Untold muddy tales: Paleoenvironmental dynamics of a barren mudrock succession from a shallow Permian epeiric sea

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dc.contributor.authorSimoes, M. G. [UNESP]
dc.contributor.authorMatos, S. A.
dc.contributor.authorWarren, L. V. [UNESP]
dc.contributor.authorAssine, M. L. [UNESP]
dc.contributor.authorRiccomini, C.
dc.contributor.authorBondioli, J. G.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-26T17:06:40Z
dc.date.available2018-11-26T17:06:40Z
dc.date.issued2016-11-01
dc.description.abstractDuring the late Paleozoic, the intracratonic Parana Basin, Brazil, in central Gondwanaland, was covered by a huge (>1.600.000 km(2)), shallow and isolated epeiric sea. Within the Permian succession, oxygen deficient fades are commonly recorded in the Mesosaurus-bearing Irati Formation (Cisuralian, Artinskian/Kungurian) and the overlaying Serra Alta Formation (Guadalupian, Wordian/Capitanian). Barren, dark-grey mudstones are the main facies preserved in this last unit, which has usually discouraged extensive and detailed stratigraphical and paleontological investigations. However, exhaustive sedimentological, taphonomic and paleontological surveys in those deposits reveal a dynamic and complex depositonal history. Based on sedimentary fabric, autochthonous to parautochthonous occurrences of shelly benthic invertebrates (bivalves) and the presence/absence of concretion-bearing and phosphate rich layers, we report variations in the oxygen levels of bottom and pore waters, in bathymetry, sedimentation rates, and changes in benthic colonization. Our data indicate that the deposition of this apparently barren mudstone-dominated succession was driven by a complex interplay of variations in sedimentation rate and oxygen pulses tied to tectonic and climate changes. Three distinct populations or invertebrate paleocommunities were recorded, which were adapted to (a) normal background lowoxygerr (dysoxic) conditions (i.e., minute infaunal suspension-feeding bivalves associated with the trace fossil Planolites), (b) chemically toxic (anoxic/extreme dysoxic) substrates, including gigantic burrowing bivalves (probable chemosymbiotic taxa), and (c) oxic/dysoxic substrates following short-term bottom disruptions. (C) 2016 Elsevier Ltd. All rights reserved.en
dc.description.affiliationUniv Estadual Paulista, Dept Zool, Inst Biociencias, Postal Code 510, BR-18618970 Botucatu, SP, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Geociencias, Programa Posgrad Geoquim & Geotecton, BR-05508080 Sao Paulo, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Campus Rio Claro,Postal Code 178, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Energia & Ambiente, Sao Paulo, SP, Brazil
dc.description.affiliationUniv Sao Paulo, Inst Geociencias, Sao Paulo, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Zool, Inst Biociencias, Postal Code 510, BR-18618970 Botucatu, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Geol Aplicada, Inst Geociencias & Ciencias Exatas, Campus Rio Claro,Postal Code 178, BR-13506900 Rio Claro, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdFAPESP: 2012/12508-6
dc.description.sponsorshipIdCNPq: 302903/2012-7
dc.description.sponsorshipIdCNPq: 303020/2015-6
dc.description.sponsorshipIdCNPq: 444070/2014-1
dc.format.extent223-234
dc.identifierhttp://dx.doi.org/10.1016/j.jsames.2016.08.002
dc.identifier.citationJournal Of South American Earth Sciences. Oxford: Pergamon-elsevier Science Ltd, v. 71, p. 223-234, 2016.
dc.identifier.doi10.1016/j.jsames.2016.08.002
dc.identifier.fileWOS000385322400016.pdf
dc.identifier.issn0895-9811
dc.identifier.urihttp://hdl.handle.net/11449/162052
dc.identifier.wosWOS:000385322400016
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of South American Earth Sciences
dc.relation.ispartofsjr0,829
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectBenthic paleocommunities
dc.subjectChemosymbionts
dc.subjectExaerobic to dysaerobic substrates
dc.titleUntold muddy tales: Paleoenvironmental dynamics of a barren mudrock succession from a shallow Permian epeiric seaen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
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Artigos - Zoologia - IBB
Artigos - Geologia Aplicada - IGCE