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Cation site distribution in clinochlores: a NIR approach

Published online by Cambridge University Press:  09 July 2018

E. Ferrage*
Affiliation:
LGIT, EquipeGéochimie de l'Environnement, Maison des Géosciences, BP 53, 38041GrenobleCedex 9
F. Martin
Affiliation:
Université de Limoges, CNRS UMR 6532 ‘ Hydr'A.S.A.’, 123 Avenue Albert Thomas, 87060 Limoges Cedex
P. Micoud
Affiliation:
Equipe Géomarg, UMR 5563 du CNRS, LMTG, 39, allées Jules Guesde, Université Paul Sabatier, 31000 Toulouse
S. Petit
Affiliation:
Université de Poitiers, CNRS UMR 6532 ‘ Hydr'A.S.A.’, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex
P. De parseval
Affiliation:
Equipe Géomarg, UMR 5563 du CNRS, LMTG, 39, allées Jules Guesde, Université Paul Sabatier, 31000 Toulouse
D. Beziat
Affiliation:
Equipe Géomarg, UMR 5563 du CNRS, LMTG, 39, allées Jules Guesde, Université Paul Sabatier, 31000 Toulouse
J . Ferret
Affiliation:
Talc de Luzenac S.A., BP 1162, 31036 Toulouse Cedex, France
*
*E-mail: eric.ferrage@obs.ujf-grenoble.fr

Abstract

A near infrared (NIR) spectroscopy approach was undertaken to collect information on the Al cationic distribution in tetrahedral and octahedral sites in natural chlorite (clinochlore) samples. Structural formulae were established using electron microprobe and Mössbauer spectroscopy. A band located near 7115 cm–1 was attributed to the overtone of OH fundamental stretching mode of Mg2AlOH and increases with the total Al amount. Good correlation was obtained between the (SiAl)O–OH vibration band area and tetrahedral Al content, making it easy to partition Al (and thus Fe3+) between octahedral and tetrahedral sites.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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