Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process
ABSTRACT Pedological studies using X-ray diffraction (XRD), X-ray fluorescence (XRF), optical microscopy, and scanning electron microscopy (SEM-EDS) showed a Xanthic Ferralsol formed from the degradation of bauxite on a slope in the Caparaó region, in southeastern Brazil. We found a decrease in the...
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Sociedade Brasileira de Ciência do Solo
2017-11-01
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doaj-d9fdb3fa217247c2ba5364c6861f66942021-01-02T00:34:52ZengSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo1806-96572017-11-0141010.1590/18069657rbcs20160507S0100-06832017000100314Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming ProcessAna Carolina Campos MateusFábio Soares de OliveiraAngélica Fortes Drummond Chicarino VarajãoCaroline Cibele Vieira SoaresABSTRACT Pedological studies using X-ray diffraction (XRD), X-ray fluorescence (XRF), optical microscopy, and scanning electron microscopy (SEM-EDS) showed a Xanthic Ferralsol formed from the degradation of bauxite on a slope in the Caparaó region, in southeastern Brazil. We found a decrease in the number and size of bauxite fragments toward the top of the profiles, bauxite fragments that were more degraded at the top of the profiles, transformation of gibbsite into kaolinite, and absolute enrichment in silicon in the mass balance. These indicators suggest that resilication could be the major process responsible for formation of the soil; detailed studies are needed to verify the origin of the silica. The reintroduction of silica into the system occurs by the biogeochemical cycling of vegetation and, in some cases, water table fluctuations, highlighting the role of resilication as a soil-forming process in bauxite-derived soils.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100314&lng=en&tlng=enpedogenesisFerralsolkaolinitemicromorphology |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ana Carolina Campos Mateus Fábio Soares de Oliveira Angélica Fortes Drummond Chicarino Varajão Caroline Cibele Vieira Soares |
spellingShingle |
Ana Carolina Campos Mateus Fábio Soares de Oliveira Angélica Fortes Drummond Chicarino Varajão Caroline Cibele Vieira Soares Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process Revista Brasileira de Ciência do Solo pedogenesis Ferralsol kaolinite micromorphology |
author_facet |
Ana Carolina Campos Mateus Fábio Soares de Oliveira Angélica Fortes Drummond Chicarino Varajão Caroline Cibele Vieira Soares |
author_sort |
Ana Carolina Campos Mateus |
title |
Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process |
title_short |
Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process |
title_full |
Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process |
title_fullStr |
Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process |
title_full_unstemmed |
Genesis of Soils from Bauxite in Southeastern Brazil: Resilication as a Soil-Forming Process |
title_sort |
genesis of soils from bauxite in southeastern brazil: resilication as a soil-forming process |
publisher |
Sociedade Brasileira de Ciência do Solo |
series |
Revista Brasileira de Ciência do Solo |
issn |
1806-9657 |
publishDate |
2017-11-01 |
description |
ABSTRACT Pedological studies using X-ray diffraction (XRD), X-ray fluorescence (XRF), optical microscopy, and scanning electron microscopy (SEM-EDS) showed a Xanthic Ferralsol formed from the degradation of bauxite on a slope in the Caparaó region, in southeastern Brazil. We found a decrease in the number and size of bauxite fragments toward the top of the profiles, bauxite fragments that were more degraded at the top of the profiles, transformation of gibbsite into kaolinite, and absolute enrichment in silicon in the mass balance. These indicators suggest that resilication could be the major process responsible for formation of the soil; detailed studies are needed to verify the origin of the silica. The reintroduction of silica into the system occurs by the biogeochemical cycling of vegetation and, in some cases, water table fluctuations, highlighting the role of resilication as a soil-forming process in bauxite-derived soils. |
topic |
pedogenesis Ferralsol kaolinite micromorphology |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100314&lng=en&tlng=en |
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