- Tytuł:
- 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 - Powiązania:
- https://bibliotekanauki.pl/articles/94597.pdf
- Data publikacji:
- 2009
- Wydawca:
- Uniwersytet im. Adama Mickiewicza w Poznaniu
- Tematy:
-
NE Brazil
Cretaceous-Paleogene boundary
carbon isotopes
oxygen isotopes
Brazylia
izotop węgla
izotop tlenu - Opis:
- 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.
- Źródło:
-
Geologos; 2009, 15, 2; 103-113
1426-8981
2080-6574 - Pojawia się w:
- Geologos
- Dostawca treści:
- Biblioteka Nauki
Artykuł