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High-charge to low-charge smectite reaction in hydrothermal alteration processes

Published online by Cambridge University Press:  09 July 2018

A. Bouchet ,
D. Proust ,
A. Meunier  and
D. Beaufort
A. Bouchet
Affiliation:
Laboratoire de Pétrologie des Altérations Hydrothermales, Université de Poitiers, 40 Avenue Recteur Pineau, 86022 Poitiers Cedex, France
D. Proust
Affiliation:
Laboratoire de Pétrologie des Altérations Hydrothermales, Université de Poitiers, 40 Avenue Recteur Pineau, 86022 Poitiers Cedex, France
A. Meunier
Affiliation:
Laboratoire de Pétrologie des Altérations Hydrothermales, Université de Poitiers, 40 Avenue Recteur Pineau, 86022 Poitiers Cedex, France
D. Beaufort
Affiliation:
Laboratoire de Pétrologie des Altérations Hydrothermales, Université de Poitiers, 40 Avenue Recteur Pineau, 86022 Poitiers Cedex, France
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Abstract

Illite/smectite mixed-layered minerals (I/S) occurring in hydrothermally altered dacite from the island of Martinique were studied using X-ray powder diffraction, electron microprobe and CEC measurement techniques. Microprobe analyses and X-ray identification of high- and low-charge smectite layers indicate that the I/S hydrothermal alteration operates from wall-rock to hydrothermal veins, with conversion of high-charge to low-charge smectite and formation of illite layers. The overall alteration reaction can be expressed as: mixed-layered high-charge smectite + Si4+ + K+ → mixed-layered low-charge smectite + illite. This reaction requires Si and K from external sources and differs from the currently invoked mechanisms for diagenetic illitization where Si is released. The proposed reaction appears, therefore, to be the first step of I/S alteration under low-temperature hydrothermal conditions, prior to the crystallization of newly-formed I/S.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 2 , June 1988 , pp. 133 - 146
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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