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Infrared and Mössbauer spectroscopy of Fe-rich smectites from Morrón de Mateo bentonite deposit (Spain)

Published online by Cambridge University Press:  21 February 2018

M. Pelayo*
Affiliation:
Department of Environment, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
J. F. Marco
Affiliation:
Institute of Physical Chemistry Rocasolano, CSIC, Calle Serrano 119, 28006 Madrid, Spain
A. M. Fernández
Affiliation:
Department of Environment, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
L. Vergara
Affiliation:
Institute of Physical Chemistry Rocasolano, CSIC, Calle Serrano 119, 28006 Madrid, Spain
A. M. Melón
Affiliation:
Department of Environment, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
L. Pérez del Villar
Affiliation:
Department of Environment, CIEMAT, Avenida Complutense 40, 28040 Madrid, Spain
*

Abstract

The Morrón de Mateo bentonite deposit has been studied as a natural analogue of the thermal effect on the bentonite barrier of a geological radioactive waste repository. This deposit was intruded by a volcanic dome that induced hydrothermal activity affecting the smectite clay minerals close to the dome. Previous studies of proximal bentonites indicated that Al-montmorillonites were transformed into Fe-rich smectites with intermediate composition between beidellite and saponite through gradual steps formed by smectites increasingly rich in Mg and Fe. In order to confirm the suggested transformation and the Fe distribution into the smectites, infrared and Mössbauer spectroscopy studies were performed. Infrared spectra of samples away from the dome show typical bands for montmorillonite type with prevailing Al in octahedral positions, while proximal samples also show bands of Fe-rich smectites. Mössbauer data confirm that Fe present in the fine fraction of bentonites is fundamentally located in the smectites structure, mainly as octahedrally coordinated Fe(III). Proximal smectites have a considerably more distorted octahedral environment for Fe(III) which probably stemmed from a significant degree of substitution of Al by Fe(III). These results confirm that an alteration process occurred related to the volcanic intrusion which produced an increase in temperature and Fe-rich solutions responsible for the transformation of Al-montmorillonites.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Juan Cornejo

References

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