Numerical Modeling of Mineral Precipitation in Seafloor Hydrothermal Circulation

被引：0
|
作者：
Guo Z. [1 ,2 ,3 ]
Chen C. [1 ,2 ]
Tao C. [3 ]
Hu Z. [1 ,2 ]
Xu S. [1 ,2 ]
机构：
[1] Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan
[2] Hubei Subsurface Multi-Scale Imaging Key Laboratory, China University of Geosciences, Wuhan
[3] Key Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography of MNR, Hangzhou
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 02期
关键词：
Black smoker; Geophysics; High-temperature venting; Mineral precipitation; Numerical simulation; Seafloor hydrothermal system;
D O I：
10.3799/dqkx.2019.959
中图分类号：
学科分类号：
摘要：
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 °C 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. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：729 / 742
页数：13
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