Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea

Jialing ZHANG; Zhaocai WU; Chun-Feng LI; Hailong LI

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Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea

Geomorphology and geological structure of South China Sea | Updated：2024-10-12

- Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea
- Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea
- 海洋湖沼学报(英文) 2023年41卷第2期页码：630-643
- Affiliations：
  
  1.Key Laboratory of Submarine Geoscience, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  2.Department of Marine Science, Zhejiang University, Zhoushan 316021, China
  3.Sanya Institute, Zhejiang University, Sanya 572025, China
  4.Laboratory of Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  5.Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China
- Author bio：
  
  wuzc@sio.org.cn
- Funds：
  
  the National Natural Science Foundation of China(42076078;41776057;42176055);the Open Foundation of Key Laboratory of Submarine Geosciences, Ministry of Natural Resources(KLSG2004)
- DOI：
  中图分类号：
- 收稿：2022-01-30，
  
  纸质出版：2023-03-01
- Accepted：
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Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):630-643.

ZHANG Jialing,WU Zhaocai,LI Chun-Feng,et al.Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):630-643.
Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea[J]. 海洋湖沼学报(英文), 2023,41(2):630-643. DOI：

ZHANG Jialing,WU Zhaocai,LI Chun-Feng,et al.Gravity modelling of crustal architecture and heterogeneity in the Nansha Block, South China Sea[J].Journal of Oceanology and Limnology,2023,41(02):630-643. DOI：

摘要

Abstract

The stretched structure and heterogeneity of the crust of the Nansha Block

the southern continental margin of the South China Sea (SCS)

are not well understood. We used published ocean bottom seismic (OBS)/multichannel reflection seismic (MCS) profiles across the Nansha Block to establish five two-dimensional crustal structure models. Using gravity modelling with magnetic anomaly inversion

we obtained the distribution of density and local magnetic susceptibility of the crust. The models show that the distribution of density and thickness of the upper crust in the Nansha Block is uneven

and the thick upper crust is prevalent in the regions close to the continent-ocean transition (COT) showing different characteristics. The interpreted Mesozoic granite blocks and Precambrian rigid basement reflects the heterogeneity in the material composition of the SCS continental margin. Based on the thinning styles of different crustal layers

we suggest that the Nansha Block has a three-layer thinning pattern. The uppermost pre-rift layer was deformed via brittle fractures

the upper crust was sheared by discrete shear zones

and the lower crust experienced ductile deformation. The inherited pre-rift thermal regime

mechanical state

and material composition of the SCS continental margin affected the extensional structure of the crust.

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Keywords

references

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