Brasil | Artigo

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

dc.contributorUniversidade de São Paulo (USP)
dc.contributorUniversidade Estadual Paulista (Unesp)
dc.creatorBondioli, João Guedes
dc.creatorMatos, Suzana Alves
dc.creatorWarren, Lucas Verissimo [UNESP]
dc.creatorAssine, Mário Luis [UNESP]
dc.creatorRiccomini, Cláudio
dc.creatorSimões, Marcello Guimarães [UNESP]
dc.date2016-07-07T12:35:42Z
dc.date2016-07-07T12:35:42Z
dc.date2015
dc.date.accessioned2023-09-12T10:19:38Z
dc.date.available2023-09-12T10:19:38Z
dc.identifierhttp://dx.doi.org/10.1111/let.12124
dc.identifierLethaia, v. 48, n. 4, p. 522-539, 2015.
dc.identifier0024-1164
dc.identifierhttp://hdl.handle.net/11449/140849
dc.identifier10.1111/let.12124
dc.identifier471102133658128
dc.identifier1333845337012256
dc.identifier3952163015625103
dc.identifier0471102133658128
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8790053
dc.descriptionThe 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.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionUniversidade Estadual Paulista, Departamento de Geologia Aplicada, Instituto de Geociências e Ciências Exatas de Rio Claro
dc.descriptionUniversidade Estadual Paulista, Departamento de Zoologia, Instituto de Biociências de Botucatu
dc.format522-539
dc.languageeng
dc.relationLethaia
dc.relation2.218
dc.relation0,873
dc.rightsAcesso restrito
dc.sourceCurrículo Lattes
dc.subjectBiostratinomy
dc.subjectBivalves
dc.subjectCarbonate concretions
dc.subjectFossil diagenesis
dc.subjectPermian
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, Brazil
dc.typeArtigo


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