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PRELIMINARY RADIOCARBON DATING RESULTS OF BONE SAMPLES AT THE LAC-UFF, BRAZIL

Published online by Cambridge University Press:  17 December 2020

Fabiana Oliveira*
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil
Kita Macario
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil
Karolayne Silva
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil
Bruna Pereira
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil
Ingrid Chanca
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil Max Planck Institute for Biogeomestry – Jena, Germany
Eduardo Alves
Affiliation:
University of Oxford, UK
Alberto Cid
Affiliation:
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca – Valença, Brazil
Rita Scheel-Ybert
Affiliation:
Museu Nacional da Universidade Federal do Rio de Janeiro – Rio de Janeiro, Brazil
Dayanne Amaral
Affiliation:
Universidade Federal Fluminense – Niterói, Brazil Centro Federal de Educação Tecnológica Celso Suckow da Fonseca – Nova Friburgo, Brazil
Natacha Ribeiro-Pinto
Affiliation:
Museu Nacional da Universidade Federal do Rio de Janeiro – Rio de Janeiro, Brazil
Luiz C Ruiz Pessenda
Affiliation:
CENA-USP – São Paulo, Brazil
*
*Corresponding author. Email: fabianaoliveira@id.uff.br

Abstract

Collagen extraction depends on the state of bone preservation, and the acidity of Brazilian soils often prevents the use of this material for radiocarbon dating. When available, however, bone samples constitute very important chronological records for both archaeological sites and natural depositional sites of specific animals. The extraction of collagen was performed using two filters, the first aiming to remove insoluble contaminants, and the second, a vivaspin ultrafilter 30KD to retain large molecular weight materials. The collagen was liofilized and converted to CO2 by combustion in sealed quartz tubes with CuO and Ag. The graphite was produced by zinc reduction in independently sealed Pyrex™ tubes. In order to verify the accuracy of this protocol, we analyzed a modern bone and four previously dated fragments, including those from the Sixth International Radiocarbon Intercomparison (SIRI), and a fragment of human bone from the Amourins site, a Brazilian shellmound. The results for the known age material are in agreement with the expected and the studied sector of Amourins shellmound was dated 4100–3900 years cal BP from a chronological model performed with charcoal dating found in different stratigraphic layers. Samples were dated at the radiocarbon laboratory of Universidade Federal Fluminense (LAC-UFF) in Brazil.

Type
Conference Paper
Copyright
© The Author(s), 2020. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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Footnotes

Selected Papers from the 1st Latin American Radiocarbon Conference, Rio de Janeiro, 29 Jul.–2 Aug. 2019

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