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Organic Control of Dioctahedral and Trioctahedral Clay Formation in an Alkaline Soil System in the Pantanal Wetland of Nhecolândia, Brazil

Barbiero, Laurent ; Berger, Gilles ; Rezende Filho, Ary T ; Meunier, Jean-François ; Martins-Silva, Elisângela R ; Furian, Sonia Yang, Gang

PloS one, 2016-07, Vol.11 (7), p.e0159972-e0159972 [Periódico revisado por pares]

United States: Public Library of Science

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Título:
Organic Control of Dioctahedral and Trioctahedral Clay Formation in an Alkaline Soil System in the Pantanal Wetland of Nhecolândia, Brazil
Autor: Barbiero, Laurent ; Berger, Gilles ; Rezende Filho, Ary T ; Meunier, Jean-François ; Martins-Silva, Elisângela R ; Furian, Sonia
Yang, Gang
Assuntos: Agricultural sciences ; Alkalies - analysis ; Alkaline soils ; Alkalinity ; Aluminum ; Aluminum Silicates - chemistry ; Brazil ; Chemical bonds ; Chemical elements ; Chemical precipitation ; Clay ; Clay minerals ; Cobalt ; Colloids ; Continental interfaces, environment ; Dissolved organic carbon ; Earth Sciences ; Ecology and Environmental Sciences ; Filtration ; Geochemistry ; Geologic Sediments - chemistry ; Hydrology ; Illite ; Iron ; Iron content ; Lakes ; Life Sciences ; Magnesium ; Measuring instruments ; Membranes ; Metals - analysis ; Mica ; Mineralization ; Mineralogy ; Minerals ; Organic matter ; Organic soils ; Oxygen ; Peroxide ; Physical Sciences ; Pore size ; Porosity ; Saponite ; Sciences of the Universe ; Sediments ; Smectites ; Soil - chemistry ; Soil solution ; Soil study ; Soils ; Spatial distribution ; Stevensite ; Wetlands
É parte de: PloS one, 2016-07, Vol.11 (7), p.e0159972-e0159972
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
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Conceived and designed the experiments: LB GB ARF. Performed the experiments: LB GB ARF. Analyzed the data: LB GB JFM SF. Contributed reagents/materials/analysis tools: LB ARF. Wrote the paper: LB GB ARF ERMS SF.
Competing Interests: The authors have declared that no competing interests exist.
These authors also contributed equally to this work.
Current address: Centro de Energia Nuclear na Agricultura (CENA), Universidade de São Paulo, Avenida Centenário 303, 13400–970, Piracicaba, São Paulo, Brazil
Current address: Instituto de Química (IQ), Universidade Estadual de Campinas, P.O. Box 6154, 13083–970 Campinas, SP, Brazil
Descrição: Recent studies have focused on the formation of authigenic clays in an alkaline soil system surrounding lakes of the Nhecolândia region, Pantanal wetland. The presence of trioctahedral Mg-smectites (stevensite and saponite types), which requires low Al and Fe contents in the soil solution for its formation, contrasts with the neoformation of dioctahedral Fe-mica (glauconite, and Fe-illite), which instead requires solutions relatively enriched in Al and Fe. This study aims to understand the conditions of co-existence of both, Mg-smectite and Fe-mica a common clay association in former or modern alkaline soil systems and sediments. The study was carried out along an alkaline soil catena representative of the region. The soil organization revealed that Mg-smectite occur in top soil close to the lake, whereas Fe-mica dominate in the clay fraction of deeper greenish horizons a few meters apart. We propose here that this spatial distribution is controlled by the lateral transfer of Fe and Al with organic ligands. Alkaline organic rich solutions (DOC up to 738 mg L-1) collected in the watertable were centrifuged and filtered through membranes of decreasing pore size (0.45 μm, 0.2 μm, 30 KDa, 10 KDa, 3 KDa) to separate colloidal and dissolved fractions. Fe, Al, Si, Mg and K were analysed for each fraction. Although the filtration had no influence on Si and K contents, almost 90% of Fe (up to 2.3 mg L-1) and Al (up to 7 mg L-1) are retained at the first cutoff threshold of 0.45μm. The treatment of the same solutions by oxygen peroxide before filtration shows that a large proportion of Fe and Al were bonded to organic colloids in alkaline soil solution at the immediate lake border, allowing Mg-smectite precipitation. The fast mineralization of the organic matter a few meters apart from the lake favors the release of Fe and Al necessary for Fe-mica neoformation. In comparison with chemical and mineralogical characteristics of alkaline environments described in the literature, the study suggests that the co-existence of trioctahedral Mg-smectite and dioctahedral Fe-mica should be regarded as a standard occurrence in alkaline soil systems with organic rich waters.
Editor: United States: Public Library of Science
Idioma: Inglês

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Organic Control of Dioctahedral and Trioctahedral Clay Formation in an Alkaline Soil System in the Pantanal Wetland of Nhecolândia, Brazil

Barbiero, Laurent ; Berger, Gilles ; Rezende Filho, Ary T ; Meunier, Jean-François ; Martins-Silva, Elisângela R ; Furian, Sonia Yang, Gang

United States: Public Library of Science

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