An ideal solid solution model for calculating solubility of clay minerals

Tardy, Yves; Fritz, Bertrand

doi:10.1180/claymin.1981.016.4.05

Cited by 102 publications

(61 citation statements)

References 21 publications

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“…Also, they constitute a system for which no change in octahedral composition is required to change a montmorillonite into an illite. Tardy and Fritz (1981). The bulk compositions of the mixed-layer montmorillonite/illites are described by Hower and Mowatt in terms of the components, KA13Si301o(OH)2, KAIMgSi4Olo(OH)2, and A12Si40~0(OH)2.…”

Section: Some Compositional Relations Of Real Mixed-layer Montmorillomentioning

confidence: 99%

Montmorillonite/Illite Stability Diagrams

Garrels

1984

Clays and clay miner.

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Abstract-Chemical activity diagraoas , prepared to illustrate the properties expected if mixed-layer montmorillonite/illite is regarded as a solid solution, are compared to those derived from a treatment of these materials as a mixture of two phases. If the system is a solid solution, the coexisting aqueous solution should range from higher dissolved silica contents in the presence of kaolinite and a montmorillonite end member to lower dissolved silica in the presence of kaolinite and an illitic end member. Silica concentration in the aqueous solution might vary by a factor of as much as six. If the system is two phase, the silica content of a solution in equilibrium with kaolinite and both phases would be fixed at a given T and P, as would a solution equilibrated with both phases and K-feldspar. In the absence of a third phase, silica in equilibrium with both phases should be nearly constant, but increase with increasing ratio of K+/H + in solution. Available data on coexisting aqueous solutions apparently are more nearly consistent with two phases than with a solid solution.

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Section: Some Compositional Relations Of Real Mixed-layer Montmorillomentioning

confidence: 99%

Montmorillonite/Illite Stability Diagrams

Garrels

1984

Clays and clay miner.

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“…The existence of a solid solution between the two species has also been reported (23), with maximum substitution amounting to nearly 50%: 3CaO·Al 2 O 3 ·0.5CaCl 2 ·0.5CaSO 4 ·nH 2 O.…”

Section: Resultsmentioning

confidence: 69%

Durabilidad de pastas de cemento API clase B expuestas a disoluciones acuosas de iones cloruro, sulfato y magnesio

et al. 2008

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“…Several solid solution models have been put forward for the clay minerals, from the simple ideal mixing on homologicai sites (Tardy and Fritz, 1981;Aagaard and Helgeson, 1983;Helgeson and Aagaard, 1985;Walshe, 1986) to more "non ideal" models (Stoessel, 1979(Stoessel, , 1981(Stoessel, , 1984. The actual solid solution behavior of illites and chlorites is far from known in any detail, and by realizing the uncertainties in the thermodynamic data of several of the end member components, as well, we feel that any advanced solution model is not warranted at our present stage of knowledge.…”

Section: End Member Activities and Reaction Quotientmentioning

confidence: 98%

Diagenetic Illite-Chlorite Assemblages in Arenites. II. Thermodynamic Relations

Aagaard

Jahren

1992

Clays and clay miner.

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Abstract--The internal equilibrium status among chlorite-itlite pairs has been evaluated through coupled substitution reactions. Compositional data of chlorites and illites from arenites at present burial temperatures between 90 ~ and 180~ have been used to calculate end member activities and reaction quotients of the combined Tschermak reaction:Muscovite + Clinochlore = MgAl-celadonite + Amesite.The reaction quotient data in the 90 ~ to 180~ temperature range have then been compared with the equilibrium curve for the same reaction, and found to be in reasonable agreement. This indicates that chlorites and illites in these arenites grow at near equilibrium conditions.The data set has also been compared with chlorite-illite pairs from hydrothermally altered arenites of the Salton Sea area. For chlorite-iUite containing assemblages, these data agree well with the diagenetic ones. The introduction of biotite at higher temperatures alters with the iron-magnesium distribution and breaks down the substitution relationship between chlorite and illite.The model predicts an increasing stability of muscovite and clinochlore components with increasing temperature, while celadonite and amesite would be stabilized with increasing pressure. This is consistent with high pressure occurrences of phengite. However, at the low pressure region of diagenesis and hydrothermal alteration, the temperature effect is dominant.

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An ideal solid solution model for calculating solubility of clay minerals

Cited by 102 publications

References 21 publications

Montmorillonite/Illite Stability Diagrams

Montmorillonite/Illite Stability Diagrams

Durabilidad de pastas de cemento API clase B expuestas a disoluciones acuosas de iones cloruro, sulfato y magnesio

Diagenetic Illite-Chlorite Assemblages in Arenites. II. Thermodynamic Relations

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