Reconstructing fluvial bar surfaces from compound cross-strata and the interpretation of bar accretion direction in large river deposits

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dc.citation.issue3
dc.citation.volume63
dc.contributor.authorAlmeida, Renato Paes de
dc.contributor.authorFreitas, Bernardo Tavares
dc.contributor.authorTurra, Bruno Boito
dc.contributor.authorFigueiredo, Felipe Torres
dc.contributor.authorMarconato, Andre
dc.contributor.authorJanikian, Liliane [UNIFESP]
dc.coverageHoboken
dc.date.accessioned2020-08-21T16:59:40Z
dc.date.available2020-08-21T16:59:40Z
dc.date.issued2016
dc.description.abstractThe interpretation of fluvial styles from the rock record is based for a significant part on the identification of different types of fluvial bars, characterized by the geometric relationship between structures indicative of palaeocurrent and surfaces interpreted as indicative of bar form and bar accretion direction. These surfaces of bar accretion are the boundaries of flood-related bar increment elements, which are typically less abundant in outcrops than what would be desirable, particularly in large river deposits in which each flood mobilizes large volumes of sediment, causing flood-increment boundary surfaces to be widely spaced. Cross-strata set boundaries, on the other hand, are abundant and indirectly reflect the process of unit bar accretion, inclined due to the combined effect of the unit bar surface inclination and the individual bedform climbing angle, in turn controlled by changes in flow structure caused by local bar-scale morphology. This work presents a new method to deduce the geometry of unit bar surfaces from measured pairs of cross-strata and cross-strata set boundaries. The method can be used in the absence of abundant flood-increment bounding surfaces; the study of real cases shows that, for both downstream and laterally accreting bars, the reconstructed planes are very similar to measured bar increment surfaces.en
dc.description.affiliationUniv Sao Paulo, Inst Energia & Ambiente, Av Prof Luciano Gualberto 1289,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Geociencias, Rua Lago 562,Cidade Univ, BR-05508900 Sao Paulo, SP, Brazil|Univ Fed Itajuba, Inst Recursos Nat, Av BPS 1303, BR-37500903 Itajuba, MG, Brazil
dc.description.affiliationCPRM Geol Survey Brazil, Rua Costa 55, BR-01304010 Sao Paulo, SP, Brazil
dc.description.affiliationUniv Fed Sergipe, Dept Geol, Av Marechal Rondom S-N, BR-49100000 Sao Cristov, SE, Brazil
dc.description.affiliationUniv Fed Sao Paulo, Campus Baixada Santista, BR-11030400 Santos, SP, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo, Campus Baixada Santista, BR-11030400 Santos, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIDFAPESP: 2009/53363-8
dc.description.sponsorshipIDFAPESP: 2009/52807-0
dc.description.sponsorshipIDFAPESP: 2009/51766-8
dc.description.sponsorshipIDFAPESP: 2010/51103-6
dc.description.sponsorshipIDFAPESP: 2010/51559-0
dc.description.sponsorshipIDFAPESP: 2013/01825-3
dc.description.sponsorshipIDFAPESP: 2014/16739-8
dc.description.sponsorshipIDCAPES: PROEX-558/2011
dc.description.sponsorshipIDCNPq: 301774/2012-9
dc.description.sponsorshipIDCNPq: 301775/2012-5
dc.format.extent609-628
dc.identifierhttps://dx.doi.org/10.1111/sed.12230
dc.identifier.citationSedimentology. Hoboken, v. 63, n. 3, p. 609-628, 2016.
dc.identifier.doi10.1111/sed.12230
dc.identifier.fileWOS000372342200004.pdf
dc.identifier.issn0037-0746
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/57734
dc.identifier.wosWOS:000372342200004
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofSedimentology
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectArchitectural elementsen
dc.subjectBar geometry reconstructionen
dc.subjectCross-strata set boundariesen
dc.subjectFluvial depositional systemsen
dc.subjectPalaeocurrentsen
dc.titleReconstructing fluvial bar surfaces from compound cross-strata and the interpretation of bar accretion direction in large river depositsen
dc.typeinfo:eu-repo/semantics/article
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