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An experimental alteration of montmorillonite to a di + trioctahedral smectite assemblage at 100 and 200°C

Published online by Cambridge University Press:  09 July 2018

D. Beaufort ,
G. Berger ,
J. C. Lacharpagne  and
A. Meunier
D. Beaufort*
Affiliation:
UMR 6532 CNRS HydrASA, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex
G. Berger
Affiliation:
LMTG - UMR 5563 CNRS, Université Paul Sabatier, 38 rue des 36 Ponts, 31400 Toulouse Cedex
J. C. Lacharpagne
Affiliation:
Elf EP, DTIS/SED, 64018 Pau Cedex, France
A. Meunier
Affiliation:
UMR 6532 CNRS HydrASA, Université de Poitiers, 40 Avenue du Recteur Pineau, 86022 Poitiers Cedex
*
*E-mail: [email protected] -poitiers.fr
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Abstract

Hydrothermal experiments were performed at 100 and 200°C and at different clay:water ratios in order to investigate the transformation of smectitic layers during the alteration of a montmorillonitic starting material. This study focused on three phenomena: (1) the amount and localization of charge within the layer of the newly-formed dioctahedral smectite; (2) the stacking of low- and high-charge layers in the dioctahedral smectitic material; and (3) the neoformation of trioctahedral smectites.

In all of the runs, the formation of beidellite from montmorillonite induced morphological changes in clay particles which suggests a reaction proceeding by a dissolution-crystallization mechanism. Illite layers were detected in K-saturated montmorillonite runs after the transformation of ∼50% of the starting montmorillonite into beidellite (i.e. after 5 months of reaction with distilled water at 200°C). These illite layers were interstratified with both high-charge and low-charge dioctahedral smectites in a hypothetical three-component mixed-layer mineral.

Keywords

montmorillonitebeidelliteillite-smectiteexperimental illitization
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 2 , June 2001 , pp. 211 - 225
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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