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  Argonite fraction dating of vermetids in the context of paleo sea-level curves reconstruction

Moreira, V. N., Macario, K. D., Guimarães, R. B., Dias, F. F., Araujo, J. C., Jesus, P., et al. (2020). Argonite fraction dating of vermetids in the context of paleo sea-level curves reconstruction. Radiocarbon, 2020.7. doi:10.1017/RDC.2020.7.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-AF17-D Version Permalink: http://hdl.handle.net/21.11116/0000-0005-AF18-C
Genre: Journal Article

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 Creators:
Moreira, Vinicius N, Author
Macario, Kita D, Author
Guimarães, Renato B, Author
Dias, Fábio F, Author
Araujo, Julia C, Author
Jesus, Perla, Author
Douka, Katerina1, Author              
Affiliations:
1FINDER, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2541700              

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Free keywords: CarDS, recrystallization, sample preparation, sodium polytungstate
 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.

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Language(s): eng - English
 Dates: 2020-02-14
 Publication Status: Published online
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1017/RDC.2020.7
Other: shh2516
 Degree: -

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Title: Radiocarbon
Source Genre: Journal
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Publ. Info: New Haven : American journal of science
Pages: - Volume / Issue: - Sequence Number: 2020.7 Start / End Page: - Identifier: ISSN: 0033-8222
CoNE: https://pure.mpg.de/cone/journals/resource/991042724398366