Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apradiso.2016.10.011 http://hdl.handle.net/11449/173762 |
Resumo: | This study reports the use of the U-series radionuclides 238U and 234U for dating two soil profiles. The soil horizons developed over sandstones from Tatuí and Pirambóia formations at the Paraná sedimentary basin, São Paulo State, Brazil. Chemical data in conjunction with the 234U/238U activity ratios (AR's) of the soil horizons allowed investigating the U-isotopes mobility in the shallow oxidizing environment. Kaolinization and laterization processes are taking place in the profiles sampled, as they are especially common in regions characterized by a wet and dry tropical climate and a water table that is close to the surface. These processes are implied by inverse significant correlations between silica and iron in both soil profiles. Iron oxides were also very important to retain uranium in the two sites investigated, helping on the understanding of the weathering processes acting there. 238U and its progeny 234U permitted evaluating the processes of physical and chemical alteration, allowing the suggestion of a possible timescale corresponding to the Middle Pleistocene for the development of the more superficial soil horizons. |
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Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibriaDatingParaná sedimentary basinSoil profilesUranium isotopesWeathering processesThis study reports the use of the U-series radionuclides 238U and 234U for dating two soil profiles. The soil horizons developed over sandstones from Tatuí and Pirambóia formations at the Paraná sedimentary basin, São Paulo State, Brazil. Chemical data in conjunction with the 234U/238U activity ratios (AR's) of the soil horizons allowed investigating the U-isotopes mobility in the shallow oxidizing environment. Kaolinization and laterization processes are taking place in the profiles sampled, as they are especially common in regions characterized by a wet and dry tropical climate and a water table that is close to the surface. These processes are implied by inverse significant correlations between silica and iron in both soil profiles. Iron oxides were also very important to retain uranium in the two sites investigated, helping on the understanding of the weathering processes acting there. 238U and its progeny 234U permitted evaluating the processes of physical and chemical alteration, allowing the suggestion of a possible timescale corresponding to the Middle Pleistocene for the development of the more superficial soil horizons.Departamento de Petrologia e Metalogenia Universidade Estadual Paulista (UNESP), Câmpus de Rio Claro, Av. 24-A No.1515, C.P. 178, CEP 13506-900Departamento de Petrologia e Metalogenia Universidade Estadual Paulista (UNESP), Câmpus de Rio Claro, Av. 24-A No.1515, C.P. 178, CEP 13506-900Universidade Estadual Paulista (Unesp)Bonotto, Daniel Marcos [UNESP]Jiménez-Rueda, Jairo Roberto [UNESP]Fagundes, Isabella Cruz [UNESP]Filho, Carlos Roberto Alves Fonseca [UNESP]2018-12-11T17:07:37Z2018-12-11T17:07:37Z2017-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article6-15application/pdfhttp://dx.doi.org/10.1016/j.apradiso.2016.10.011Applied Radiation and Isotopes, v. 119, p. 6-15.1872-98000969-8043http://hdl.handle.net/11449/17376210.1016/j.apradiso.2016.10.0112-s2.0-849946672292-s2.0-84994667229.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Radiation and Isotopes0,528info:eu-repo/semantics/openAccess2024-01-02T06:24:07Zoai:repositorio.unesp.br:11449/173762Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:58:09.093886Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
title |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
spellingShingle |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria Bonotto, Daniel Marcos [UNESP] Dating Paraná sedimentary basin Soil profiles Uranium isotopes Weathering processes |
title_short |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
title_full |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
title_fullStr |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
title_full_unstemmed |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
title_sort |
Weathering processes and dating of soil profiles from São Paulo State, Brazil, by U-isotopes disequilibria |
author |
Bonotto, Daniel Marcos [UNESP] |
author_facet |
Bonotto, Daniel Marcos [UNESP] Jiménez-Rueda, Jairo Roberto [UNESP] Fagundes, Isabella Cruz [UNESP] Filho, Carlos Roberto Alves Fonseca [UNESP] |
author_role |
author |
author2 |
Jiménez-Rueda, Jairo Roberto [UNESP] Fagundes, Isabella Cruz [UNESP] Filho, Carlos Roberto Alves Fonseca [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Bonotto, Daniel Marcos [UNESP] Jiménez-Rueda, Jairo Roberto [UNESP] Fagundes, Isabella Cruz [UNESP] Filho, Carlos Roberto Alves Fonseca [UNESP] |
dc.subject.por.fl_str_mv |
Dating Paraná sedimentary basin Soil profiles Uranium isotopes Weathering processes |
topic |
Dating Paraná sedimentary basin Soil profiles Uranium isotopes Weathering processes |
description |
This study reports the use of the U-series radionuclides 238U and 234U for dating two soil profiles. The soil horizons developed over sandstones from Tatuí and Pirambóia formations at the Paraná sedimentary basin, São Paulo State, Brazil. Chemical data in conjunction with the 234U/238U activity ratios (AR's) of the soil horizons allowed investigating the U-isotopes mobility in the shallow oxidizing environment. Kaolinization and laterization processes are taking place in the profiles sampled, as they are especially common in regions characterized by a wet and dry tropical climate and a water table that is close to the surface. These processes are implied by inverse significant correlations between silica and iron in both soil profiles. Iron oxides were also very important to retain uranium in the two sites investigated, helping on the understanding of the weathering processes acting there. 238U and its progeny 234U permitted evaluating the processes of physical and chemical alteration, allowing the suggestion of a possible timescale corresponding to the Middle Pleistocene for the development of the more superficial soil horizons. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 2018-12-11T17:07:37Z 2018-12-11T17:07:37Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apradiso.2016.10.011 Applied Radiation and Isotopes, v. 119, p. 6-15. 1872-9800 0969-8043 http://hdl.handle.net/11449/173762 10.1016/j.apradiso.2016.10.011 2-s2.0-84994667229 2-s2.0-84994667229.pdf |
url |
http://dx.doi.org/10.1016/j.apradiso.2016.10.011 http://hdl.handle.net/11449/173762 |
identifier_str_mv |
Applied Radiation and Isotopes, v. 119, p. 6-15. 1872-9800 0969-8043 10.1016/j.apradiso.2016.10.011 2-s2.0-84994667229 2-s2.0-84994667229.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Radiation and Isotopes 0,528 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
6-15 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129378922528768 |