Illite equilibria in solutions: II. Phase relationships in the system K 2 O---MgO---Al 2 O 3 ---SiO 2 ---H 2 O

Details Illite equilibria in solutions: II. Phase relationships in the system K 2 O---MgO---Al 2 O 3 ---SiO 2 ---H 2 O Illite equilibria in solutions: II. Phase relationships in the system K 2 O---MgO---Al 2 O 3 ---SiO 2 ---H 2 O

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.1365a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 5, pp.1365-1374

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The stability of the Marblehead illite has been investigated in the five-component system K 2 O-MgO-Al 2 O 3 -SiO 2 -H 2 O in the presence of kaolinite and microcline. The mica-like solubility-controlling phases [K x (Mg y Al 2-y )(Al x-y Si 4-(x-y) ) O 10 (OH) 2 ]identified include (i) smectite X = 0.29 ± 0.04, Y = 0.26 ± 0.02; (ii) illite X = 0.50 ± 0.05, Y = 0.22 ± 0.14; (iii) illite X = 0.69 ± 0.08, Y = 0.16 ± 0.03; (iv) illite X = 0.85 ± 0.05, Y = 0.12 ± 0.04; and (v) muscovite. Possible stability regions have been defined for these solubility-controlling phases using isothermal isobaric log a Mg 1/2 +2/2a H + vs. log a H + diagrams. When illite stability is referred to the quaternary system K 2 O-Al 2 O 3 -SiO 2 -H 2 O, the effect of (R +2 ) VI substitution is neglected. The error inherent in this simplification has been estimated. Inasmuch as a four-fold increase in a Mg 2+ shifts the illite-smectite-kaolinite-solution invariant point by less than 0.3 log units, stability relationships in the quaternary system provide an adequate representation of illite solution equilibria, to a first approximation. However, the error caused by neglecting Mg +2 is close to or within experimental error. Thus, a more precise determination of the effect of Mg +2 on illite solution equilibria may not be possible using the solution equilibration method.

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