Échange chromatographique de deux constituants indépendants entre un fluide aqueux et une solution solide à trois pôles ; application à la substitution Ca–Fe–Mn des grenats de skarn

Sedqui, Abderrahim; Guy, Bernard

doi:10.1016/s1251-8050(01)01535-x

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Additionally, they assumed growth of zones took place at constant pressure. Guy [1993] and Sedqui and Guy [2001] revised the Korzhinskii's theory of metasomatism with a more rigorous mathematical treatment identifying the development of metasomatic zones either as sharp shock waves or as spreading waves. An essential feature of these metasomatic models is the prediction of sharp metasomatic fronts due to the mass transport of major elements and local equilibrium assumptions between fluid and solid.…”

Section: Introductionmentioning

confidence: 99%

Coupling changes in densities and porosity to fluid pressure variations in reactive porous fluid flow: Local thermodynamic equilibrium

Malvoisin

Podladchikov

Vrijmoed

2015

Geochem Geophys Geosyst

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Mineralogical reactions which generate or consume fluids play a key role during fluid flow in porous media. Such reactions are linked to changes in density, porosity, permeability, and fluid pressure which influence fluid flow and rock deformation. To understand such a coupled system, equations were derived from mass conservation and local thermodynamic equilibrium. The presented mass conservative modeling approach describes the relationships among evolving fluid pressure, porosity, fluid and solid density, and devolatilization reactions in multicomponent systems with solid solutions. This first step serves as a framework for future models including aqueous speciation and transport. The complexity of univariant and multivariant reactions is treated by calculating lookup tables from thermodynamic equilibrium calculations. Simplified cases were also investigated to understand previously studied formulations. For nondeforming systems or systems divided into phases of constant density, the equations can be reduced to porosity wave equations with addition of a reactive term taking the volume change of reaction into account. For closed systems, an expression for the volume change of reaction and the associated pressure increase can be obtained. The key equations were solved numerically for the case of devolatilization of three different rock types that may enter a subduction zone. Reactions with positive Clapeyron slope lead to an increase in porosity and permeability with decreasing fluid pressure resulting in sharp fluid pressure gradients around a negative pressure anomaly. The opposite trend is obtained for reactions having a negative Clapeyron slope during which sharp fluid pressure gradients were only generated around a positive pressure anomaly. Coupling of reaction with elastic deformation induces a more efficient fluid flow for reactions with negative Clapeyron slope than for reactions with positive Clapeyron slope.

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Section: Introductionmentioning

confidence: 99%

Coupling changes in densities and porosity to fluid pressure variations in reactive porous fluid flow: Local thermodynamic equilibrium

Malvoisin

Podladchikov

Vrijmoed

2015

Geochem Geophys Geosyst

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“…of plurimodal distributions of the crystallized rock compositions. We already proposed in a preliminary way its application to magmatic rocks, in particular in open systems, as also did other authors (for example [2,5,10,11,12,14,21,24]). We want to give a more general approach (use o dimensionless parameters etc.)…”

Section: Introductionmentioning

confidence: 89%

Bimodal distribution of the solid products in a magmatic chamber: Modelling by fractional crystallization and coupling of the chemical exchanges with the differential melt/solid transport

Lakhssassi

Guy

Touboul³

et al. 2010

Comptes Rendus. Géoscience

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Répartition bimodale des produits solides d'une chambre magmatique : modélisation par cristallisation fractionnée avec couplage des échanges chimiques et du transport différentiel magma/solide Bimodal distribution of the solid products in a magmatic chamber: modelling by fractional crystallization and coupling of the chemical exchanges with the differential melt/solid transport

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“…The work of Korzhinskii considered classical dissolutionprecipitation reactions between multiple pure mineral phases and an aqueous solution. Hofmann [1972] applied chromatographic theory to binary ion exchange in feldspars and Sedqui and Guy [2001] explored ternary ion exchange during the formation of scarn garnets.…”

Section: Introductionmentioning

confidence: 99%

Reactive transport in a partially molten system with binary solid solution

Jordan

Hesse

2015

Geochem Geophys Geosyst

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Melt extraction from the Earth's mantle through high‐porosity channels is required to explain the composition of the oceanic crust. Feedbacks from reactive melt transport are thought to localize melt into a network of high‐porosity channels. Recent studies invoke lithological heterogeneities in the Earth's mantle to seed the localization of partial melts. Therefore, it is necessary to understand the reaction fronts that form as melt flows across the lithological interface between the heterogeneity and the ambient mantle. Here we present a chromatographic analysis of reactive melt transport across lithological boundaries, using the theory of hyperbolic conservation laws. This is an extension of linear trace element chromatography to the coupling of major elements and energy transport. Our analysis allows the prediction of the nonlinear feedbacks that arise in reactive melt transport due to changes in porosity. This study considers the special case of a partially molten porous medium with binary solid solution. As melt traverses a lithological contact, binary solid solution leads to the formation of a reacted zone between an advancing reaction front and the initial contact. The analysis also shows that the behavior of a fertile heterogeneity depends on its absolute concentration, in addition to compositional differences between itself and the refractory background. We present a regime diagram that predicts if melt emanating from a fertile heterogeneity localizes into high‐porosity channels or develops a zero porosity shell. The theoretical framework presented here provides a useful tool for understanding nonlinear feedbacks in reactive melt transport, because it can be extended to more complex and realistic phase behaviors.

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Échange chromatographique de deux constituants indépendants entre un fluide aqueux et une solution solide à trois pôles ; application à la substitution Ca–Fe–Mn des grenats de skarn

Cited by 3 publications

References 7 publications

Coupling changes in densities and porosity to fluid pressure variations in reactive porous fluid flow: Local thermodynamic equilibrium

Coupling changes in densities and porosity to fluid pressure variations in reactive porous fluid flow: Local thermodynamic equilibrium

Bimodal distribution of the solid products in a magmatic chamber: Modelling by fractional crystallization and coupling of the chemical exchanges with the differential melt/solid transport

Reactive transport in a partially molten system with binary solid solution

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