The interplay between event and background sedimentation and the origin of fossil-rich carbonate concretions: a case study in Permian rocks of the Paraná Basin, Brazil

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dc.contributor.authorBondioli, João Guedes
dc.contributor.authorMatos, Suzana Alves
dc.contributor.authorWarren, Lucas Verissimo [UNESP]
dc.contributor.authorAssine, Mário Luis [UNESP]
dc.contributor.authorRiccomini, Cláudio
dc.contributor.authorSimões, Marcello Guimarães [UNESP]
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2016-07-07T12:35:42Z
dc.date.available2016-07-07T12:35:42Z
dc.date.issued2015
dc.description.abstractThe Permian Serra Alta Formation was generated under transgressive conditionswithin a large, calm epeiric sea. A monotonous succession of ‘barren’, massive mud-stones deposited under oxygen-deficient conditions (mainly below storm wave base)is the main lithofacies of this unit. Fossils are generally rare and diluted in the matrix,but certain intervals contain shell-rich concentrations with well-preserved, closedarticulated bivalves, mixed with shells and comminuted debris with variable quality ofpreservation, all encased in carbonate concretions. Two main scenarios may accountfor the origin of these bivalve-rich concretions (i.e. unique events in sea-water chemis-try or unique burial-starvation couplets). Sedimentological and taphonomic informa-tion indicates that the final deposition of the original shell-rich mudstone intervalswas probably tied to episodic influx of fine-grained sediments in distal settings. Mod-erate bioturbation is also recorded suggesting low rates of sedimentation prior to earlydiagenesis. Hence, the fossil concentrations in concretions were formed due to theinterplay of event and background sedimentation. These are internally simple concen-trations with complex depositional histories. The concretion-bearing beds are not ran-domly distributed in the Serra Alta Formation. Rather, they are found in the sparselyfossiliferous offshore deposits of the basal to intermediate portions of the unit. Thus,the concretionary mudstone beds and associated deposits are preserved in particularintervals and can be tracked for kilometres. This indicates that the conditions essentialfor concretion development existed only at particular stratigraphical intervals. Finally,our study strongly corroborates the idea that concretions are critical sources of sedi-mentological, taphonomic and stratigraphical information.en
dc.description.affiliationUnespUniversidade Estadual Paulista, Departamento de Geologia Aplicada, Instituto de Geociências e Ciências Exatas de Rio Claro
dc.description.affiliationUnespUniversidade Estadual Paulista, Departamento de Zoologia, Instituto de Biociências de Botucatu
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.extent522-539
dc.identifierhttp://dx.doi.org/10.1111/let.12124
dc.identifier.citationLethaia, v. 48, n. 4, p. 522-539, 2015.
dc.identifier.doi10.1111/let.12124
dc.identifier.issn0024-1164
dc.identifier.lattes471102133658128
dc.identifier.lattes1333845337012256
dc.identifier.lattes3952163015625103
dc.identifier.lattes0471102133658128
dc.identifier.urihttp://hdl.handle.net/11449/140849
dc.language.isoeng
dc.relation.ispartofLethaia
dc.relation.ispartofjcr2.218
dc.relation.ispartofsjr0,873
dc.rights.accessRightsAcesso restrito
dc.sourceCurrículo Lattes
dc.subjectBiostratinomyen
dc.subjectBivalvesen
dc.subjectCarbonate concretionsen
dc.subjectFossil diagenesisen
dc.subjectPermianen
dc.titleThe interplay between event and background sedimentation and the origin of fossil-rich carbonate concretions: a case study in Permian rocks of the Paraná Basin, Brazilen
dc.typeArtigo
unesp.author.lattes471102133658128
unesp.author.lattes1333845337012256
unesp.author.lattes3952163015625103
unesp.author.lattes0471102133658128
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt
unesp.departmentGeologia Aplicadapt
unesp.departmentZoologiapt

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Artigos - Geologia Aplicada - IGCE
Artigos - Zoologia - IBB