The rise and fall of the giant stromatolites of the Lower Permian Irati Formation (Paraná Basin, Brazil): A multi-proxy based paleoenvironmental reconstruction

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dc.contributor.authorAntunes, G. C. [UNESP]
dc.contributor.authorWarren, L. V. [UNESP]
dc.contributor.authorOkubo, J. [UNESP]
dc.contributor.authorFairchild, T. R.
dc.contributor.authorVarejão, F. G.
dc.contributor.authorUhlein, G. J.
dc.contributor.authorInglez, L. [UNESP]
dc.contributor.authorPoiré, D. G.
dc.contributor.authorBahniuk, A. M.
dc.contributor.authorSimões, M. G. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionFederal University of Ouro Preto (UFOP)
dc.contributor.institutionUniversidade Federal de Minas Gerais (UFMG)
dc.contributor.institutionUNLP-CONICET
dc.contributor.institutionUniversidade Federal do Paraná (UFPR)
dc.date.accessioned2023-07-29T13:23:44Z
dc.date.available2023-07-29T13:23:44Z
dc.date.issued2022-11-15
dc.description.abstractGiant stromatolites are meter-scale laminated carbonate biosedimentary deposits formed by the action of benthic microbiota under very specific conditions. Although occurrences of giant stromatolites are relatively common in Precambrian deposits, the Phanerozoic record is still sparse. Here, we carried out an integrated analysis of the Lower Permian Santa Rosa de Viterbo giant stromatolite field, developed in a mixed carbonate-siliciclastic depositional system within a restricted intracontinental basin (Irati Formation, Paraná Basin, Brazil). Using available and new descriptions of stromatolite morphology and associated facies, we applied a multi-proxy approach based upon sedimentological, paleontological, geochemical, and isotopic data to develop a detailed paleoenvironmental model for this particular occurrence. The NE-SW elongated giant stromatolites – of >3 m in height, > 7 m in length, and > 1 m wide – have variable external shape and internal morphology, indicating changing growth strategy due to variations in the hydrodynamic conditions, bathymetry, and terrigenous input. Increasing δ13C values towards the top of the succession are related to intense microbial activity, increased nutrient supply, and enhanced primary productivity, with the higher δ13C values matching the global Permian seawater signal. Y/Ho and La/La* ratios indicate a less restricted setting towards the top of the succession, which is consistent with the increasing water depth recorded by the stromatolite morphology. The combination of smooth lamination, exclusively coccoidal microbial community, and fossil content, point to deposition under high (possibly hyper) salinity conditions for most of the succession. Our data suggests that the existence of stressful conditions (i.e., strong currents and high salinity) protected the benthic microbial communities from predation and favored EPS production, generating the ideal conditions for the growth of giant stromatolites, a very uncommon situation in the Phanerozoic.en
dc.description.affiliationDepartment of Geology São Paulo State University (UNESP), Bela Vista, SP
dc.description.affiliationInstitute of Geosciences São Paulo University (USP), Butantã, SP
dc.description.affiliationDepartment of Geology School of Mines Federal University of Ouro Preto (UFOP), Morro do Cruzeiro, MG
dc.description.affiliationManoel Teixeira da Costa Research Center Institute of Geosciences Department of Geology Federal University of Minas Gerais (UFMG), Pampulha, MG
dc.description.affiliationCentro de Investigaciones Geológicas UNLP-CONICET, calle 1, n. 644
dc.description.affiliationLAMIR Institute Department of Geology Federal University of Paraná (UFPR), Jardim das Américas, PR
dc.description.affiliationDepartment of Zoology São Paulo State University (UNESP), Rubião Júnior District, SP
dc.description.affiliationUnespDepartment of Geology São Paulo State University (UNESP), Bela Vista, SP
dc.description.affiliationUnespDepartment of Zoology São Paulo State University (UNESP), Rubião Júnior District, SP
dc.description.sponsorshipFinanciadora de Estudos e Projetos
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2019/00515-7
dc.identifierhttp://dx.doi.org/10.1016/j.palaeo.2022.111246
dc.identifier.citationPalaeogeography, Palaeoclimatology, Palaeoecology, v. 606.
dc.identifier.doi10.1016/j.palaeo.2022.111246
dc.identifier.issn0031-0182
dc.identifier.scopus2-s2.0-85139287952
dc.identifier.urihttp://hdl.handle.net/11449/247709
dc.language.isoeng
dc.relation.ispartofPalaeogeography, Palaeoclimatology, Palaeoecology
dc.sourceScopus
dc.subjectCarbonate geochemistry
dc.subjectGiant microbialites
dc.subjectIrati-Whitehill Sea
dc.subjectRestricted basin
dc.subjectStressful environment
dc.subjectStromatolite growth
dc.titleThe rise and fall of the giant stromatolites of the Lower Permian Irati Formation (Paraná Basin, Brazil): A multi-proxy based paleoenvironmental reconstructionen
dc.typeArtigo

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