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Experimental alteration of Mg-vermiculite under hydrothermal conditions: formation of mixed-layered saponite-chlorite minerals

Published online by Cambridge University Press:  09 July 2018

R. Mosser-Ruck ,
J . Pironon ,
D. Guillaume  and
M. Cathelineau
R. Mosser-Ruck*
Affiliation:
CNRS, UMR 7566 Géologie et Gestion des Ressources minérales et énergétiques – CREGU et Université Henri Poincaré, BP 239-54506 Vandoeuvre-lès-Nancy cedex, France
*
*E-mail: [email protected]
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Abstract

The hydrothermal reactivity of a Mg-vermiculite from Santa Olalla (Spain) was studied experimentally at 150 and 300ºC, 75 and 100 bars, respectively, in (Na,K,Ca,Mg) chloride and sulphate solutions (liquid/solid ratio = 10). The formation of mixed-layer clays is demonstrated by FT-IR spectroscopy, X-ray diffraction (XRD) and electron microprobe. The gradual decrease of the 3220 cm–1 infrared band intensity, characteristic of free water, is interpretated as the dehydration of the interlayer Mg cation of the vermiculite. The presence of ‘brucite type’ sheets is also observed by the increase of 3555 cm–1 and 3420 cm–1 band intensities. The XRD results show that run products are able to expand when glycolated. Microprobe analyses document the decrease of IVSi content and a significant enrichment in Mg in the run products. The formation of a mixed-layer clay comprising saponite and chlorite layers is proposed.

Keywords

vermiculitechloritesaponiteXRDmicroprobe dataFT-IR
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 3 , September 2003 , pp. 303 - 314
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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