Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records

Weilin Zhu; Yuchi Cui; Lei Shao; Peijun Qiao; Peng Yu; Jianxiang Pei; Xinyu Liu; Hao Zhang

doi:10.1007/s13131-021-1757-7

Volume 40 Issue 2

Apr. 2021

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Weilin Zhu, Yuchi Cui, Lei Shao, Peijun Qiao, Peng Yu, Jianxiang Pei, Xinyu Liu, Hao Zhang. Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records[J]. Acta Oceanologica Sinica, 2021, 40(2): 13-28. doi: 10.1007/s13131-021-1757-7

Citation:

Weilin Zhu, Yuchi Cui, Lei Shao, Peijun Qiao, Peng Yu, Jianxiang Pei, Xinyu Liu, Hao Zhang. Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records[J]. Acta Oceanologica Sinica, 2021, 40(2): 13-28. doi: 10.1007/s13131-021-1757-7

Citation:

Weilin Zhu, Yuchi Cui, Lei Shao, Peijun Qiao, Peng Yu, Jianxiang Pei, Xinyu Liu, Hao Zhang. Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records[J]. Acta Oceanologica Sinica, 2021, 40(2): 13-28. doi: 10.1007/s13131-021-1757-7

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Reinterpretation of the northern South China Sea pre-Cenozoic basement and geodynamic implications of the South China continent: constraints from combined geological and geophysical records

doi: 10.1007/s13131-021-1757-7

Weilin Zhu¹,
Yuchi Cui^{1, 2
,
,},
Lei Shao^{1
,
,},
Peijun Qiao¹,
Peng Yu¹,
Jianxiang Pei³,
Xinyu Liu³,
Hao Zhang¹

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
The Institute for Geoscience Research (TIGeR), School of Earth and Planetary Sciences, Curtin University, Perth 6845, Australia
3.
Hainan Energy Co., Ltd., CNOOC, Haikou 570145, China

Funds: The National Natural Science Foundation of China under contract Nos 42076066, 92055203 and 41874076; the National Science and Technology Major Project under contract Nos 2016ZX05026004-002 and 2017ZX05026005-005; the Fund of China Association for Science and Technology under contract No. 2018CASRQNJL18.

More Information

Corresponding author: E-mail: cuiyuchi@tongji.edu.cn; lshao@tongji.edu.cn
Received Date: 2019-11-20
Accepted Date: 2020-06-03

Available Online: 2021-04-02

Publish Date: 2021-04-02

Abstract

Abstract

The pre-Cenozoic northern South China Sea (SCS) Basin basement was supposed to exist as a complex of heterogeneous segments, divided by dozens of N−S faulting. Unfortunately, only the Hainan Island and the northeastern SCS region were modestly dated while the extensive basement remains roughly postulated by limited geophysical data. This study presents a systematic analysis including U-Pb geochronology, elemental geochemistry and petrographic identification on granite and meta-clastic borehole samples from several key areas. Constrained from gravity-magnetic joint inversion, this interpretation will be of great significance revealing the tectono-magmatic evolution along the southeastern margin of the Eurasian Plate. Beneath the thick Cenozoic sediments, the northern SCS is composed of a uniform Mesozoic basement while the Precambrian rocks are only constricted along the Red River Fault Zone. Further eastern part of the northern SCS below the Cenozoic succession was widely intruded by granites with Jurassic-to-early Cretaceous ages. Further western part, on the other hand, is represented by meta-sedimentary rocks with relatively sporadic granite complexes. To be noted, the western areas derived higher-degree and wider metamorphic zones, which is in contrast with the lower-degree and narrower metamorphic belt developed in the eastern region. Drastic collisions between the Indochina Block and South China continent took place since at least late Triassic, resulting in large-scale suturing and deformation zones. At the westernmost part of the northern SCS, the intracontinental amalgamation with closure of the Meso-Tethys has caused fairly stronger and broader metamorphism. One metamorphic biotite granite is located on the suturing belt and yields a Precambrian U-Pb age. It likely represents the relict from the ancient Gondwana supercontinent or its fringes. Arc-continental collision between the Paleo-Pacific and the southeast China Block, on the other hand, results in a relatively narrow NE–SW trending metamorphic belt during the late Mesozoic. Within the overall geological setting, the Cenozoic SCS oceanic basin was subsequently generated from a series of rifting and faulting processes along the collisional-accretionary continental margin.
- South China Sea,
- pre-Cenozoic basement,
- U-Pb geochronology,
- Paleo-Pacific subduction,
- intracontinental collision,
- metamorphic belt

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References(105)

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