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Aragonite Fraction Dating of Vermetids in the Context of Paleo Sea-Level Curves Reconstruction

Published online by Cambridge University Press:  14 February 2020

Vinicius N Moreira ,
Kita D Macario Open the ORCID record for Kita D Macario [Opens in a new window] ,
Renato B Guimarães ,
Fábio F Dias ,
Julia C Araujo ,
Perla Jesus  and
Katerina Douka
Vinicius N Moreira
Affiliation:
Laboratório de Radiocarbono, Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, 24210-346, Niterói, RJ, Brazil
Kita D Macario*
Affiliation:
Laboratório de Radiocarbono, Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, 24210-346, Niterói, RJ, Brazil Programa de Pós-graduação em Biologia Marinha e Ambientes Costeiros, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói, 24001-970, RJ, Brazil
Renato B Guimarães
Affiliation:
Laboratório de Difração de Raios X, Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, 24210-346, Niterói, RJ, Brazil
Fábio F Dias
Affiliation:
Programa de Pós-graduação em Biologia Marinha e Ambientes Costeiros, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói, 24001-970, RJ, Brazil
Julia C Araujo
Affiliation:
Programa de Pós-graduação em Biologia Marinha e Ambientes Costeiros, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói, 24001-970, RJ, Brazil
Perla Jesus
Affiliation:
Programa de Pós-graduação em Biologia Marinha e Ambientes Costeiros, Universidade Federal Fluminense, Outeiro São João Batista, s/n, Niterói, 24001-970, RJ, Brazil
Katerina Douka
Affiliation:
Oxford Radiocarbon Unit (ORAU), Dyson Perrins Building, South Parks Road, OxfordOX1 3QY, United Kingdom Max Planck Institute for the Science of Human History, Kahlaische Str. 10, 07745, Jena, Germany
*
*Corresponding author. Email: kitamacario@gmail.com
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Abstract

Identifying and tackling recrystallization is a critical factor in the reliable radiocarbon (14C) dating of carbonates, since exogenous carbon can be incorporated and thus mask the real age of the samples. Vermetids are among the most important bioindicators used for paleo sea-level reconstruction, and the accuracy of their chronology can significantly impact sea-level curves. Age differences larger than 1 14C kyr before and after acid etching, combined with X-ray diffraction (XRD) analysis that indicates a significant amount of calcite still remains in the shell, led us to apply the previously developed carbonate density separation protocol (CarDS). Using a solution of sodium polytungstate, with density of 2.80 g/cm3, we successfully separated different carbonate fractions for a set of 10 vermetid samples from the coast of Rio de Janeiro, southeast of Brazil. Each separation was verified by XRD analysis and the 14C concentrations of different fractions were compared. The results show that the calcite fraction in the studied vermetid samples varied from 12 to 63% and aragonite fraction ages are up to 2 14C kyr older than the raw samples, thus confirming the efficacy of CarDS in removing young carbonates and the importance of density separation to vermetids prior to accelerator mass spectrometry (AMS) dating.

Keywords

CarDSrecrystallizationsample preparationsodium polytungstate
Type
Research Article
Information
Radiocarbon , Volume 62 , Issue 2 , April 2020 , pp. 335 - 348
Copyright
© 2020 by the Arizona Board of Regents on behalf of the University of Arizona

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