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A Raman microprobe study of natural micas

Published online by Cambridge University Press:  05 July 2018

A. Tlili
Affiliation:
Laboratoire de Minéralogie, Muséum National d'Histoire Naturelle, 61 rue de Buffon, 75005 Paris, France
D. C. Smith
Affiliation:
Laboratoire de Minéralogie, Muséum National d'Histoire Naturelle, 61 rue de Buffon, 75005 Paris, France
J.-M. Beny
Affiliation:
CNRS-CRSCM, 1A rue de la Férollerie, 45071 Orléans, France
H. Boyer
Affiliation:
ISA Jobin-Yvon, 16–18 rue du Canal, 91160 Longjumeau, France

Abstract

A wide range of natural K-, Na-, Ca- or (K + Li)-micas have been systematically examined by Raman spectrometry. The spectra are interpretable in terms of regular variations in peak positions and chemical parameters. Several vibrations give higher wavenumbers for Na-micas compared to K-micas, in accord with the smaller ionic size of Na+ than K+. The ≈195 cm-1 and ≈270 cm-1 peak wavenumbers and intensities vary as functions of the chemistry of the octahedral sites, i.e. the replacement of Mg2+ by Mn2+, Zn2+, Cr3+, Fe3+, Ti4+, and especially by Al3+, or by a vacancy, and the replacement of (OH)- by F-. The group of ≈700 cm-1 peaks vary in wavenumber and intensity with the replacement of Si by Al in the tetrahedra; distinct Si-O-Si and Si-O-Al vibrations can be recognized. Di- and tri-octahedral micas are distinguished on the basis of certain relative peak intensities which vary considerably with polarization direction, and of trends with increasing Al(iv), Al(vi) or Al(tot.). Calibration of these trends for the chemical analysis of mica microinclusions seems feasible once the uncertainties in the data set are resolved by the determination of further samples selected to highlight the effect of specific elements.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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