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Jarosite formation in weathered siliceous chalk in Fontevrault abbey, Loire Valley, France

Published online by Cambridge University Press:  05 July 2018

Andreas Bauer  and
Bruce Velde
Andreas Bauer
Affiliation:
Ecole Normale Supérieure, Departement de Géologie, 24, rue Lhomond, F-75231 Paris Cedex 05, France BRGM, Département Géomatériaux et Géoprocédés, Avenue de Concyr, B.P. 6009, F-45060 Orléans Cedex 2, France
Bruce Velde
Affiliation:
Ecole Normale Supérieure, Departement de Géologie, 24, rue Lhomond, F-75231 Paris Cedex 05, France
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Abstract

Jarosite, a hydrous potassium iron sulphate mineral, has been found as the product of weathering in a silicic chalk building stone of a 13th century abbey at Fontevrault (Maine-et-Loire, France). Destabilization of pyrite and glauconite dispersed in the calcareous stone results in the formation of jarosite. The alteration process is probably of very local origin, within the zone in the building stone at its surface where oxidation occurs during wetting and drying on a cyclical basis. The problem of the incompatibility of highly acidic solutions needed to stabilise jarosite (2.5 < pH) within the highly porous, calcareous silicate rock is not explained at present.

Keywords

Jarositesilicic chalkweathering

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 61 , Issue 408 , October 1997 , pp. 705 - 711
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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