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Marine Reservoir Corrections for the Brazilian Northern Coast Using Modern Corals

Published online by Cambridge University Press:  13 March 2019

Maria Isabela Oliveira
Affiliation:
Laboratório de Radiocarbono (LAC-UFF), Instituto de Física, Universidade Federal Fluminense (UFF), Av. Gal. Milton Tavares de Souza, Niterói, 24210-346, Rio de Janeiro, Brazil
Carla Carvalho*
Affiliation:
Laboratório de Radiocarbono (LAC-UFF), Instituto de Física, Universidade Federal Fluminense (UFF), Av. Gal. Milton Tavares de Souza, Niterói, 24210-346, Rio de Janeiro, Brazil Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense (UFF), Outeiro São João Batista, Niterói, 24210-141, Rio de Janeiro, Brazil
Kita Macario
Affiliation:
Laboratório de Radiocarbono (LAC-UFF), Instituto de Física, Universidade Federal Fluminense (UFF), Av. Gal. Milton Tavares de Souza, Niterói, 24210-346, Rio de Janeiro, Brazil Departamento de Física, Universidade Federal Fluminense (UFF), Niterói, Rio de Janeiro, Brazil
Heitor Evangelista
Affiliation:
LARAMG – Laboratório de Radioecologia e Mudanças Globais. Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, Brazil
Saulo Lamounier
Affiliation:
LARAMG – Laboratório de Radioecologia e Mudanças Globais. Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, Brazil
Izabela Hammerschlag
Affiliation:
Laboratório de Radiocarbono (LAC-UFF), Instituto de Física, Universidade Federal Fluminense (UFF), Av. Gal. Milton Tavares de Souza, Niterói, 24210-346, Rio de Janeiro, Brazil Departamento de Física, Universidade Federal Fluminense (UFF), Niterói, Rio de Janeiro, Brazil
*
*Corresponding author. Email: carlac@id.uff.br.

Abstract

The Abrolhos bank, in southern Bahia State (BA), is the largest coral reef system in the southwestern Atlantic. It is highly influenced by the Brazil Current (BC), since it is located in the continental shelf. By contrast, Todos os Santos Bay (TSB), in Salvador, capital of Bahia State (BA) has an important coral biodiversity, located in a bay inlet with restricted water circulation. Coral cores were collected in those sites and were analyzed for density band counting and by Th/U dating to estimate growth rates and age. In this work, we present 14C ages of some of these bands in order to evaluate the marine reservoir effect (MRE) to which the colonies were subjected during growth. It is the first study making use of coral skeleton samples for MRE determination for the Brazilian coast. ΔR was calculated to be –151±23 14C yr, while that for the TSB was –107±51 14C yr.

Type
Research Article
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

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