Efeito de reservatório marinho na costa do Brasil

Autori

DOI:

https://doi.org/10.5380/abequa.v9i1.53210

Parole chiave:

radiocarbono, calibração, amostras marinhas, datação

Abstract

Em estudos cronológicos de processos ocorridos nos últimos 50 mil anos, a datação de carbono 14 é a abordagem mais utilizada em todo o mundo. Para permitir a correta interpretação das idades obtidas, faz-se necessária a calibração dos resultados com base em um robusto banco de dados produzido pela comunidade científica na área de radiocarbono. A calibração objetiva, principalmente, considerar as variações na produção e distribuição do 14C ao longo do tempo e, no caso do ambiente marinho, corrigir ainda que parcialmente o Efeito de Reservatório Marinho (Marine Reservoir Effect – MRE). De fato, dado que a magnitude do fenômeno aumenta com a profundidade e varia espacialmente em função da dinâmica oceânica, a simples calibração com uma curva marinha global é incapaz de lidar com a real variabilidade do efeito, rendendo resultados não acurados. Desse modo, considera-se também uma
correção local, denominada ΔR, com valores disponíveis na literatura para diversas regiões do globo. Assim, no procedimento que é atualmente o padrão adotado em estudos cronológicos, a correção local para o MRE antecede a calibração de uma idade de 14C marinha com a curva global. Aqui objetivamos
elencar os valores de ΔR disponíveis para a costa brasileira, mostrando o impacto causado na calibração das idades de radiocarbono e a importância desse tipo de correção para estudos cronológicos baseados na datação de 14C de material marinho. Discutimos, finalmente, os problemas causados pela falta ou
pelo uso equivocado dessa correção

Biografie autore

Kita Macario, Universidade Federal Fluminense

Departamento de Física

Laboratório de Radiocarbono

Eduardo Queiroz Alves, University of Oxford

Oxford Radiocarbon Accelerator Unit

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Pubblicato

2018-02-01

Come citare

Macario, K., & Alves, E. Q. (2018). Efeito de reservatório marinho na costa do Brasil. Quaternary and Environmental Geosciences, 9(1). https://doi.org/10.5380/abequa.v9i1.53210

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Artigo de Revisão e Atualização