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The influence of octahedral and tetrahedral cation substitution on the structure of smectites and serpentines as observed through infrared spectroscopy

Published online by Cambridge University Press:  09 July 2018

J . Bishop ,
E. Murad  and
M. D. Dyar
J . Bishop*
Affiliation:
SETI Institute/NASA-Ames Research Center, Moffett Field, CA 94035, USA
E. Murad
Affiliation:
Bayerisches Geologisches Landesamt, Leopoldstrasse 30, D-95603 Marktredwitz, Germany
M. D. Dyar
Affiliation:
Department of Earth and Environment, Mount Holyoke College, South HadleyMA 01075, USA
*
*E-mail: [email protected]
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Abstract

Analysis of the near-infrared (NIR) spectral bands of phyllosilicates, together with the mid-infrared bands, enables testing and confirmation of band assignments for the structural OH vibrations. Spectral analyses of selected smectites and serpentine-kaolin minerals are presented here. The results of this study indicate that dioctahedral smectites may contain both in-plane and out-of-plane OH-bending vibrations, as suggested by Farmer (1974). In-plane bands occur near 800 ­ 915 cm–1, while the weaker out-of-plane vibrations occur near 600 ­ 700 cm–1 and are enhanced in dioctahedral smectites when the structure is disrupted by substitutions. Analysis of the OH-stretching vibrations and their NIR overtone bands is also presented for both smectites and serpentine-kaolin minerals. These overtones are more straightforward for serpentines than for kaolinite, and a strong overtone associated with the kaolinite OH-stretching band at 3620 cm–1 is found that supports its assignment as an OH-stretching band.

Keywords

infrared spectroscopysmectitesserpentineskaolinitestructural OH
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 4 , December 2002 , pp. 617 - 628
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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