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Characteristics of clays in an Oxisol-Spodosol toposequence in Amazonia (Brazil)

Published online by Cambridge University Press:  09 July 2018

S. Bravard  and
D. Righi
S. Bravard
Affiliation:
UA 721 du CNRS, Laboratoire de Pédologie, Faculté des Sciences, 86022 Poitiers Cédex, France
D. Righi
Affiliation:
UA 721 du CNRS, Laboratoire de Pédologie, Faculté des Sciences, 86022 Poitiers Cédex, France
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Abstract

The clay fraction of soils from a toposequence developed on a sandy clay Tertiary sediment in the Brazilian Amazonia was studied. Clayey Acrorthox located at the upper part of the sequence have transformed progressively into sandy Tropohumods down the slope. Along the slope important chemical and mineralogical changes linked to modifications in the weathering conditions were observed. In the Acrorthox the hydrolysis process largely prevails and the clay fraction is composed mainly of Fe-rich kaolinite. Fe and Al amorphous compounds become increasingly abundant along the slope. In the Spodosols, hydrolysis and acidocomplexolysis processes have both been effective, and the clay fractions contain not only more gibbsite, but also amorphous materials which are particularly abundant in the Bh horizons.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 3 , September 1988 , pp. 279 - 289
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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