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Chemistry of Illite/Smectite and End-Member Illite

Published online by Cambridge University Press:  02 April 2024

Jan Środoń ,
David J. Morgan ,
Eric V. Eslinger ,
Dennis D. Eberl  and
Michael R. Karlinger
Jan Środoń
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, 31-002 Krakow, Senacka 3, Poland
David J. Morgan
Affiliation:
British Geological Survey, 64 Gray's Inn Road, London WC1X 8NG, United Kingdom
Eric V. Eslinger
Affiliation:
Cities Service Oil and Gas Corporation, P.O. Box 3908, Tulsa, Oklahoma 74102
Dennis D. Eberl
Affiliation:
U.S. Geological Survey, MS 404, Federal Center, Denver, Colorado 80225
Michael R. Karlinger
Affiliation:
U.S. Geological Survey, MS 404, Federal Center, Denver, Colorado 80225
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Abstract

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Chemical data from three different series of diagenetic illite/smectites (I/S), analyzed statistically by two regresion techniques, indicate that the content of fixed-K per illite layer is not constant, but ranges from ~0.55 per O10(OH)2 for illite layers in randomly interstratified I/S (R=0; >50% smectite layers) to ~ 1.0 per O10(OH)2 for illite layers formed in ordered I/S (R>0; <50% smectite layers). By extrapolation of the experimental data, the following chemical characteristics were obtained for end-member illite derived from the alteration of smectite in bentonite: average fixed-K per illite layer = 0.75 per O10(OH)2; total charge = about -0.8; cation-exchange capacity = 15 meq/100 g; surface area (EGME) = 150 m2/g.

Keywords

BentoniteChemical compositionDiagenesisIlliteIllite/smectiteSmectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 4 , August 1986 , pp. 368 - 378
Copyright
Copyright © 1986, The Clay Minerals Society

Footnotes

1

Visiting exchange scientist at the Water Resources Division, U.S. Geological Survey, Denver, Colorado.

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