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Hydrothermal reactivity of K-smectite at 300°C and 100 bar: dissolution-crystallization process and non-expandable dehydrated smectite formation

Published online by Cambridge University Press:  09 July 2018

R. Mosser-Ruck ,
M. Cathelineau ,
A. Baronnet  and
A. Trouiller
R. Mosser-Ruck
Affiliation:
Université Henri Poincaré-UMR 7566, BP239, 54 Vandoeuvre-lès-Nancy Cedex
M. Cathelineau
Affiliation:
Université Henri Poincaré-UMR 7566, BP239, 54 Vandoeuvre-lès-Nancy Cedex
A. Baronnet
Affiliation:
CNRS-CRMC2, Campus Luminy, Case 913, 13298 Marseille, Cedex
A. Trouiller
Affiliation:
ANDRA, Parc de la Croix Blanche, 1-7 rue Jean Monnet, 92298 Chatenay-Malabry Cedex, France
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Abstract

The hydrothermal reactivity of a smectite saturated with K was studied experimentally at 300°C and 100 bar in (Na,K) chloride solutions (Na/K = 0, 50 and 100, liquid/solid ratio = 10/1). X-ray diffraction, TEM and microprobe results show: (1) a partial to total dissolution of the initial smectite layers; and (2) the crystallization of newly-formed euhedral I-S. Random I-S is formed after 7 days, but an ordered mixed-layer I-S containing <30% expandable layers formed in the longest runs (112 days). The I-S is characterized by non-expandable layers of two distinct types: dehydrated smectite and illite. The Si content is lower in the I-S than in the initial smectite, thus creating a charge deficit, mostly compensated by the introduction of Na to the interlayer space, and yielding a silica release to the solution and subsequent crystallization of quartz and cristobalite.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 2 , June 1999 , pp. 275 - 290
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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