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Activity/Composition Relations among Silicates and Aqueous Solutions: II. Chemical and Thermodynamic Consequences of Ideal Mixing of Atoms on Homological Sites in Montmorillonites, Illites, and Mixed-Layer Clays

Published online by Cambridge University Press:  02 April 2024

Per Aagaard  and
Harold C. Helgeson
Per Aagaard*
Affiliation:
Department of Geology and Geophysics, University of California, Berkeley, California 94720
Harold C. Helgeson
Affiliation:
Department of Geology and Geophysics, University of California, Berkeley, California 94720
*
1Present address: Institute of Geology, University of Oslo, Oslo 3, Norway.
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Abstract

The activities of thermodynamic components of clay minerals corresponding in composition to pyrophyllite, muscovite, paragonite, and margarite were computed from chemical analyses reported in the literature assuming ideal mixing of atoms on homological sites in the minerals. These activities were then used to generate stability fields for smectites, illites, and mixed-layer clays on logarithmic activity diagrams representing equilibrium among minerals and aqueous solutions at 25°C and 1 bar. Comparative analysis indicates that the approach affords close approximation of both mineral and water compositions in geologic systems.

Резюме

Резюме

Рассаитывались активности термодинамических компонентов глинистых минералов, соответствующих по составу пирофиллиту, мусковиту, парагониту и Маргариту. Расчет был проведен на основании опубликованных данных химических анализов, предполагая идеальную смесь атомов в гомологических местах минералов. Полученные величины активностей использовались для определения полей стабильности смектитов, иллитов, и переслаивающихся глин на логаритмических диаграммах активностей, представляющих равновесие между минералами и водным раствором при температуре 25°С и давлении 1 бар. Сравнительный анализ указывает на то, что этот подход хорошо описывает состав минералов и воды в геологических системах. [E.G.]

Resümee

Resümee

Die Aktivitäten der thermodynamischen Komponenten von Tonmineralen, die in ihrer Zusammensetzung Pyrophyllit, Muskovit, Paragonit, und Margarit entsprechen, wurden aus chemischen Analysen, die in der Literatur angegeben sind, mittels Computer berechnet, wobei eine ideale Mischung von Atomen auf homologen Plätzen in den Mineralen angenommen wird. Diese Aktivitäten wurden dann verwendet, um die Stabilitätsbereiche von Smektiten, Illiten und Wechsellagerungstonen in logarithmischen Diagrammen aufzustellen, die Gleichgewicht zwischen den Mineralen und den wässrigen Lösungen bei 25°C und 1 Bar darstellen. Vergleichende Analysen deuten darauf hin, daß dieses Vorgehen zu einer guten Annäherung an die Mineral- und Wasserzusammensetzung in geologischen Systemen führt. [U.W.]

Résumé

Résumé

Les activités des composés thermodynamiques de minéraux argileux correspondant en composition à la pyrophyllite, muscovite, paragonite, et margarite ont été computés à partir d'analyses chimiques rapportées dans la littérature, supposant un mélange idéal d'atomes sur des sites homologues dans les minéraux. Ces activités ont alors été utilisées pour générer des champs d’équilibre pour des smectites, illites et argiles à couches mélangées sur des diagrammes d'activité logarithmique représentant l’équilibre entre les minéraux et des solutions aqueuses à 25°C et 1 bar. L'analyse comparative indique que cette approche permet une approximation proche des compositions minérales et aqueuses dans des systèmes géologiques. [D.J.]

Keywords

ActivityAtom mixingIlliteMixed layersMontmorilloniteThermodynamics
Type
Research Article
Information
Clays and Clay Minerals , Volume 31 , Issue 3 , June 1983 , pp. 207 - 217
Copyright
Copyright © 1983, The Clay Minerals Society

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