A comparative evaluation of the CF:CS and CRS models in Pb-210 chronological studies applied to hydrographic basins in Brazil

dc.contributorUniversidade Estadual Paulista (Unesp)
dc.contributorUniv Seville
dc.creatorBonotto, D. M. [UNESP]
dc.creatorGarcia-Tenorio, R.
dc.date2015-03-18T15:53:17Z
dc.date2015-03-18T15:53:17Z
dc.date2014-09-01
dc.date.accessioned2023-09-09T11:04:23Z
dc.date.available2023-09-09T11:04:23Z
dc.identifierhttp://dx.doi.org/10.1016/j.apradiso.2014.06.012
dc.identifierApplied Radiation And Isotopes. Oxford: Pergamon-elsevier Science Ltd, v. 92, p. 58-72, 2014.
dc.identifier0969-8043
dc.identifierhttp://hdl.handle.net/11449/116417
dc.identifier10.1016/j.apradiso.2014.06.012
dc.identifierWOS:000341476700011
dc.identifier7430102726026121
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8765902
dc.descriptionThe Constant Flux: Constant Sedimentation (CF:CS) and Constant Rate of Supply (CRS) of unsupported/excess Pb-210 models have been applied to a Pb-210 data set providing of eighteen sediments profiles sampled at four riverine systems occurring in Brazil, South America: Corumbatai River basin (S1=Site 1, Sao Paulo State), Atibaia River basin (S2=Site 2, Sao Paulo State), Ribeirao dos Bagres basin (S3=Site 3, Sao Paulo State) and Amazon River mouth. (S4=Site 4, Amapa State). These sites were chosen for a comparative evaluation of the performance of the CF:CS and CRS models due to their pronounced differences on the geographical location, geological context, soil composition, biodiversity, climate, rainfall, and water flow regime, among other variable aspects. However, all sediments cores exhibited a common denominator consisting on a database built from the use of the same techniques for acquiring the sediments major chemical composition (SiO2, Al2O3, Na2O, K2O, CaO, MgO, Fe2O3, MnO, P2O5, TiO2 and LOI-Loss on Ignition) and unsupported/excess 210Pb activity data. In terms of sedimentation rates, the performance of the CRS model was better than that of the CF:CS model as it yielded values more compatible with those expected from field evidences. Under the chronological point of view, the CRS model always provided ages within the permitted range of the Pb-210-method in the studied sites, whereas the CF:CS model predicted some values above 150 years. The SiO2 content decreased in accordance with the LOI increase in all cores analyzed and such inverse relationship was also tracked in the SiO2-LOI curves of historical trends. The SiO2-LOI concentration fluctuations in sites S1 and S3 also coincided with some Cu and Cr inputs in the drainage systems. (C) 2014 Elsevier Ltd. All rights reserved.
dc.descriptionFundacion Carolina, Madrid, Spain
dc.descriptionUniv Estadual Paulista UNESP, Dept Petrol & Metalogenia, BR-13506900 Sao Paulo, Brazil
dc.descriptionUniv Seville, Dept Fis Aplicada 2, E-41012 Seville, Spain
dc.descriptionUniv Estadual Paulista UNESP, Dept Petrol & Metalogenia, BR-13506900 Sao Paulo, Brazil
dc.format58-72
dc.languageeng
dc.publisherElsevier B.V.
dc.relationApplied Radiation And Isotopes
dc.relation1.123
dc.relation0,528
dc.rightsAcesso restrito
dc.sourceWeb of Science
dc.subjectPb-210-method
dc.subjectCF:CS model
dc.subjectCRS model
dc.subjectSedimentation rate
dc.subjectSiO2-LOI trends
dc.titleA comparative evaluation of the CF:CS and CRS models in Pb-210 chronological studies applied to hydrographic basins in Brazil
dc.typeArtigo


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