Geobiological and diagenetic insights from Malvinokaffric devonian biota (Chapada Group, Paraná Basin, Brazil) : paleobiological and paleoenvironmental implications.

dc.contributor.authorKerber, Bruno Becker
dc.contributor.authorOsés, Gabriel Ladeira
dc.contributor.authorCurado, Jessica Fleury
dc.contributor.authorRizzutto, Márcia de Almeida
dc.contributor.authorRudnitzki, Isaac Daniel
dc.contributor.authorRomero, Guilherme Raffaeli
dc.contributor.authorAlves, Silvio Yuji Onary
dc.contributor.authorBenini, Victoria Giopato
dc.contributor.authorGalante, Douglas
dc.contributor.authorRodrigues, Fabio
dc.contributor.authorBuck, Pedro Victor
dc.contributor.authorRangel, Elidiane Cipriano
dc.contributor.authorGhilardi, Renato Pirani
dc.contributor.authorPacheco, Mírian Liza Alves Forancelli
dc.date.accessioned2017-10-04T12:12:28Z
dc.date.available2017-10-04T12:12:28Z
dc.date.issued2017
dc.description.abstractThis study tests the presence of differential preservation in the Devonian Malvinokaffric fauna from the Chapada Group (Parana´ 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.pt_BR
dc.identifier.citationKERBER, B. B. et al. Geobiological and diagenetic insights from Malvinokaffric devonian biota (Chapada Group, Paraná Basin, Brazil): paleobiological and paleoenvironmental implications. Palaios, Tulsa, v. 32, p. 238-249, 2017. Disponível em: <http://palaios.geoscienceworld.org/content/32/4/238>. Acesso em: 25 ago. 2017.pt_BR
dc.identifier.doihttps://doi.org/10.2110/palo.2016.082
dc.identifier.issn1938-5323
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/8862
dc.identifier.uri2http://palaios.geoscienceworld.org/content/32/4/238pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.titleGeobiological and diagenetic insights from Malvinokaffric devonian biota (Chapada Group, Paraná Basin, Brazil) : paleobiological and paleoenvironmental implications.pt_BR
dc.typeArtigo publicado em periodicopt_BR

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