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Clay Minerals; September 2003; v. 38; no. 3; p. 329-338; DOI: 10.1180/0009855033830099
© 2003 Mineralogical Society of Great Britain and Ireland
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Review

Cation site distribution in clinochlores: a NIR approach

E. FERRAGE1,*, F. MARTIN2, P. MICOUD3, S. PETIT4, P. de PARSEVAL3, D. BEZIAT3 and J. FERRET5

1 LGIT, Equipe Géochimie de l’Environnement, Maison des Géosciences, BP 53, 38041 Grenoble Cedex 9, 2 Université de Limoges, CNRS UMR 6532 ‘Hydr’A.S.A.’, 123 Avenue Albert Thomas, 87060 Limoges Cedex, 3 Equipe Géomarg, UMR 5563 du CNRS, LMTG, 39, allées Jules Guesde, Université Paul Sabatier, 31000 Toulouse, 4 Université de Poitiers, CNRS UMR 6532 ‘Hydr’A.S.A.’, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, and 5 Talc de Luzenac S.A., BP 1162, 31036 Toulouse Cedex, France

* E-mail: eric.ferrage{at}obs.ujf-grenoble.fr

(Received 21 December 2001; revised 5 May 2003)

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.

KEYWORDS: Chlorite, NIR, crystal chemistry, Mössbauer spectroscopy




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[Abstract] [Full Text] [PDF]


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