Geobiological and diagenetic insights from Malvinokaffric Devonian biota (Chapada group, Paraná Basin, Brazil): Paleobiological and paleoenvironmental implications

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dc.contributor.authorBecker-Kerber B.
dc.contributor.authorLadeiraoses G.
dc.contributor.authorCurado J.F.
dc.contributor.authorDe Almeida Rizzutto M.
dc.contributor.authorRudnitzki I.D.
dc.contributor.authorRomero G.R.
dc.contributor.authorOnary-Alves S.Y.
dc.contributor.authorBenini V.G.
dc.contributor.authorGalante D.
dc.contributor.authorRodrigues F.
dc.contributor.authorBuck P.V.
dc.contributor.authorRangel E.C.
dc.contributor.authorGhilardi R.P.
dc.contributor.authorPacheco M.L.A.F.
dc.date.accessioned2019-08-19T23:47:14Z
dc.date.available2019-08-19T23:47:14Z
dc.date.issued2017
dc.description.abstract© 2017, SEPM (Society for Sedimentary Geology).This study tests the presence of differential preservation in the Devonian Malvinokaffric fauna from the Chapada Group (Paraná Basin, Brazil). Results of EDXRF, EDS, Raman Spectroscopy, and petrographic analyses show differential preservation of shells that were originally calcite as hematite and goethite fossils, while organisms with original calcium phosphate shells tend to be preserved inside phosphatic concretions. Both preservation types are commonly associated with pseudoframboids, while calcium sulfate minerals are commonly associated with hematized fossils. From this evidence, a diagenetic model for these fossils is proposed. The model includes an early diagenetic phase (characterized by anaerobic sulfate reduction and precipitation of pyrite and carbonate-fluorapatite) and a second, near-surface chemical weathering phase (characterized by the oxidation of pyrite and precipitation of iron oxyhydroxides and calcium sulfates). Acidic conditions in both phases may account for the dissolution of less stable minerals compared to calcium phosphate. It is considered that this model may assist in understanding other similarly preserved biotas, as well as enhancing understanding of the taphonomic overprint that may occur within this important and endemic Devonian biota.
dc.description.firstpage238
dc.description.issuenumber4
dc.description.lastpage249
dc.description.volume32
dc.identifier.citationBECKER-KERBER, BRUNO; RODRIGUES, FABIO; BUCK, PEDRO VICTOR; RANGEL, ELIDIANE CIPRIANO; GHILARDI, RENATO PIRANI; PACHECO, MÍRIAN LIZA ALVES FORANCELLI; OSÉS, GABRIEL LADEIRA; CURADO, JESSICA FLEURY; DE ALMEIDA RIZZUTTO, MÁRCIA; RUDNITZKI, ISAAC DANIEL; ROMERO, GUILHERME RAFFAELI; ONARY-ALVES, SILVIO YUJI; BENINI, VICTORIA GIOPATO; GALANTE, DOUGLAS. GEOBIOLOGICAL AND DIAGENETIC INSIGHTS FROM MALVINOKAFFRIC DEVONIAN BIOTA (CHAPADA GROUP, PARANÁ BASIN, BRAZIL): PALEOBIOLOGICAL AND PALEOENVIRONMENTAL IMPLICATIONS. PALAIOS, v. 32, n. 4, p. 238-249, 2017.
dc.identifier.doi10.2110/palo.2016.082
dc.identifier.issn0883-1351
dc.identifier.urihttps://repositorio.fei.edu.br/handle/FEI/1396
dc.relation.ispartofPalaios
dc.rightsAcesso Restrito
dc.titleGeobiological and diagenetic insights from Malvinokaffric Devonian biota (Chapada group, Paraná Basin, Brazil): Paleobiological and paleoenvironmental implications
dc.typeArtigo
fei.scopus.citations7
fei.scopus.eid2-s2.0-85022012574
fei.scopus.updated2024-03-04
fei.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85022012574&origin=inward
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