Isótopos estáveis de carbono e oxigênio em ostracodes do Cretáceo: metodologias, aplicações e desafios

  • Gislaine Bertoglio Rodrigues Universidade do Vale dos Sinos
  • Gerson Fauth Universidade do Vale dos Sinos
Palavras-chave: Análises isotópicas. Ostracodes. Paleoprodutividade. Paleotemperatura. Cretáceo.

Resumo

Ostracodes são microfósseis carbonáticos que têm se destacado na pesquisa de isótopos estáveis devido à rápida calcificação da carapaça, sua elevada sensibilidade aos parâmetros ambientais e à sua ocorrência em diferentes ambientes aquáticos. Os isótopos de carbono proporcionam informações sobre paleoprodutividade e disponibilidade de nutrientes dos oceanos e lagos. Os isótopos de oxigênio são utilizados para estimar a paleotemperatura e a paleosalinidade vigentes em determinada bacia sedimentar ao longo do tempo geológico. Até o momento, as análises isotópicas em carapaças de ostracodes são realizadas principalmente em material do Cenozoico, com poucas pesquisas realizadas para o Mesozoico. Esta técnica é amplamente utilizada em ostracodes de ambientes não-marinhos, sendo realizada com cautela em ambientes transicionais e marinhos, onde a composição da carapaça será semelhante à da rocha carbonática que o contém. Este texto compreende conceitos de isótopos estáveis, da técnica analítica utilizada, da realização das análises em ostracodes e da interpretação dos resultados nos estudos paleoambientais, e propõe um protocolo de pesquisa considerando as dificuldades de amostragem e de aplicação em carapaças do Cretáceo.

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Biografia do Autor

Gislaine Bertoglio Rodrigues, Universidade do Vale dos Sinos
PPGEO FOSSIL, Univ. do Vale do Rio dos Sinos São Leopoldo-RS, Brasil.
Gerson Fauth, Universidade do Vale dos Sinos

ITT FOSSIL, Univ. do Vale do Rio dos Sinos São Leopoldo-RS, Brasil.

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Publicado
2015-06-25
Como Citar
Rodrigues, G. B., & Fauth, G. (2015). Isótopos estáveis de carbono e oxigênio em ostracodes do Cretáceo: metodologias, aplicações e desafios. Terrae Didatica, 9(1), 34-49. https://doi.org/10.20396/td.v9i1.8637408
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