ESR dating of late Quaternary megafauna fossils from João Dourado, Bahia, Brazil
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2020
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ANA MARIA GRACIANO FIGUEIREDO
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Journal of South American Earth Sciences
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We applied the ESR (Electron Spin Resonance) dating method to fossils of Notiomastodon platensis (two teeth) and
Toxodontinae (two teeth) found in the fossiliferous deposit of Lajedão do Patrício, João Dourado, State of Bahia,
Brazil, to identify the period of formation of this fossil accumulation. Neutron Activation Analysis was applied to
determine the concentrations of the main radioisotopes in enamel, dentine and sediment. The ages found for N.
platensis are 16.8 ± 2.6 ka and 12.5 ± 2.3 ka, while the ages for Toxodontinae are 9.6 ± 1 ka and 9.1 ± 1
ka. The results for Notiomastodon. platensis and Toxodontinae are similar to other fossiliferous of Brazil. The
estimated maximum time-averaging for Lajedão do Patrício is 11.3 ka, indicating a long period of accumulation
of skeletal remains, attributed to resedimentation and reworking. The crossing between the period of formation
of fossil assemblage Lajedão do Patrício and ages of climatic variations diponible in paleoclimatic curves produced
for the Quaternary of northeastern Brazil indicates different climatic and environmental conditions during
the formation of the deposit.
Como referenciar
FARIA, FABIO H.C.; KINOSHITA, ANGELA; CARVALHO, ISMAR de S.; ARAUJO-JUNIOR, HERMINIO I. de; PEGORIN, PRISCILA; FIGUEIREDO, ANA M.G.; BAFFA, OSWALDO. ESR dating of late Quaternary megafauna fossils from João Dourado, Bahia, Brazil. Journal of South American Earth Sciences, v. 101, p. 1-7, 2020. DOI: 10.1016/j.jsames.2020.102586. Disponível em: http://repositorio.ipen.br/handle/123456789/31384. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.