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Thermally induced mineral and chemical transformations in calcareous mudstones around a basaltic dyke (Perthus Pass, southern Massif Central, France). Possible implications as a natural analogue of nuclear waste disposal

Published online by Cambridge University Press:  09 July 2018

C. Henry ,
J.-Y. Boisson ,
A. Bouchet  and
A. Meunier
C. Henry*
Affiliation:
Laboratoire Hydr ASA, CNRS-UMR 6532, Université de Poitiers, 40 Av. du Recteur Pineau, 86022 Poitiers Cedex, France
J.-Y. Boisson
Affiliation:
Institut de Radioprotection et de Sûreté Nucléaire, BP 6, 92265 Fontenay-aux-Roses Cedex, France
A. Bouchet
Affiliation:
Etudes Recherches Matériaux, Espace 10, République 2, Rue Albin Haller, 86000 Poitiers, France
A. Meunier
Affiliation:
Laboratoire Hydr ASA, CNRS-UMR 6532, Université de Poitiers, 40 Av. du Recteur Pineau, 86022 Poitiers Cedex, France
*
*E-mail: caroline.bouchet.henry@univ-poitiers.fr
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Abstract

A mixed-layer illite-smectite, illite-rich calcareous mudstone intruded by a basaltic dyke at the Perthus Pass (southern Massif Central, France) allows us to study the transformation of clays subjected to a brief thermal gradient. X-ray diffraction, scanning electron microscopy, electron microprobe and atomic absorption spectroscopy analyses were performed on samples at variable distances from the mudstone-dyke contacts.

A roughly similar evolution is seen on both sides of the dyke: quartz, calcite, kaolinite and illite disappear; Ca-silicates, albite and saponite-beidellite form, late meteoric halloysite crystallizes in open fractures.

Chemical and mineralogical transformations are related to heat diffusion from the dyke. Theoretical calculations highlight the influence of the dyke orientation. The mineralogical reactions observed in rocks are similar to those observed in experimental conditions. The formation of new swelling phases with a high retention capacity linked to a short duration, large-temperature increase, should constitute a positive process for Repository Performance Assessment.

Keywords

basaltillite-rich calcareous mudstonecontact metamorphismCa-silicatessaponite-beidelliteMassif CentralPerthus PassFrance
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 2 , June 2007 , pp. 213 - 231
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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