南海共轭大陆边缘地壳结构及其类型特征

夏少红; 丘学林; 赵明辉; 夏戡原

doi:10.3799/dqkx.2011.092

Volume 36 Issue 5

Sep. 2011

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XIA Shao-hong, QIU Xue-lin, ZHAO Ming-hui, XIA Kan-yuan, 2011. Crustal Structure and Features in the Conjugate Margins of South China Sea. Earth Science, 36(5): 877-885. doi: 10.3799/dqkx.2011.092

Citation:

XIA Shao-hong, QIU Xue-lin, ZHAO Ming-hui, XIA Kan-yuan, 2011. Crustal Structure and Features in the Conjugate Margins of South China Sea. Earth Science, 36(5): 877-885. doi: 10.3799/dqkx.2011.092

XIA Shao-hong, QIU Xue-lin, ZHAO Ming-hui, XIA Kan-yuan, 2011. Crustal Structure and Features in the Conjugate Margins of South China Sea. Earth Science, 36(5): 877-885. doi: 10.3799/dqkx.2011.092

Citation:

XIA Shao-hong, QIU Xue-lin, ZHAO Ming-hui, XIA Kan-yuan, 2011. Crustal Structure and Features in the Conjugate Margins of South China Sea. Earth Science, 36(5): 877-885. doi: 10.3799/dqkx.2011.092

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Crustal Structure and Features in the Conjugate Margins of South China Sea

doi: 10.3799/dqkx.2011.092

CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China

Received Date: 2011-05-28
Publish Date: 2011-09-15

Abstract

Abstract

In order to analyze crustal structures and features in the conjugate margins of South China Sea (SCS), we collected large numbers of studied results from the ocean bottom seismometers experiments, onshore-offshore seismic experiments, gravity and magnetism anomalies.This paper firstly constructs three land-sea super cross-sections from east to west in the northern margin of SCS.The results show the onshore-offshore transitional zone is a border separating the unstretched and the stretched continental crust.The low velocity layer (LVL) in the middle crust was widely imaged in the unstretched continental crust.However, the high velocity layer (HVL) in the lower crust was detected in the stretched continental crust.By analyzing the mechanisms of the LVL in the middle crust and HVL in the base of crust, we believe the crustal structures had distinctly different attributes in the continental South China and in the northern SCS, which indicates that the littoral fault zone (LFZ) could be the boundary fault between them.Then, we reveal the crustal features in the Liyue Bank based on water depth, gravity and magnetism anomalies.The Moho depth thins from about 24 km in the Liyne bank to 11 km in the oceanic basin.The ocean-continent transitional zone generally widens from east to west in the southern margin.Finally, we devide the crustal structure in the conjugated margin of SCS into four types, including the unstretched continental crust, the stretched continental crust, the ocean-continent transitional zone, and the ancient ocean crust.
- South China Sea,
- conjugate margins,
- structural geology,
- ocean-continent transitional zone,
- marine geology

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References(51)

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