Electron spin resonance dating of megafauna from Lagoa dos Porcos, Piaui, Brazil
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2014
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Radiation Protection Dosimetry
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Excavations performed at Lagoa dos Porcos site revealed a vast amount of extinct mammal fossil remains, becoming one of the
richest palaeontological occurrences in the Serra da Capivara National Park region, a UNESCO World Heritage. Although
anatomic and taxonomic aspects of extinct Quaternary mammals are relatively well known, chronologic information for deposits
is rare. In this context, electron spin resonance (ESR) dating of megafauna samples provides important information for establishing a chronological background. This work presents the ESR dating of two teeth, one of Gomphotheriidae and other of
Toxodontinae. Dose – response curves of each sample were constructed using spectra acquired with a JEOL FA-200 X-Band
spectrometer resulting in equivalent dose (De) of 220+40 Gy and 39+2 Gy for Toxodontinae and Gomphotheriidae tooth, respectively. The conversion of De in age was made using ROSY ESR dating software resulting in 26+4 and 22+3 ka. These
results place Lagoa dos Porcos fossil assemblage within the Late Pleistocene. These dates overlap with a period of abrupt increase in rainfall in northeast Brazil, and it is possible that this environmental change is related to the formation of this deposit.
Como referenciar
KINOSHITA, ANGELA; MAYER, ELVER; MENDES, VINICIUS R.; FIGUEIREDO, ANA M.G.; BAFFA, OSWALDO. Electron spin resonance dating of megafauna from Lagoa dos Porcos, Piaui, Brazil. Radiation Protection Dosimetry, v. 159, n. 1-4, p. 212-219, 2014. DOI: 10.1093/rpd/ncu178. Disponível em: http://repositorio.ipen.br/handle/123456789/9049. Acesso em: 28 Mar 2025.
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.