ESR dating of late Quaternary megafauna fossils from Joao Dourado, Bahia, Brazil

Author(s)

Cortes Faria, Fabio Henrique ^[1] ; Kinoshita, Angela ^{[2, 3]} ; Carvalho, Ismar de Souza ^{[1, 4]} ; de Araujo-Junior, Herminio Ismael ^[5] ; Pegorin, Priscila ^[2] ; Figueiredo, Ana Maria G. ^[6] ; Baffa, Oswaldo ^[7]

Affiliation

^[1] Univ Fed Rio de Janeiro, Dept Geol, Inst Geociencias, BR-21941916 Rio De Janeiro, RJ - Brazil

^[2] Univ Sagrado Coracao, BR-17011160 Bauru, SP - Brazil

^[3] PGMADRE Univ Oeste Paulista UNOESTE, BR-19067175 Presidente Prudente, SP - Brazil

^[4] Kinoshita, Angela, PGMADRE Univ Oeste Paulista UNOESTE, BR-19067175 Presidente Prudente, SP, Brazil.Cortes Faria, Fabio Henrique, Univ Fed Rio de Janeiro, Dept Geol, Inst Geociencias, BR-21941916 Rio De Janeiro, RJ - Brazil

^[5] Univ Estado Rio de Janeiro, Dept Estratig & Paleontol, BR-20550013 Rio De Janeiro, RJ - Brazil

^[6] Inst Pesquisas Energet & Nucl IPEN, BR-05508000 Sao Paulo, SP - Brazil

^[7] Univ Sao Paulo, Dept Fis, Fac Filosofia Ciencias & Letras, BR-14040901 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Journal of South American Earth Sciences; v. 101, AUG 2020.
• Web of Science Citations: 0

Abstract

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 Lajeddo do Patricio, Joao 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 Notiomasto don. platensis and Toxodontinae are similar to other fossiliferous of Brazil. The estimated maximum time-averaging for Lajeddo do Patricio 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 Lajeddo do Patricio 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. (AU)

• FAPESP's process: 18/02866-9 - EPR Biodose 2018 Conference
• Grantee: Angela Mitie Otta Kinoshita
• Support Opportunities: Research Grants - Meeting - Abroad
• FAPESP's process: 07/06720-4 - Advances in electron spin resonance dosimetry, archeological dating and biomaterials characterization
• Grantee: Oswaldo Baffa Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/10690-5 - Electron spin resonance dating of Notiomastodon platensis fossil tooth
• Grantee: Priscila Pegorin
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 13/07699-0 - Research, Innovation and Dissemination Center for Neuromathematics - NeuroMat
• Grantee: Oswaldo Baffa Filho
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC