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- W2048822944 abstract "Natural illite from Marblehead, Wisconsin (MH), USA, has been equilibrated with 0.2 and 2.0M KCl/KOH and KCl/HCl solutions in the presence of excess kaolinite or microcline and quartz or amorphous silica at temperatures between 25 and 250°C and Pv = PH2O- Reversibility of univariant equilibria was demonstrated by approach from high and low aK+aH+ and from silica under- and super-saturation. Solutions were separated after experiments using immiscible displacement techniques. Isothermal, isobaric log ak+/aH+ vs. log aSiO2,aq diagrams have been constructed denning possible stability fields for kaolinite, microcline, gibbsite (or boehmite or diaspore), muscovite, and four illitic phases. Assuming an R+2-free stoichiometry, K-content per half cell, estimated from the slopes of univariant lines, are 0.29, 0.50, 0.69, and 0.85 K; these phases are compositional analogs of smectite (S), mixed-layer illite I/S (i.e., IS, ISII) and illite (I), respectively. Illitization reactions are strongly affected by temperature and porewater chemistry. At quartz saturation, direct conversion of smectite or kaolinite to endmember illite can occur at high pH; at low pH, these reactions are unlikely inasmuch as K+ requirements exceed concentrations observed in most natural pore waters. In silica-supersaturated solutions, illitization reactions proceed through crystallization of intermediate phases with compositions between smectite and endmember illite (I)." @default.
- W2048822944 created "2016-06-24" @default.
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- W2048822944 date "1991-05-01" @default.
- W2048822944 modified "2023-09-23" @default.
- W2048822944 title "Illite equilibria in solutions: I. Phase relationships in the system K2OAl2O3SiO2H2O between 25 and 250°C" @default.
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- W2048822944 doi "https://doi.org/10.1016/0016-7037(91)90313-t" @default.
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