globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116859
论文题名:
Achieving complete reaction while the solid volume increases: A numerical model applied to serpentinisation
作者: Malvoisin B.; Podladchikov Y.Y.; Myasnikov A.V.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 563
语种: 英语
中文关键词: crystallisation pressure ; porosity clogging ; reaction rate ; serpentinisation ; solid volume increase ; tectonic deformation
英文关键词: Flow of fluids ; Numerical models ; Porosity ; Reaction rates ; Serpentine ; Tectonics ; Crystallization pressure ; Lower density ; Mantle rocks ; Porosity clogging ; Reaction front ; Reactions rates ; Serpentinisation ; Solid volume increase ; Solid volumes ; Tectonic deformations ; Deformation ; chemical reaction ; crystallization ; deformation ; fluid flow ; fracture ; numerical model ; overpressure ; porosity ; serpentinization ; volume change
英文摘要: Solid volume increases during the hydration of mantle rocks. The fluid pathways necessary to feed the reaction front with water can be filled by the low density reaction products. As a result, the reaction front dries out and the reaction stops at low reaction progress. This process of porosity clogging is generally predicted to dominate in reactive transport models, even when processes such as reaction-induced fracturing are considered. These predictions are not consistent with observations at mid-ocean ridges where dense mantle rocks can be completely replaced by low density serpentine minerals. To solve this issue, we develop a numerical model coupling reaction, fluid flow and deformation. High extents of reaction can only be achieved when considering that the increase in solid volume during reaction is accommodated through deformation rather than porosity clogging. The model can generate an overpressure that depends on the extent of reaction and on the boundary conditions. This overpressure induces viscoelastic compaction that limits the extent of the reaction. The serpentinisation rate is therefore controlled by the accommodation of volume change during reaction, and thus by deformation, either induced by the reaction itself or by tectonic processes. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165586
Appears in Collections:气候变化与战略

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作者单位: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France; ISTE-FGSE, Université de Lausanne, Quartier de la Mouline, Géopolis, Lausanne, CH-1015, Switzerland; Faculty of Mechanics and Mathematics, Moscow State University, Russian Federation

Recommended Citation:
Malvoisin B.,Podladchikov Y.Y.,Myasnikov A.V.. Achieving complete reaction while the solid volume increases: A numerical model applied to serpentinisation[J]. Earth and Planetary Science Letters,2021-01-01,563
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