From Plinthic Acrisols to Plinthosols and Gleysols: iron and groundwater dynamics in the tertiary sediments of the upper Amazon basin

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dc.contributor.authorFritsch, E.
dc.contributor.authorHerbillon, A. J.
dc.contributor.authorDo Nascimento, N. R.
dc.contributor.authorGrimaldi, M.
dc.contributor.authorMelfi, A. J.
dc.contributor.institutionInst Rech Dev
dc.contributor.institutionUniv Paris 06
dc.contributor.institutionUniv Catholique Louvain
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionCtr IRD France
dc.date.accessioned2014-05-20T15:22:57Z
dc.date.available2014-05-20T15:22:57Z
dc.date.issued2007-10-01
dc.description.abstractTopography has been reported to be the major factor ruling the spatial distribution of Acrisols, Plinthosols and Gleysols on the seasonally flooded, low elevation plateaux of the upper Amazon basin occupied by Tertiary (Ica & Solimoes) sediments. In this study, detailed morphological and mineralogical investigations conducted in a representative 25-ha site were combined with hydro-geochemical data to relate the vertical and lateral soil differentiations observed to the hydro-geological history of that part of the basin. As a result of the uplift of the Andes, several cuts in the extensive Tertiary marshlands have formed, at first, slightly incised plateaux of low elevation. There, weathering under hot and humid climates would have generated a reddish, freely drained and bioturbated topsoil layer and the vertical differentiation in subsoil sediments of a plinthite over an iron-depleted mottled clay. The second episode of soil differentiation is linked to the replacement of the forest by a savannah under the drier climates of the late Pleistocene, which favours surface runoff and the infill of the incisions by fine particles. This infill, combined with the return to the present humid climate, has then enabled the local groundwater to rise on the plateaux and to generate episaturation at the topsoil/subsoil transition close to the depressions. Nowadays, ferrous iron is released from the partly iron-depleted topsoil weathering front at high water levels during the rainy seasons. It moves from footslope to low-lying positions and from top to bottom in the soil profile according to the groundwater dynamics. The present general trend is thus to the lateral export of iron at high water levels due to subsurface and overland flows, its vertical transfer during the recession of the groundwater and accumulation in a nodular plinthite. In the latter, ferrous iron is adsorbed onto its softest iron masses where it feeds the neoformation of ferrihydrite that rapidly dehydrates into haematite.en
dc.description.affiliationInst Rech Dev, IRD, CEREGE, UMR 161, F-13545 Aix En Provence, France
dc.description.affiliationUniv Paris 06, CNRS 7590, Inst Mineral Phys Milieux Condenses, IMPMC,UMR, F-75252 Paris 05, France
dc.description.affiliationUniv Catholique Louvain, Unite Sci Sol, B-1348 Louvain La Neuve, Belgium
dc.description.affiliationUNESP, Inst Geosci Ciências Exatas, DEPLAN, BR-13500 Rio Claro, SP, Brazil
dc.description.affiliationUniv São Paulo, Nucleo Pesquisa Geoquim Litosfera, NUPEGEL, BR-13418 Piracicaba, SP, Brazil
dc.description.affiliationCtr IRD France, UMR 137, F-93143 Bondy, France
dc.description.affiliationUnespUNESP, Inst Geosci Ciências Exatas, DEPLAN, BR-13500 Rio Claro, SP, Brazil
dc.format.extent989-1006
dc.identifierhttp://dx.doi.org/10.1111/j.1365-2389.2006.00877.x
dc.identifier.citationEuropean Journal of Soil Science. Malden: Wiley-blackwell Publishing, Inc., v. 58, n. 5, p. 989-1006, 2007.
dc.identifier.doi10.1111/j.1365-2389.2006.00877.x
dc.identifier.issn1351-0754
dc.identifier.lattes0510319144819921
dc.identifier.urihttp://hdl.handle.net/11449/33833
dc.identifier.wosWOS:000249428200001
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofEuropean Journal of Soil Science
dc.relation.ispartofjcr2.644
dc.relation.ispartofsjr1,440
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleFrom Plinthic Acrisols to Plinthosols and Gleysols: iron and groundwater dynamics in the tertiary sediments of the upper Amazon basinen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderWiley-Blackwell
unesp.author.lattes0510319144819921
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Planejamento Territorial e Geoprocessamento - IGCE