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Sudoite in some Visean (Lower Carboniferous) K-bentonites from Belgium

Published online by Cambridge University Press:  09 July 2018

A. Anceau
A. Anceau*
Affiliation:
Laboratoire de Géologie des Argiles, Université de Liège, Allée du 6 Août B 18, B-4000 Liège, Belgique
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Abstract

Sudoite occurs as a cryptocrystalline clay in some Visean K-bentonites from Belgium. Usually associated with illite-smectite mixed-layers, this chlorite has been found locally as a monomineralic clay component of a K-bentonite bed. The mineral has a composition close to (Al3Mg2)(Si3Al)O10(OH)8. The cell parameters have been calculated from the diffractogram using the space group C2/m (a = 5·228, b = 9·056, c = 14·326 Å, β = 97°00′, d(060) = 1·509 Å). The polytype corresponds to a IIb structure. Some hypotheses are proposed for the origin of this chlorite. The coexistence of sudoite and pyrite could explain why the chlorite present in Visean K-bentonites is not a Fe-rich species typical of diagenetic conditions, but a Fe-poor one.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 3 , September 1992 , pp. 283 - 292
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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