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

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Prieto Colorado, A.C. y Boiron, Marie Christine y Cathelineau, Michel y Mosser-Ruck, R. y López García, José Ángel y García, C. (2003) Rythmic changes in crystal chemistry of trioctahedral Cr-chlorites and Cr entrapment: a SEM, EM and Raman study. Clay minerals, 38 . pp. 339-352. ISSN 0009-8558

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URL Oficial: http://www.minersoc.org/pages/e_journals/clay.html



Resumen

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 n(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.


Tipo de documento:Artículo
Palabras clave:Chlorite, Cr, Electron microprobe, Raman spectroscopy, SEM
Materias:Ciencias > Geología > Cristalografía
Código ID:20186
Depositado:28 Feb 2013 13:22
Última Modificación:11 Dic 2018 08:46

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