Sedimentary development and isotope analysis of deposits at the Cretaceous/Palaeogene transition in the Paraíba Basin, NE Brazil

dc.contributor.authorNeumann, Virgínio Henrique
dc.contributor.authorBarbosa, José Antônio
dc.contributor.authorSilva, Maria Valberlândia Nascimento
dc.contributor.authorFilho, Mário de Lima
dc.date.accessioned2010-02-24T13:40:01Z
dc.date.available2010-02-24T13:40:01Z
dc.date.issued2009
dc.description.abstractNew data are presented for three formations (Itamaracá, Gramame and Maria Farinha) and two boundaries (Campanian/Maastrichtian and Maastrichtian/Danian) in the Olinda Sub-basin of the Paraíba Basin. Currently accepted facies models, sequence stratigraphy characterizations, and stable-isotope data of carbon and oxygen are reviewed. The carbonate cement of the Itamaracá Formation sandstones shows carbon- and oxygen-isotope ratios consistent with a shallow-marine depositional environment: δ18O ranges from -0.8 to -2.7‰ PDB, and δ13C ranges from +1 to +2‰ PDB. Within the Itamaracá Formation, a maximum flooding surface at the Campanian/Maastrichtian transition has been identified. During the Maastrichtian, a Highstand System Tract was deposited, which shows an increase in temperature and marine bioproductivity as recorded by stable-isotope values (δ18O from -3 to -5‰ PDB, and δ13C values of -1.2, -0.3, 0.1 and +2.3‰ PDB). Just below the K/Pg boundary, the O-isotope signal indicates three warming phases, alternating with four cooling phases.pl_PL
dc.identifier.citationGeologos vol. 15 (2), 2009, pp. 103-113.pl_PL
dc.identifier.issn1426-8981
dc.identifier.urihttp://hdl.handle.net/10593/160
dc.publisherBogucki Wydawnictwo Naukowepl_PL
dc.subjectNE Brazilpl_PL
dc.subjectCretaceous/Palaeogene boundarypl_PL
dc.subjectcarbon isotopespl_PL
dc.subjectoxygen isotopespl_PL
dc.titleSedimentary development and isotope analysis of deposits at the Cretaceous/Palaeogene transition in the Paraíba Basin, NE Brazilpl_PL
dc.typeArtykułpl_PL

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