海底热液循环中矿物沉淀过程数值模拟

郭志馗; 陈超; 陶春辉; 胡正旺; 许顺芳

doi:10.3799/dqkx.2019.959

Volume 46 Issue 2

Feb. 2021

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Article Navigation > Earth Science > 2021 > 46(2): 729-742

Guo Zhikui, Chen Chao, Tao Chunhui, Hu Zhengwang, Xu Shunfang, 2021. Numerical Modeling of Mineral Precipitation in Seafloor Hydrothermal Circulation. Earth Science, 46(2): 729-742. doi: 10.3799/dqkx.2019.959

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Guo Zhikui, Chen Chao, Tao Chunhui, Hu Zhengwang, Xu Shunfang, 2021. Numerical Modeling of Mineral Precipitation in Seafloor Hydrothermal Circulation. Earth Science, 46(2): 729-742. doi: 10.3799/dqkx.2019.959

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Numerical Modeling of Mineral Precipitation in Seafloor Hydrothermal Circulation

doi: 10.3799/dqkx.2019.959

Guo Zhikui^{1, 2, 3
,
,},
Chen Chao^{1, 2
,
,},
Tao Chunhui³,
Hu Zhengwang^{1, 2},
Xu Shunfang^{1, 2}

1.
Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Hubei Subsurface Multi-Scale Imaging Key Laboratory, China University of Geosciences, Wuhan 430074, China
3.
Key Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography of MNR, Hangzhou 310012, China

Received Date: 2019-03-18
Publish Date: 2021-02-15

Abstract

Abstract

To understand the mechanism of high-temperature hydrothermal system in highly permeable oceanic crust, a reactive hydrothermal convection model is proposed to solve mineral precipitation and its feedback on permeability. Mineral reaction of anhydrite, pyrite and chalcopyrite are accounted in the model. Precipitation and dissolution can be solved using solubility product of the mineral and transformed into permeability change. The results suggest that pyrite and chalcopyrite are precipitated as cap-like structure around 300-380℃ isotherm. With hydrothermal temperature increasing, the cap-like structure is moving to seafloor. Anhydrite is precipitated as chimney-like structure around focus flow by seawater heating and seawater-hydrothermal mixing. The low permeable chimney-like structure prevent seawater-hydrothermal mixing and thus keep hydrothermal at high temperature. Once the high-temperature focusing flow is formed, more metal can be dissolved in hydrothermal and be transported to shallow crust and seafloor. The numerical simulation results could help to understand the mechanism of high-temperature hydrothermal venting.
- seafloor hydrothermal system,
- high-temperature venting,
- numerical simulation,
- mineral precipitation,
- black smoker,
- geophysics

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致谢: 德国GEOMAR的Jörg Hasenclever博士和Lars H. Rüpke教授为本文的数值模拟提供了很多建设性的意见，Sebastian Fuchs博士为本文提供了黄铁矿和黄铜矿溶度积实验数据，在此表示诚挚的谢意！

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Numerical Modeling of Mineral Precipitation in Seafloor Hydrothermal Circulation

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