上地幔含水量对海底扩张过程中洋壳厚度的影响：数值模拟

邵佳; 许鹤华; 谌永强; 施小斌; 王晓芳

doi:10.3799/dqkx.2020.336

Volume 46 Issue 3

Mar. 2021

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Shao Jia, Xu Hehua, Shen Yongqiang, Shi Xiaobin, Wang Xiaofang, 2021. The Effect of Water Content in the Upper Mantle on the Oceanic Crustal Thickness during Seafloor Spreading: Numerical Modeling. Earth Science, 46(3): 826-839. doi: 10.3799/dqkx.2020.336

Citation:

Shao Jia, Xu Hehua, Shen Yongqiang, Shi Xiaobin, Wang Xiaofang, 2021. The Effect of Water Content in the Upper Mantle on the Oceanic Crustal Thickness during Seafloor Spreading: Numerical Modeling. Earth Science, 46(3): 826-839. doi: 10.3799/dqkx.2020.336

Citation:

Shao Jia, Xu Hehua, Shen Yongqiang, Shi Xiaobin, Wang Xiaofang, 2021. The Effect of Water Content in the Upper Mantle on the Oceanic Crustal Thickness during Seafloor Spreading: Numerical Modeling. Earth Science, 46(3): 826-839. doi: 10.3799/dqkx.2020.336

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The Effect of Water Content in the Upper Mantle on the Oceanic Crustal Thickness during Seafloor Spreading: Numerical Modeling

doi: 10.3799/dqkx.2020.336

Shao Jia^{1, 3
,
,},
Xu Hehua^{1, 2
,
,},
Shen Yongqiang^{1, 3},
Shi Xiaobin^{1, 2},
Wang Xiaofang^{1, 2}

1.
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 511458, China
2.
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2020-08-30
Publish Date: 2021-03-01

Abstract

Abstract

Different contents of water in the mantle have significant effects on the formation of oceanic crust. However, how the homogeneous and local hydrous mantle with different water contents will affect the thickness of oceanic crust are also not clear. Thus we conduct numerical simulations to represent the process of formation. Results show that, in the homogeneous hydrous models, the higher the water content in the upper mantle is, the smaller the maximum melt fraction, the deeper the initiation melting and the bigger melting area will be, finally leading to larger melt volume and the thicker oceanic crust. And in the local hydrous models, the melt of local hydrous mantle can also increase the thickness of oceanic crust, however, the initial time of the effect will depend on its water content. Combining with the characteristics of oceanic crust of the South China Sea, we suggest that the water content in the mantle source during the opening of South China Sea is heterogeneous.The oceanic crustal thickness in eastern sub-basin is 1 km thicker than that of the southwestern sub-basin, possibly because the overall water content of the former is higher than the latter (about 50×10^-6, according to our model). And carbonated silicate melts in the basalt of South China Sea may be carried out from deep by the melt which the local hydrous mantle produce in the deep. Moreover, the oceanic crustal thickness does not change greatly with time, which may be due to the volume of the local hydrous mantle is small or the volume is large but its water content is not significantly higher than that in the background.
- water content in the upper mantle,
- oceanic crustal thickness,
- seafloor spreading,
- South China Sea,
- numerical modelling,
- marine geology

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References(44)

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The Effect of Water Content in the Upper Mantle on the Oceanic Crustal Thickness during Seafloor Spreading: Numerical Modeling

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