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The accurate crystal chemistry of ferric smectites from the lateritic nickel ore of Murrin Murrin (Western Australia). II. Spectroscopic (IR and EXAFS) approaches

Published online by Cambridge University Press:  09 July 2018

A. Gaudin ,
S. Petit ,
J. Rose ,
F. Martin ,
A. Decarreau ,
Y. Noack  and
D. Borschneck
A. Gaudin*
Affiliation:
UMR CNRS 6112, Laboratoire de Planétologie et Géodynamique, Faculté des Sciences et Techniques, Université de Nantes, BP-92208, 44322, Nantes Cedex 03 CEREGE, UMR CNRS 6635 Université Aix-Marseille III, Europôle Méditerranéen de l'Arbois, BP 80 F-13545 Aix-en-Provence Cedex 04
S. Petit
Affiliation:
UMR CNRS 6532, HydrASA, Université de Poitiers, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex
J. Rose
Affiliation:
CEREGE, UMR CNRS 6635 Université Aix-Marseille III, Europôle Méditerranéen de l'Arbois, BP 80 F-13545 Aix-en-Provence Cedex 04
F. Martin
Affiliation:
L.A.S.E.H., Faculté des Sciences et Techniques, Université de Limoges, 87060 Limoges Cedex, France
A. Decarreau
Affiliation:
UMR CNRS 6532, HydrASA, Université de Poitiers, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex
Y. Noack
Affiliation:
CEREGE, UMR CNRS 6635 Université Aix-Marseille III, Europôle Méditerranéen de l'Arbois, BP 80 F-13545 Aix-en-Provence Cedex 04
D. Borschneck
Affiliation:
CEREGE, UMR CNRS 6635 Université Aix-Marseille III, Europôle Méditerranéen de l'Arbois, BP 80 F-13545 Aix-en-Provence Cedex 04
*
*E-mail: [email protected]
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Abstract

Fe-rich smectites from lateritic weathering profiles have previously been studied by XRD, ICP-AES, SEM-EDX and TEM-EDX analyses (Gaudin et al., 2004). These smectites exhibit intermediate chemistries between five end-members: Al-Fe beidellites, Al-Fe montmorillonites and Mg+Ni-saponite. The spectroscopic study by FTIR and XAS of these smectites reveals that: (1) tetrahedral Fe3+ is near or below the detection limit (0.05 cation for 4Si); (2) the large chemical variability is due to substitution of the three major cations (Fe, Al, Mg) within adjacent octahedra; (3) Ni is not concentrated in another clay phase such as Ni-kerolite and is located in the octahedral sheets of smectite; (4) octahedral cations are not randomly distributed but ordered in separated Fe, Al, Mg, Ni clusters; (5) the Mg-Ni saponite end-member actually appears as small trioctahedral clusters of Mg and Ni distributed within the dioctahedral smectite.

Keywords

smectitesinfrared spectroscopyNilateriteMurrin MurrinAustralia
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 4 , December 2004 , pp. 453 - 467
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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