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Etude de la repartition des cations interfoliaires dans les phlogopites alterees-(Na, Ca) et (Na, K)

Published online by Cambridge University Press:  09 July 2018

J.-P. Gaultier
J.-P. Gaultier*
Affiliation:
Station de Science du Sol, INRA, Route de St Cyr, 78000 Versailles, France
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Resume

Les propriétés d'hydratation de phlogopites altérées-(Na,Ca) et -(Na,K) sont étudiées á l'aide des techniques de diffraction des rayons X. La comparaison du diagramme calculé d'après un modèle mathématique au diagramme expérimental permet de mettre en évidence un phénomène de démixtion des cations dans les espaces interfoliaires. Cette ségrégation est plus importante dans le cas des échantillons -(Na,K) que dans celui des échantillons -(Na,Ca). Une analyse quantitative du phénomène montre l'existence d'une ou de deux phases cristallines distinctes selon les teneurs en calcium ou en potassium. Les proportions relatives de ces deux phases ainsi que la composition de leurs espaces interfoliaires ont été déterminées. Un mécanisme élémentaire est proposé; il explique la présence et la composition de ces différentes phases.

Abstract

Abstract

Hydration properties of bi-ionic, weathered (Na,Ca)- and (Na,K)-phlogopites have been studied by X-ray diffraction techniques. Comparison of the experimental patterns with those calculated from a mathematical model gave evidence of demixing of the cations in the interlamellar space. This segregation was more important for the (Na,K)- than for the (Na,Ca)-saturated samples. Quantitative analysis of the phenomenon demonstrated the existence of one or two distinct phases depending on the proportions of calcium or potassium present. The relative proportions of these two phases and the composition of their interlamellar spaces were determined. An elementary mechanism is proposed which explains the presence and composition of these different phases.

Type
Research Article
Information
Clay Minerals , Volume 20 , Issue 1 , March 1985 , pp. 1 - 14
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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