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Title: Stability of illite/smectite during diagenesis: an experimental study

Abstract

Illites from Goose Lake (Illinois) and Beavers Bend (Oklahoma) were equilibrated in 0.2 M and 2.0 M KCl solutions with excess kaolinite and either gibbsite, boehmite, quartz, or amorphous silica. Teflon-lined reaction vessels were used to heat the charges from 25/sup 0/ to 250/sup 0/C at the vapor pressures of solution. Partial reversibility was demonstrated by approaching equilibria from both high and low K/sup +/H/sup +/ activity ratios. The experimental data were used to construct isothermal, isobaric activity diagrams (log (a/sub K/sup +//a/sub H/sup +//) vs. log a/sub SiO/sub 2//) for the system K/sub 2/O-Al/sub 2/O/sub 3/-SiO/sub 2/-H/sub 2/O. Stability regions have been defined for kaolinite, boehmite, and three other phases that are believed to be components of both illites. At low temperatures (<90/sup 0/C) illite-smectite equilibrium is metastable with respect to calculated kaolinite-microcline equilibrium. Between 90/sup 0/C and 110/sup 0/C a phase transition involving illite and smectite occurs which stabilizes the assemblages illite-smectite-kaolinite and illite-smectite-microcline. This transition occurs at the same temperature as the ordering transition in natural IS. Above 110/sup 0/C the assemblage illite-smectite is again metastable with respect to kaolinite-microcline, but at 200/sup 0/C and above illite and smectite may coexist stably with either kaolinite or microcline.more » However, smectite decomposes where a/sub SiO/sub 2//sup 0// is controlled to quartz solubility yielding the stable assemblage illite-kaolinite-quartz and illite-mica-quartz.« less

Authors:
; ;
Publication Date:
Research Org.:
Battelle, Pacific Northwest Labs., Richland, WA (USA)
OSTI Identifier:
5062906
Resource Type:
Journal Article
Journal Name:
Geochim. Cosmochim. Acta; (United States)
Additional Journal Information:
Journal Volume: 51:8
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ILLITE; CHEMICAL REACTION KINETICS; DIAGENESIS; STRUCTURAL CHEMICAL ANALYSIS; THERMODYNAMIC ACTIVITY; SMECTITE; BENCH-SCALE EXPERIMENTS; EQUILIBRIUM; EXPERIMENTAL DATA; GEOCHEMISTRY; ILLINOIS; OKLAHOMA; POTASSIUM CHLORIDES; STABILITY; ALKALI METAL COMPOUNDS; ALUMINIUM COMPOUNDS; ALUMINIUM SILICATES; CHEMISTRY; CHLORIDES; CHLORINE COMPOUNDS; CLAYS; DATA; FEDERAL REGION V; FEDERAL REGION VI; HALIDES; HALOGEN COMPOUNDS; INFORMATION; KINETICS; MINERALS; NORTH AMERICA; NUMERICAL DATA; OXYGEN COMPOUNDS; POTASSIUM COMPOUNDS; REACTION KINETICS; SILICATE MINERALS; SILICATES; SILICON COMPOUNDS; USA; 580400* - Geochemistry- (-1989)

Citation Formats

Sass, B M, Rosenberg, P E, and Kittrick, J A. Stability of illite/smectite during diagenesis: an experimental study. United States: N. p., 1987. Web. doi:10.1016/0016-7037(87)90259-6.
Sass, B M, Rosenberg, P E, & Kittrick, J A. Stability of illite/smectite during diagenesis: an experimental study. United States. https://doi.org/10.1016/0016-7037(87)90259-6
Sass, B M, Rosenberg, P E, and Kittrick, J A. 1987. "Stability of illite/smectite during diagenesis: an experimental study". United States. https://doi.org/10.1016/0016-7037(87)90259-6.
@article{osti_5062906,
title = {Stability of illite/smectite during diagenesis: an experimental study},
author = {Sass, B M and Rosenberg, P E and Kittrick, J A},
abstractNote = {Illites from Goose Lake (Illinois) and Beavers Bend (Oklahoma) were equilibrated in 0.2 M and 2.0 M KCl solutions with excess kaolinite and either gibbsite, boehmite, quartz, or amorphous silica. Teflon-lined reaction vessels were used to heat the charges from 25/sup 0/ to 250/sup 0/C at the vapor pressures of solution. Partial reversibility was demonstrated by approaching equilibria from both high and low K/sup +/H/sup +/ activity ratios. The experimental data were used to construct isothermal, isobaric activity diagrams (log (a/sub K/sup +//a/sub H/sup +//) vs. log a/sub SiO/sub 2//) for the system K/sub 2/O-Al/sub 2/O/sub 3/-SiO/sub 2/-H/sub 2/O. Stability regions have been defined for kaolinite, boehmite, and three other phases that are believed to be components of both illites. At low temperatures (<90/sup 0/C) illite-smectite equilibrium is metastable with respect to calculated kaolinite-microcline equilibrium. Between 90/sup 0/C and 110/sup 0/C a phase transition involving illite and smectite occurs which stabilizes the assemblages illite-smectite-kaolinite and illite-smectite-microcline. This transition occurs at the same temperature as the ordering transition in natural IS. Above 110/sup 0/C the assemblage illite-smectite is again metastable with respect to kaolinite-microcline, but at 200/sup 0/C and above illite and smectite may coexist stably with either kaolinite or microcline. However, smectite decomposes where a/sub SiO/sub 2//sup 0// is controlled to quartz solubility yielding the stable assemblage illite-kaolinite-quartz and illite-mica-quartz.},
doi = {10.1016/0016-7037(87)90259-6},
url = {https://www.osti.gov/biblio/5062906}, journal = {Geochim. Cosmochim. Acta; (United States)},
number = ,
volume = 51:8,
place = {United States},
year = {Sat Aug 01 00:00:00 EDT 1987},
month = {Sat Aug 01 00:00:00 EDT 1987}
}