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Vermiculite, with hydroxy-aluminium interlayer, and kaolinite formation in a subtropical sandy soil from south Brazil

Published online by Cambridge University Press:  09 July 2018

E. C. Bortoluzzi ,
B. Velde ,
M. Pernes ,
J. C. Dur  and
D. Tessier
E. C. Bortoluzzi
Affiliation:
Faculdade de Agronomia e Medicina Veterinária, Fundação Universidade de Passo Fundo (FAMV-FUPF), 611, 99051-000 Passo Fundo, Rio Grande do Sul, Brazil
B. Velde
Affiliation:
Département de Géologie, Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris – Cedex 05, France
M. Pernes
Affiliation:
Institut National de la Recherche Agronomique (INRA), Unité PESSAC, Route de Saint-Cyr, 78026 Versailles Cedex, France
J. C. Dur
Affiliation:
Institut National de la Recherche Agronomique (INRA), Unité PESSAC, Route de Saint-Cyr, 78026 Versailles Cedex, France
D. Tessier*
Affiliation:
Institut National de la Recherche Agronomique (INRA), Unité PESSAC, Route de Saint-Cyr, 78026 Versailles Cedex, France
*
*E-mail: daniel.tessier@wanadoo.fr
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Abstract

The purpose of this study was to investigate the clay mineral phases in a Rhodic Acrisol soil and to discuss their evolution in subtropical conditions. Prairie and forest soil profiles were sampled and clay fractions of the parent material and soil horizons analysed by X-ray diffraction (XRD) at the Federal University of Santa Maria, Rio Grande do Sul-Brazil. The XRD results show the presence of interstratified kaolinite-smectite and illite-smectite as well as illite in the parent material. These minerals were also found in the soil samples but with two new phases: hydroxy-aluminium interlayered vermiculite (HIV), which showed incomplete collapse with treatment at 550ºC, and a newly formed kaolinite (d = 7.17 Å). Under a subtropical climate and a sandy lithology, HIV and kaolinite appear to be a result of a specific pedogenic clay formation, related to the natural vegetation. Originally, under the prairie area, the intensity of the weathering processes was weak (within 2:1 clay minerals), as only small quantities of kaolinite and Fe oxides, and no evidence of gibbsite, were found.

Keywords

hydroxy-Al interlayersoil genesisparticle-size distributionsandy soilsXRDBrazil
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 2 , June 2008 , pp. 185 - 193
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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