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

• Autorzy: Neumann Virgínio Henrique , Barbosa José Antônio , Nascimento-Silva Valberlândia Maria , Sial Alcides Nobrega , Filho Mario
• Języki publikacji: EN

Abstrakty

EN

New 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.

Słowa kluczowe

EN

NE Brazil; Cretaceous-Paleogene boundary; carbon isotopes; oxygen isotopes

PL

Brazylia; izotop węgla; izotop tlenu

• Wydawca: Uniwersytet im. Adama Mickiewicza. Instytut Geologii
• Czasopismo: Geologos
• Rocznik: 2009
• Tom: Vol. 15, No. 2
• Strony: 103--113
• Opis fizyczny: Bibliogr. 32 poz.

Twórcy

autor

Neumann Virgínio Henrique

• LAGESE, Department of Geology, Federal University of Pernambuco, Rua Acadêmico Hélio Ramos, s/n, 5 andar CTG, Cidade Universitária, Recife-PE, Brasil

autor

Barbosa José Antônio

autor

Nascimento-Silva Valberlândia Maria

autor

Sial Alcides Nobrega

autor

Filho Mario

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).