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An ideal solid solution model for calculating solubility of clay minerals

Published online by Cambridge University Press:  09 July 2018

Y. Tardy  and
B. Fritz
Y. Tardy
Affiliation:
Laboratorie de Pédologie et de Géochimie, 38, rue des Trente Six Ponts, 31078 Toulouse
B. Fritz
Affiliation:
Centre de Sédimentologie et de Géochimie de la Surface, 1, rue Blessig, 67084 Strasbourg, France
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Abstract

A method for estimating Gibbs free energies and stabilities of clay minerals is proposed for use with computer programs aimed at calculating the chemical evolution of natural water-rock systems. This is based on (i) a model for ideal solid solutions of a large number of end-member compositions and (ii) a data set of estimated solubility products from 36 end-members. The application of the method to the production of experimental or natural clay stabilities is discussed.

Résumé

Résumé

Une méthode d'estimation de l'énergie libre de Gibbs et de la stabilité des minéraux argileux est proposée en vue de son utilisation dans les programmes d'ordinateurs déterminant l'évolution chimique des systèmes eau-roches naturels. On présente d'abord un modèle pour des solutions solides idéales d'un grand nombre de constituants puis on propose un ensemble de produits de solubilité estimés pour 36 constituants. Finalement on discute de l'application de la méthode à la prévision des stabilités des argiles dans la nature ou dans les conditions expérimentales.

Kurzreferat

Kurzreferat

Zur Abschätzung von freien Gibbs Energien und Stabilitäten von Tonmineralen mit Computerprogrammen wird eine Methode zur Berechnung der chemischen Entwicklung natürlicher Wasser-Gesteins Systeme vorgestellt. Diese basiert auf: (a) einem Modell von idealen Mischkristallen aus einer großen Anzahl Endgliedzusammensetzungen und (b) einem Datensatz geschätzter Löslichkeitsprodukte von 36 Endgliedern. Es wird die Brauchbarkeit der Methode zur Vorhersage experimenteller oder natürlicher Tonstabilitäten erörtert.

Resumen

Resumen

Se propone un método para la estimación de las energías libres de Gibbs y de la estabilidad de los minerales de la arcilla para uso con programas de ordenador con el propósito de determinar la evolución química de los sistemas naturales rocagua. Está basado en (i) un modelo para soluciones sóidas ideales de un gran número de composiciones del miembro final de la serie y (ii) los productos de solubilidad de 36 miembros final de serie. Se discute la aplicación del método para la predicción de la estabilidad de arcillas naturales o sintéticas.

Type
Research Article
Information
Clay Minerals , Volume 16 , Issue 4 , December 1981 , pp. 361 - 373
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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