Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil

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dc.contributor.authorVesely, Fernando F.
dc.contributor.authorTrzaskos, Barbara
dc.contributor.authorKipper, Felipe
dc.contributor.authorAssine, Mario Luis [UNESP]
dc.contributor.authorSouza, Paulo A.
dc.contributor.institutionUniv Fed Parana
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Fed Rio Grande do Sul
dc.date.accessioned2018-11-26T16:16:33Z
dc.date.available2018-11-26T16:16:33Z
dc.date.issued2015-08-01
dc.description.abstractThe Parana Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa. In this paper we document the sedimentary record associated with an ice margin that reached the eastern border of the Parana Basin during the Pennsylvanian, with the aim of interpreting the depositional environments and discussing paleogeographic implications. The examined stratigraphic succession is divided in four stacked fades associations that record an upward transition from subglacial to glaciomarine environments. Deposition took place during deglaciation but was punctuated by minor readvances of the ice margin that deformed the sediment pile. Tillites, well-preserved landforms of subglacial erosion and glaciotectonic deformational structures indicate that the ice flowed to the north and northwest and that the ice margin did not advance far throughout the basin during the glacial maximum. Consequently, time-equivalent glacial deposits that crop out in other localities of eastern Parana Basin are better explained by assuming multiple smaller ice lobes instead of one single large glacier. These ice lobes flowed from an ice cap covering uplifted lands now located in western Namibia, where glacial deposits are younger and occur confined within paleovalleys cut onto the Precambrian basement. This conclusion corroborates the idea of a topographically-controlled ice-spreading center in southwestern Africa and does not support the view of a large polar ice sheet controlling deposition in the Parana Basin during the LPIA. (C) 2015 Published by Elsevier B.V.en
dc.description.affiliationUniv Fed Parana, Dept Geol, BR-81531980 Curitiba, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Geol Aplicada, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniv Fed Rio Grande do Sul, Inst Geociencias, Dept Paleontol & Estratig, BR-91501970 Porto Alegre, RS, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Geol Aplicada, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCNPq: 305108/2009-3
dc.description.sponsorshipIdCNPq: 401769/2010-0
dc.description.sponsorshipIdCNPq: 461650/2014-2
dc.description.sponsorshipIdCNPq: 461628/2014-7
dc.description.sponsorshipIdFAPESP: 98/02183-3
dc.format.extent45-63
dc.identifierhttp://dx.doi.org/10.1016/j.sedgeo.2015.06.012
dc.identifier.citationSedimentary Geology. Amsterdam: Elsevier Science Bv, v. 326, p. 45-63, 2015.
dc.identifier.doi10.1016/j.sedgeo.2015.06.012
dc.identifier.fileWOS000360252500004.pdf
dc.identifier.issn0037-0738
dc.identifier.lattes0471102133658128
dc.identifier.lattes0471102133658128
dc.identifier.urihttp://hdl.handle.net/11449/160747
dc.identifier.wosWOS:000360252500004
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofSedimentary Geology
dc.relation.ispartofsjr1,277
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectLate Paleozoic Ice Age
dc.subjectGlacial record
dc.subjectIce marginal
dc.subjectDeglaciation
dc.subjectItarare Group
dc.titleSedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazilen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes0471102133658128

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