Characterization and environmental interpretation of a floodplain Holocene paleosoil: Implications for paleohydrological reconstructions in the Upper Paraná River, Brazil

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dc.contributor.authorStevaux, José C.
dc.contributor.authorBarczysczyn, Olga [UNESP]
dc.contributor.authorMedeanic, Svetlana
dc.contributor.authorde Nóbrega, Maria Teresa
dc.contributor.institutionUniversidade Guarulhos
dc.contributor.institutionUniversidade Estadual de Maringá (UEM)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Rio Grande do Sul (UFRGS)
dc.date.accessioned2014-05-27T11:22:20Z
dc.date.available2014-05-27T11:22:20Z
dc.date.issued2006-12-01
dc.description.abstractAlluvial paleosoil horizons from the 3 to 4 m high banks of the Paraná River were used to reconstruct the palaeoenvironmental history and palaeohydrological regime of the river. The bank consists of a Middle to Late Holocene sequence of sandy to silty clay layers of overbank deposits. The paleosoil horizon is located to a depth of 1.95 m from the top of the bank and is recognized as a guide horizon throughout the floodplain of the Upper Paraná River floodplain. Analyses of organic matter (δ13C and humic/fulvic acids), palynology (pollen and charcoal fragments), magnetic susceptibility, micromorphology, x-ray diffraction and 14C dating were conducted for samples from two representative profiles of the study area. Two phases were characterized in the history of the river: 1) An older phase, of stability in fluvial hydrology (stasis) with low frequency of floods, which produced conditions for soil development (14C 1700 ± 70 yr. BP). At this period, the predominance of herbaceous vegetation (determinated by pollen and δ13C analyses) suggests a climate less humid than the present one, and 2) A second phase, when climate changed to the present conditions of humidity (annual rain fall of 1600 rum) and characterized by the predominance of C3 plants. Under this new hydrological regime, the river developed an agradational floodplain, with a depositional sedimentary rate of 1.2 mm.y-1. © 2006 Gebrüder Borntraeger.en
dc.description.affiliationUniversidade Guarulhos, Pr. Tereza Cristina, 1, 0730-070, Guarulhos, SP
dc.description.affiliationUniversidade Estadual de Maringá Dept. of Geografia, Maringá, PR
dc.description.affiliationUNESP, Rio Claro, SP
dc.description.affiliationSvetlana Medeanic UFRGS Geociências and CECO, Porto Alegre, RS
dc.description.affiliationMaria Teresa de Nóbrega Universidade Estadual de Maringá Department of Geografia, Maringá, PR
dc.description.affiliationUnespUNESP, Rio Claro, SP
dc.format.extent191-206
dc.identifierhttp://www.schweizerbart.de/publications/detail/isbn/9783443211455/Zeitschr_f_Geomorphologie_Suppl_Bd_145_Tropical_Ge
dc.identifier.citationZeitschrift fur Geomorphologie, Supplementband, v. 145, p. 191-206.
dc.identifier.issn0044-2798
dc.identifier.scopus2-s2.0-38849155855
dc.identifier.urihttp://hdl.handle.net/11449/69399
dc.language.isoeng
dc.relation.ispartofZeitschrift fur Geomorphologie, Supplementband
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectfloodplain
dc.subjectHolocene
dc.subjectmagnetic susceptibility
dc.subjectpaleoenvironment
dc.subjectpaleohydrology
dc.subjectpaleosol
dc.subjectpalynology
dc.subjectParana River
dc.subjectSouth America
dc.titleCharacterization and environmental interpretation of a floodplain Holocene paleosoil: Implications for paleohydrological reconstructions in the Upper Paraná River, Brazilen
dc.typeArtigo

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