Computer Science
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3431a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 11, pp.3431-3435
Computer Science
1
Scientific paper
In a recent solubility study of Goose Lake and Beavers Bend illite, Sass et al. (1987) inferred the existence of three components of natural illites [ K 0.24 / O 10 ( OH ) 2 ], [ K 0.67 / O 10 ( OH ) 2 ], and [ K 0.90 / O 10 ( OH ) 2 ] which were interpreted to be smectite, illite, and K-mica, respectively. They also speculated that illite-smectite equilibrium is metastable under diagenetic conditions except between 90 and 110°C where it is stabilized by an ordering transition. A re-interpretation of the data of et al. (1987) indicates that the solubility-controlling phases have the following K atoms per half cell: 0.29, 0.52, 0.69, 0.84, and 1.0. Furthermore, solution equilibration investigations of kaolinite-microcline mixtures have shown that these two minerals do not coexist stably. Thus, the question of an ordering transition whose main effect is to stabilize illite-smectite equilibria relative to kaolinite-microcline assemblage does not arise.
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