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DOI	10.1016/j.epsl.2021.116950
	Relative rates of fluid advection, elemental diffusion and replacement govern reaction front patterns
	Koehn D.; Piazolo S.; Beaudoin N.E.; Kelka U.; Spruženiece L.; Putnis C.V.; Toussaint R.
发表日期	2021
ISSN	0012821X
卷号	565
英文摘要	Replacement reactions during fluid infiltration into porous media, rocks and buildings are known to have important implications for reservoir development, ore formation as well as weathering. Natural observations and experiments have shown that in such systems the shape of reaction fronts can vary significantly ranging from smooth, rough to highly irregular. It remains unclear what process-related knowledge can be derived from these reaction front patterns. In this contribution we show a numerical approach to test the effect of relative rates of advection, diffusion, and reaction on the development of reaction fronts patterns in granular aggregates with permeable grain boundaries. The numerical model takes (i) fluid infiltration along permeable grain boundaries, (ii) reactions and (iii) elemental diffusion into account. We monitor the change in element concentration within the fluid, while reactions occur at a pre-defined rate as a function of the local fluid concentration. In non-dimensional phase space using Péclet and Damköhler numbers, results show that there are no rough fronts without advection (Péclet<70) nor if the reaction is too fast (Damköhler>10−3). As advection becomes more dominant and reaction slower, roughness develops across several grains with a full microstructure mimicking replacement in the most extreme cases. The reaction front patterns show an increase in roughness with increasing Péclet number from Péclet 10 to 100 but then a decrease in roughness towards higher Péclet numbers controlled by the Damköhler number. Our results indicate that reaction rates are crucial for pattern formation and that the shape of reaction fronts is only partly due to the underlying transport mechanism. © 2021 Elsevier B.V.
关键词	advection diffusion grain boundary network reaction front replacement roughness
英文关键词	Diffusion coatings; Diffusion in liquids; Grain boundaries; Porous materials; Reaction rates; Substitution reactions; Surface roughness; Weathering; Damkohler number; Elemental diffusion; Grain boundary network; Grain-boundaries; Porous medium; Reaction front; Relative rates; Replacement; Replacement reactions; Reservoir development; Advection; advection; aggregate; diffusion; grain boundary; infiltration; replacement; roughness; shape; Varanidae
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203170
作者单位	GeoZentrum Nordbayern, University Erlangen-Nuremberg, Schlossgarten 5, Erlangen, 91054, Germany; School of Earth and Environment, Institute of Geophysics and Tectonics, The University of Leeds, Leeds, LS2 9JT, United Kingdom; Universite de Pau et des Pays de l'Adour, E2S UPPA, LFCR, Pau, France; CSIRO - Deep Earth Imaging, 26 Dick Perry Ave, Kensington, WA 6151, Australia; RWTH Aachen University, Structural Geology, Tectonics and Geomechanics, Lochnerstraße 4-20, Aachen, Germany; Institut für Mineralogie, University of Münster, Corrensstrasse 24, Münster, 48149, Germany; School of Molecular and Life Science, Curtin University, Perth, 6845, Australia; Institut de Physique du Globe de Strasbourg, UMR 7516, Université de Strasbourg/EOST, CNRS, 5 rue René Descartes, Strasbourg Cedex, 67084, France; SFF PoreLab, the Njord Centre, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, Oslo, NO-0316, Norway
推荐引用方式 GB/T 7714	Koehn D.,Piazolo S.,Beaudoin N.E.,et al. Relative rates of fluid advection, elemental diffusion and replacement govern reaction front patterns[J],2021,565.
APA	Koehn D..,Piazolo S..,Beaudoin N.E..,Kelka U..,Spruženiece L..,...&Toussaint R..(2021).Relative rates of fluid advection, elemental diffusion and replacement govern reaction front patterns.Earth and Planetary Science Letters,565.
MLA	Koehn D.,et al."Relative rates of fluid advection, elemental diffusion and replacement govern reaction front patterns".Earth and Planetary Science Letters 565(2021).