南海海盆区深部结构的不对称性及控制因素

丁航航; 丁巍伟; 张帆; 吴招才; 殷绍如; 方银霞

doi:10.3799/dqkx.2020.338

Volume 46 Issue 3

Mar. 2021

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Article Navigation > Earth Science > 2021 > 46(3): 929-941

Ding Hanghang, Ding Weiwei, Zhang Fan, Wu Zhaocai, Yin Shaoru, Fang Yinxia, 2021. Asymmetric Deep Structure of the South China Sea Basin and Its Controlling Factors. Earth Science, 46(3): 929-941. doi: 10.3799/dqkx.2020.338

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Ding Hanghang, Ding Weiwei, Zhang Fan, Wu Zhaocai, Yin Shaoru, Fang Yinxia, 2021. Asymmetric Deep Structure of the South China Sea Basin and Its Controlling Factors. Earth Science, 46(3): 929-941. doi: 10.3799/dqkx.2020.338

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Asymmetric Deep Structure of the South China Sea Basin and Its Controlling Factors

doi: 10.3799/dqkx.2020.338

Ding Hanghang^{1, 2
,
,},
Ding Weiwei^{1, 2, 3
,
,},
Zhang Fan⁴,
Wu Zhaocai²,
Yin Shaoru²,
Fang Yinxia²

1.
School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
2.
Key Laboratory of Submarine Geosciences & Second Institute of Oceanography, MNR, Hangzhou 310012, China
3.
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
4.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2020-10-21
Publish Date: 2021-03-15

Abstract

Abstract

The South China Sea basin has a complex tectonic evolutionary history, but the study of the asymmetry of deep structure and the control factors are still inadequate. The residual mantle Bouguer anomaly (RMBA) of the whole basin is calculated by using the latest gravity data collected from the South China Sea and the accurate sediment data based on the explanation of 27 seismic profiles. The crustal thickness of the basin is inverted, and the correlation analysis is carried out by using Crust1.0 data.The results show that there is obvious asymmetry in topography, RMBA and crustal thickness on each side of South China Sea basin, the north side has more sea mountains, lower RMBA value and thicker oceanic crust than the southern side. This apparent north-south asymmetry indicates a higher mantle temperature and more active magmatic activity on the north side, reflecting the asymmetry of the deep structure of the South China Sea. The asymmetry of this deep structure may be related to the southern jumping of the mid-ocean ridge. The mid-ocean ridge jumping resulted in partial melting between the old and new ridges, leading to higher mantle temperatures on the north side of the expansion center, as well as stronger magmatic activity, which showed more negative RMBA values, thicker oceanic crustal thickness and more after-expansion seamounts.
- South China Sea basin,
- crust thickness,
- residual mantle Bouguer anomaly,
- asymmetry,
- controlling factors,
- marine geology

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References(87)

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Asymmetric Deep Structure of the South China Sea Basin and Its Controlling Factors

doi: 10.3799/dqkx.2020.338

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