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Structure-Composition Relationships in Trioctahedral Chlorites: A Vibrational Spectroscopy Study

Published online by Cambridge University Press:  02 April 2024

A. C. Prieto ,
J. Dubessy  and
M. Cathelineau
A. C. Prieto
Affiliation:
Departamento de Fisica de la Materia Condensada, Cristalografia y Mineralogia, Universidad de Valladolid, 47011, Valladolid, Spain
J. Dubessy
Affiliation:
CREGU and GS CNRS-CREGU, BP 23, 54501, Vandoeuvre les Nancy Cedex, France
M. Cathelineau
Affiliation:
CREGU and GS CNRS-CREGU, BP 23, 54501, Vandoeuvre les Nancy Cedex, France
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Abstract

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Raman and Fourier-transformed infrared spectra of natural trioctahedral chlorites of polytype IIb were obtained for a series of samples characterized by distinct Fe/(Fe + Mg) and Si/Al ratios ranging, respectively, from 0.04 to 0.94 and from 5.18 to 1.86. All samples were characterized by X-ray powder diffraction, and quantitative electron microprobe analysis. In the 3683-3610-cm−1 spectral range, the wave number of the OH-stretching band from the 2:1 layer (band I) decreased with an increase of iron content at constant Al(IV) content. The more intense bands II and III at about 3600 cm−1 and 3500 cm−1, were assigned to hydroxyl groups involved in hydrogen bonds: (SiSi)O... HO, with the hydrogen bonds being roughly perpendicular to the basal plane, and (SiAl)O... HO, respectively. At higher tetrahedral Al and octahedral Fe contents, spectra exhibited OH-bands II and III, respectively, at a lower frequency. Band III intensity increased and band II was enlarged for chlorites displaying higher Al(IV) contents.

In the 1300–1350-cm−1 spectral range, most infrared spectra displayed intense bands at 1090, 1050, 990, and 960 cm−1, which were assigned to T-O stretching of symmetry species Al and E1. The second type of bands observed both in Raman and infrared spectra were at about 650–800 cm−1; they were assigned to OH vibrations and were strongly dependent on the composition of the interlayer octahedral sheet, especially on the Fe content.

Keywords

ChloriteHydroxylInfrared spectroscopyRaman spectroscopyStructure
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 5 , October 1991 , pp. 531 - 539
Copyright
Copyright © 1991, The Clay Minerals Society

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