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dc.contributor.authorSawakuchi, André Oliveira
dc.contributor.authorMendes, Vinicius Ribau
dc.contributor.authorDo Nascimento Pupim, Fabiano
dc.contributor.authorMineli, Thays Desiree
dc.contributor.authorRibeiro, Ligia Maria Almeida Leite
dc.contributor.authorZular, Andre
dc.contributor.authorGuedes, Carlos Conforti Ferreira
dc.contributor.authorGiannini, Paulo César Fonseca
dc.contributor.authorNogueira, Luciana
dc.contributor.authorFilho, William Sallun
dc.contributor.authorAssine, Mario Luis [UNESP]
dc.date.accessioned2018-12-11T17:29:26Z
dc.date.available2018-12-11T17:29:26Z
dc.date.issued2016-06-01
dc.identifierhttp://dx.doi.org/10.1590/2317-488920160030295
dc.identifier.citationBrazilian Journal of Geology, v. 46, p. 209-226.
dc.identifier.issn2317-4692
dc.identifier.issn2317-4889
dc.identifier.urihttp://hdl.handle.net/11449/178238
dc.description.abstractThe development of optically stimulated luminescence (OSL) dating of sediments has led to considerable advance in the geochronology of the Quaternary. OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. In this paper, we show examples of OSL dating of quartz aliquots and single grains from different regions in Brazil, including young coastal-eolian Late Holocene (< 100 years) to Late Pleistocene (∼ 150 ka) fluvial sediments. We discuss the OSL data and ages of sediments from carbonate and terrigenous (distributary and tributary systems) fluvial depositional contexts in Brazil. Most of the studied fluvial sediments show equivalent dose distributions with low to moderate dispersion, suggesting well bleached sediments. The comparison between aliquot and single grain data suggests that high overdispersion in equivalent dose distributions of some samples is more related with sediment mixture due to bioturbation than with incomplete bleaching during transport. Well bleached fluvial sediments contrast with the poor bleached pattern usually described for fluvial sediments in the literature. A large part of the fluvial sedimentary record in Brazil is older than the age limit for quartz OSL dating using blue light stimulation. Thus, isothermal thermoluminescence (ITL) dating protocols were tested for dating of fluvial sands from the Xingu River (eastern Amazonia). The studied sample can recover reliable equivalent doses up to 1600 Gy using the ITL 310°C signal. Therefore, this signal would be suitable to extend the age limit of quartz luminescence to the whole Quaternary or beyond (> 2 Ma) in the low dose rate (0.5-1.0 Gy/ka) environments typical for Brazilian sediments.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent209-226
dc.language.isoeng
dc.relation.ispartofBrazilian Journal of Geology
dc.sourceScopus
dc.subjectBrazilian sediments
dc.subjectOSL dating
dc.subjectQuartz
dc.subjectQuaternary geochronology
dc.titleOptically stimulated luminescence and isothermal thermoluminescence dating of high sensitivity and well bleached quartz from Brazilian sediments: From Late Holocene to beyond the Quaternary?en
dc.typeArtigo
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionCPRM - Serviço Geológico do Brasil
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.contributor.institutionSecretaria do Meio Ambiente
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.description.affiliationInstitute of Geosciences Universidade de São Paulo - USP
dc.description.affiliationCPRM - Serviço Geológico do Brasil
dc.description.affiliationDepartment of Geology Universidade Federal do Paraná - UFPR
dc.description.affiliationGeological Institute Governo do Estado de São Paulo Secretaria do Meio Ambiente
dc.description.affiliationDepartment of Applied Geology Institute of Geosciences and Exact Sciences Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP
dc.description.affiliationUnespDepartment of Applied Geology Institute of Geosciences and Exact Sciences Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP
dc.identifier.doi10.1590/2317-488920160030295
dc.identifier.scieloS2317-48892016000700209
dc.rights.accessRightsAcesso aberto
dc.description.sponsorshipIdFAPESP: 2009/53988-8
dc.description.sponsorshipIdFAPESP: 2013/21942-4
dc.description.sponsorshipIdFAPESP: 2014/06889-2
dc.description.sponsorshipIdFAPESP: 2014/14433-9
dc.description.sponsorshipIdFAPESP: 2014/23334-4
dc.identifier.scopus2-s2.0-84984677358
dc.identifier.fileS2317-48892016000700209.pdf
dc.relation.ispartofsjr0,608
dc.relation.ispartofsjr0,608
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