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Rythmic changes in crystal chemistry of trioctahedral Cr-chlorites and Cr entrapment: a SEM, EM and Raman study

Published online by Cambridge University Press:  09 July 2018

A. C. Prieto ,
M. -C. Boiron ,
M. Cathelineau ,
R. Mosser-ruck ,
J . A. Lopez  and
C. García
A. C. Prieto*
Affiliation:
Departamento de Física de la MateriaCondensada, Cristalografía y Mineralogía, Universidad de Valladolid, 47011 Valladolid, Spain
M. -C. Boiron
Affiliation:
UMR CNRS G2R 7566 and CREGU, BP23, 54501, Vandoeuvre les Nancy Cedex, France
M. Cathelineau
Affiliation:
UMR CNRS G2R 7566 and CREGU, BP23, 54501, Vandoeuvre les Nancy Cedex, France
R. Mosser-ruck
Affiliation:
UMR CNRS G2R 7566 and CREGU, BP23, 54501, Vandoeuvre les Nancy Cedex, France
J . A. Lopez
Affiliation:
Departamento de Cristalografía y Mineralogía, Universidad Complutense, 28040 Madrid, Spain
C. García
Affiliation:
Departamento de Física de la MateriaCondensada, Cristalografía y Mineralogía, Universidad de Valladolid, 47011 Valladolid, Spain
*
*E-mail: prieto@fmc.uva.es
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Abstract

Back-scattered scanning electron microscopy (SEM) images of Cr-chlorite crystals from Erzerum (Turkey) reveal that the crystals are chemically inhomogeneous and display complex but well defined crystal zoning characterized by growth bands with contrasting chemical features. The chemical zoning has been investigated at the micron scale using an integrated approach, combining BSEM images, in situ chemical analysis by electron microprobe and Raman spectroscopy. Enrichment in Cr, due to octahedral Al substitution, reaches up to 0.7 atoms per half formula, especially in bands where the Mg content is depleted. These substitutions are also depicted at the micron scale on Raman spectra by changes in the v(OH) band intensities and positions that correlate with the Cr content. The Cr-enrichment occurs thus during specific stages of crystal growth, probably in response to changes in the fluid chemistry controlling the relative availability of Cr, Mg and Al in solution.

Keywords

chloriteCrelectron microprobeRaman spectroscopySEM
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 3 , September 2003 , pp. 339 - 352
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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