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Iron mineralogy of a grey Oxisol from the Jequitinhonha River Basin, Minas Gerais, Brazil

Published online by Cambridge University Press:  09 July 2018

A. C. Silva ,
F. H. A. Bispo ,
S. De Souza ,
J. D. Ardisson ,
A. J. S. Viana ,
M. C. Pereira ,
F. R. Costa ,
E. Murad  and
J. D. Fabris
A. C. Silva
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
F. H. A. Bispo
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
S. De Souza
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
J. D. Ardisson
Affiliation:
Centro de Desenvolvimento da Tecnologia Nuclear, 31270-901, Belo Horizonte, Minas Gerais, Brazil
A. J. S. Viana
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
M. C. Pereira
Affiliation:
Instituto de Ciência e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39803-371, Teófilo Otoni, Minas Gerais, Brazil
F. R. Costa
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
E. Murad*
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
J. D. Fabris
Affiliation:
Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), 39100-000, Diamantina, Minas Gerais, Brazil
*
*E-mail: emurad@yahoo.com
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Abstract

The mineralogy of the silt fraction of a 1.5 m-deep, well developed, intensely weathered, greyish soil profile from a toposequence on a tableland covered by agricultural crops in the upper valley of the Jequitinhonha river basin, Minas Gerais, Brazil, has been studied by X-ray powder diffraction, 57Fe Mössbauer spectroscopy at 298 K and 80 K, and vibrating sample magnetometry. Mössbauer data collected at room temperature indicated about 17 atom% of the iron content of the sample to be structural Fe2+ in phyllosilicates, which X-ray diffraction showed to be mainly halloysite and kaolinite. The magnetization curve also indicates the presence of a ferrimagnetic phase, tentatively identified by Mössbauer spectroscopy as maghemite (γ-Fe2O3).

These findings support a pedogenetic model for this soil profile, by which the remaining Fe2+ bearing minerals were first formed under relatively anoxic palaeo-conditions of an intense hydric regime. Subsequent drier local conditions, due to a much improved drainage, favoured intensive weathering, leading to the presently developed Oxisol. Even under the more oxidative conditions, part of the Fe2+ -containing phyllosilicates still remained in the profile, which is believed to impart the rather unusual greyish colour (Munsell 10YR 3/2) to this deep tropical soil.

Keywords

soilOxisolcolourgenesishalloysitekaoliniteX-ray diffractionmagnetizationMössbauer spectroscopyironiron (hydr)oxides
Type
Research Article
Information
Clay Minerals , Volume 48 , Issue 5 , December 2013 , pp. 713 - 723
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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