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Smectite to Illite Conversion in Bentonites and Shales of the East Slovak Basin

Published online by Cambridge University Press:  09 July 2018

V. Šucha ,
I. Kraust ,
H. Gerthofferová ,
J. Peteš  and
M. Sereková
V. Šucha
Affiliation:
Geological Institute Slovak Academy of Sciences, Dúbravská cesta 9, 842 26 Bratislava
I. Kraust
Affiliation:
Faculty of Natural Sciences, Comenius University, Mlynská dolina D, Bratislava, Slovakia
H. Gerthofferová
Affiliation:
Faculty of Natural Sciences, Comenius University, Mlynská dolina D, Bratislava, Slovakia
J. Peteš
Affiliation:
Faculty of Natural Sciences, Comenius University, Mlynská dolina D, Bratislava, Slovakia
M. Sereková
Affiliation:
Faculty of Natural Sciences, Comenius University, Mlynská dolina D, Bratislava, Slovakia
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Abstract

The conversion of smectite to illite has been studied in buried bentonites and shales of the East Slovak Neogene Basin, using X-ray diffraction analysis and transmission electron microscopy. A good correlation was observed in both rock types between the content of expandable layers in interstratified illite-smectite (I-S) minerals and burial depth (temperature), with shales from a given depth being markedly more illitic than bentonties. This difference disappeared at a depth of ~3 km, which represents a temperature of ~150°C The diameter of fundamental illite particles increased with decreasing expandability. Potassium fixation together with neoformation appear to be the mechanisms of conversion of smectite to illite.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 2 , June 1993 , pp. 243 - 253
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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