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Polygenic chamosite from a hydrothermalized oolitic ironstone (Saint-Aubin-des-Châteaux, Armorican Massif, France): crystal chemistry, visible–near-infrared spectroscopy (red variety) and geochemical significance

Published online by Cambridge University Press:  13 May 2020

Yves Moëlo Open the ORCID record for Yves Moëlo [Opens in a new window] ,
Emmanuel Fritsch ,
Eric Gloaguen  and
Olivier Rouer
Yves Moëlo*
Affiliation:
Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000Nantes, France
Emmanuel Fritsch
Affiliation:
Université de Nantes, CNRS, Institut des Matériaux Jean Rouxel, IMN, F-44000Nantes, France
Eric Gloaguen
Affiliation:
BRGM, 3, avenue Claude Guillemin, BP 36009, 45060Orléans cedex 2, France ISTO, UMR 7327, Université d'Orléans, CNRS, BRGM, F-45071Orléans, France
Olivier Rouer
Affiliation:
Laboratoire Georessources, UMR 7359, FST-SCMEM, Université de Lorraine, BP 70239-54506Vandœuvre les Nancy Cedex, France
*
*E-mail: Yves.Moelo@cnrs-imn.fr
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Abstract

Several generations of chamosite, including a red variety, occur in the Ordovician hydrothermalized oolitic ironstone from Saint-Aubin-des-Châteaux (Armorican Massif, France). Their chemical re-examination indicates a low Mg content (0.925 < Fe/(Fe + Mg) < 0.954), but a significant variation in IVAl. Minor vanadium is present at up to 1.1 wt.% oxide. Variations in IVAl, the vanadium content and the colour of chamosite are related to the hydrothermal reworking of the ironstone. Taking into account other published data, the ideal composition of chamosite is (Fe5–xAl1+x)(Si3–xAl1+x)O10(OH)8, with 0.2 < x < 0.8 (0.2: equilibrium with quartz; 0.8: SiO2 deficit). The red chamosite (IIb polytype) has a mean composition of (Fe3.87Mg0.23Mn0.01□0.07Al1.74V0.07)(Si2.33Al1.67)O10(OH)8. This chamosite is strongly pleochroic, from pale yellow (E || (001)) to deep orange red (E ⊥ (001)). Visible–near-infrared absorbance spectra show a specific absorption band centred at ~550 nm for E ⊥ (001), due to a proposed new variety of Fe/V intervalence charge-transfer mechanism in the octahedral sheet, possibly Fe2+ – V4+ → Fe3+ – V3+. While the formation of green chamosite varieties is controlled by reducing conditions due to the presence of organic matter as a buffer, that of red chamosite would indicate locally a weak increase of fO2 related to oxidizing hydrothermal solutions.

Keywords

Armorican MassifFrancechamositecrystal chemistryvanadiumvisible-NIR spectroscopy
Type
Article
Information
Clay Minerals , Volume 55 , Issue 1 , March 2020 , pp. 83 - 95
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland, 2020

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Footnotes

Associate Editor: J. Cuadros

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