Use este identificador para citar ou linkar para este item:
http://www.repositorio.ufop.br/jspui/handle/123456789/8862
Título: | Geobiological and diagenetic insights from Malvinokaffric devonian biota (Chapada Group, Paraná Basin, Brazil) : paleobiological and paleoenvironmental implications. |
Autor(es): | Kerber, Bruno Becker Osés, Gabriel Ladeira Curado, Jessica Fleury Rizzutto, Márcia de Almeida Rudnitzki, Isaac Daniel Romero, Guilherme Raffaeli Alves, Silvio Yuji Onary Benini, Victoria Giopato Galante, Douglas Rodrigues, Fabio Buck, Pedro Victor Rangel, Elidiane Cipriano Ghilardi, Renato Pirani Pacheco, Mírian Liza Alves Forancelli |
Data do documento: | 2017 |
Referência: | KERBER, 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. |
Resumo: | This 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. |
URI: | http://www.repositorio.ufop.br/handle/123456789/8862 |
Link para o artigo: | http://palaios.geoscienceworld.org/content/32/4/238 |
DOI: | https://doi.org/10.2110/palo.2016.082 |
ISSN: | 1938-5323 |
Aparece nas coleções: | DEGEO - Artigos publicados em periódicos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
---|---|---|---|---|
ARTIGO_GeobiologicalDiageneticInsights.pdf Restricted Access | 7,08 MB | Adobe PDF | Visualizar/Abrir |
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.