Sea

Yao Yongjian; L&#252; Caili; Wang Lijie; Xu Xing; Yang Chupeng; Yi Shantang

doi:10.3969/j.issn.0253-4193.2018.05.006

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Yao Yongjian, Lü Caili, Wang Lijie, Xu Xing, Yang Chupeng, Yi Shantang. Tectonic evolution and genetic mechanism of the Wan'an Basin, southern South China Sea[J]. Haiyang Xuebao, 2018, 40(5): 62-74. doi: 10.3969/j.issn.0253-4193.2018.05.006

Citation:

Yao Yongjian, Lü Caili, Wang Lijie, Xu Xing, Yang Chupeng, Yi Shantang. Tectonic evolution and genetic mechanism of the Wan'an Basin, southern South China Sea[J]. Haiyang Xuebao, 2018, 40(5): 62-74. doi: 10.3969/j.issn.0253-4193.2018.05.006

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Tectonic evolution and genetic mechanism of the Wan'an Basin, southern South China Sea

doi: 10.3969/j.issn.0253-4193.2018.05.006

1.
Guangzhou Marine Geological Survey, Guangzhou 510760, China
2.
CNOOC Research Institute, Beijing 100028, China
3.
CAS Key Laboratory of Oceanology and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2017-07-14
Rev Recd Date: 2017-10-08

Abstract

Abstract

Based on available seismic, well and regional geology data, tectonic subsidence and extension degree of the Wan'an Basin were calculated by balanced cross-section and backstripping techniques to reconstruct tectonic evolution history of the basin and further probe into its genetic mechanism. The results indicate that tectonic subsidence curves are composed of multiple-line sections and there exists differential subsidence in the northern and southern basin, and the subsidence center of the whole gradually shifts southward. Two subsidence centers developed in Late Eocene to Oligocene (37.8-23.0 Ma BP) and tectonic subsidence mainly concentrated in the middle and northern basin, while the southern part of the basin subsided rapidly in Early Miocene (23.03-16.0 Ma BP) and there exists three subsidence centers. However, tectonic subsidence has decreased since the Middle Miocene (~16.0-11.63 Ma BP) and the whole basin has entered into post-rift thermal subsidence stage. Basin extension is closely related to the seafloor spread of South China Sea and the stretching in the middle-northern basin is earlier than the southern basin. It is inferred that alternating sinistral to dextral strike-slip motions along the Wan'an Fault Zone control on the formation and evolution of Wan'an Basin, as a result of rifting and strike-slipping. The basin tectonic evolution is divided into four stages:initial rift, syn-rift, strike-slip reformation, and post-rift accelerated thermal subsidence stages.
- extension,
- tectonic evolution,
- Wan'an Basin,
- South China Sea

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References(56)

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