Study on the influence of bathymetry on hydrothermal convection under mid-ocean ridges: Based on the spatial variation of overlying pressure of seawater

Fan Qingkai; Li Jianghai

doi:10.3969/j.issn.0253-4193.2020.09.007

Volume 42 Issue 9

Nov. 2020

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Fan Qingkai，Li Jianghai. Study on the influence of bathymetry on hydrothermal convection under mid-ocean ridges: Based on the spatial variation of overlying pressure of seawater[J]. Haiyang Xuebao，2020, 42(9)：61–68 doi: 10.3969/j.issn.0253-4193.2020.09.007

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Study on the influence of bathymetry on hydrothermal convection under mid-ocean ridges: Based on the spatial variation of overlying pressure of seawater

doi: 10.3969/j.issn.0253-4193.2020.09.007

Fan Qingkai^{1, 2
,},
Li Jianghai^{1, 2
,
,}

1.
MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2.
Institute of Oil and Gas, Peking University, Beijing 100871, China

Received Date: 2019-07-02
Rev Recd Date: 2019-12-09

Available Online: 2021-04-21

Publish Date: 2020-09-25

Abstract

Abstract

Hydrothermal venting systems mostly develop on the localized bathymetric highs of mid-ocean ridges with different spreading rates, and porous-elastic thermodynamic numerical models, which is filled with Darcian fluid can intuitively model the geometry, temperature structure and venting location of the hydrothermal systems in oceanic crust. Simulation results and the experimental-analytical model reveal that bathymetric highs with different sizes show a varied influence on the geometry of hydrothermal convection, the greater and wider bathymetric highs, the greater deflection of underlying plume to the bathymetric highs. Adopting the cross-axis bathymetry of the EPR 9°17′N and Lucky Strike hydrothermal fields into the model, our simulations produce vents fitting the realistic location of these two fields well. Finally, our schematic model for bathymetric relief deflecting underlying plumes indicates that the lower bathymetry and its underlying porous oceanic crust act as the main recharge zone, while the bathymetric high focuses the most of the discharge hot fluid due to the reduce of the overlying pressure of seawater.
- hydrothermal convection,
- numerical modelling,
- bathymetric relief,
- seawater pressure,
- Darcy’s law

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References(39)

References

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