Radiometric and stimulated luminescent characterization of Amazonian sediments from the Middle Rio Negro, Western Amazon
Carregando...
Data
Data de publicação
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Radiation Physics and Chemistry
Exportar
Resumo
The sediments were collected from paleodunes, river terraces, islands, and sand bars at Mariuá Archipelago, Rio Negro, Brazil. XRD analysis revealed that quartz is the predominant mineral along with a trace quantity of kaolinite. Neutron activation analysis of the sediments revealed the assembly of rare-earth elements, metals and semi-metals. The values of U and Th were found to be 3–5 ppm in paleodunes and 9–16 ppm in terraces, and K-40 concentration is below detectable limit. The OSL of quartz (dune) is composed of three components with decay times of 0.2, 11.0 and 350 s, respectively. This OSL emission is related to the TL peaks below 380 °C. Also, photo-transferred TL is observed in the temperature range of 190–250 °C for a blue stimulation of 500 s. TL peaks kinetic parameters were calculated and discussed. The lifetimes of TL peaks at 272 and 355 °C are approximately 4.0×104 and 1.5×109 years, respectively. Using the conventional SAR protocol, 11 samples were dated, including two old paleodunes with ages of 124.4 and 169.7 ka, increasing the age interval of the site, the other samples were younger sediments, with ages between 0.39 and 53.9 ka.
Como referenciar
TATUMI, SONIA H.; YEE, MARCIO; SOARES, EMILIO A.A.; SOUZA, JEFFERSON J. de; GRUDZIN, EMANUELE D.O.; MUNITA, CASIMIRO S.; RIBEIRO, ROGÉRIO B.; SOARES, ALVARO de F.; SILVA, NOEMI A.; FERNANDES, CAROLINE P.; MATHIAS, MATHEUS T.; ROCCA, RENE R.; NAGABHUSHANA, K.R.; LOKESHA, H.S.; ROCHA, MARCELO S.; LOPEZ, LUIS A.C.; VENANCIO, DIEGO W.P.; COSTA, SOLANGE dos S. Radiometric and stimulated luminescent characterization of Amazonian sediments from the Middle Rio Negro, Western Amazon. Radiation Physics and Chemistry, v. 212, p. 1-12, 2023. DOI: 10.1016/j.radphyschem.2023.111117. Disponível em: http://repositorio.ipen.br/handle/123456789/34203. Acesso em: 30 Dec 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.