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dc.contributor.authorVesely, Fernando F.
dc.contributor.authorAssine, Mario L. [UNESP]
dc.date.accessioned2014-12-03T13:08:56Z
dc.date.available2014-12-03T13:08:56Z
dc.date.issued2014-01-01
dc.identifierhttp://dx.doi.org/10.2110/jsr.2014.4
dc.identifier.citationJournal Of Sedimentary Research. Tulsa: Sepm-soc Sedimentary Geology, v. 84, n. 1-2, p. 26-39, 2014.
dc.identifier.issn1527-1404
dc.identifier.urihttp://hdl.handle.net/11449/111735
dc.description.abstractSoft-sediment glacially striated surfaces are common structures in ancient glacial successions, such as the Gondwanic Paleozoic record, and document ice erosion on non lithified beds. In most cases, they have been interpreted as the product of subglacial erosion beneath advancing marine or terrestrial glaciers, although direct evidence for glacial sedimentation in associated strata is infrequent. In this paper we document soft-sediment striated surfaces of Carboniferous age occurring in cross-laminated sandstones of the lower Itarare Group, southern Parana Basin, Brazil, and interpret them as scour marks generated by keels of floating ice. Striated surfaces occur in closely spaced, multiple stratigraphic horizons in the lower half of a deglacial sequence, whose fades characteristics indicate sedimentation in subaqueous outwash and deltaic settings. Surfaces are laterally discontinuous, commonly bordered by marginal berms, and in some cases capped by mudstones with dropstones; they have orientations that deviate from the regional paleo-ice flow indicated by glacial grooves carved on the pre-glacial basement. The characteristics observed are consistent with modern and Pleistocene ice-keel scour marks. In addition, soft-sediment striated surfaces from other Gondwanic localities have similar attributes, suggesting that ice-keel scour marks may be more common in the geological record than previously considered and that vertically repeated striated surfaces do not necessarily indicate multiple ice-sheet advances. Therefore, paleo-ice flow reconstructions based on soft-sediment striated surfaces need to be revaluated considering that the movement of free-floating ice masses is controlled by phenomena other than glacier advance.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.extent26-39
dc.language.isoeng
dc.publisherSepm-soc Sedimentary Geology
dc.relation.ispartofJournal Of Sedimentary Research
dc.sourceWeb of Science
dc.titleICE-KEEL SCOUR MARKS IN THE GEOLOGICAL RECORD: EVIDENCE FROM CARBONIFEROUS SOFT-SEDIMENT STRIATED SURFACES IN THE PARANA BASIN, SOUTHERN BRAZILen
dc.typeArtigo
dcterms.rightsHolderSepm-soc Sedimentary Geology
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.description.affiliationUFPR Univ Fed Parana, Ctr Politecn, Dept Geol, BR-81531990 Curitiba, Parana, Brazil
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP, Brazil
dc.identifier.doi10.2110/jsr.2014.4
dc.identifier.wosWOS:000336510800003
dc.rights.accessRightsAcesso restrito
dc.description.sponsorshipIdFAPESP: 98/02183-3
dc.description.sponsorshipIdCNPq: 305108/2009-3
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt
unesp.author.orcid0000-0002-3097-5832[2]
dc.relation.ispartofjcr2.358
dc.relation.ispartofsjr1,347
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