OSL dating of sediments from Negro and Solimoes rivers - Amazon, Brazil

Autor(es)

Fiore, M. ^[1] ; Soares, E. A. A. ^[2] ; Mittani, J. C. R. ^[1] ; Yee, M. ^[1] ; Tatumi, S. H. ^[3]

Afiliação do(s) autor(es)

^[1] Fac Tecnol Sao Paulo FATEC SP, BR-01124060 Sao Paulo - Brazil

^[2] Univ Fed Amazonas, Manaus, Amazonas - Brazil

^[3] Univ Fed Sao Paulo, BR-11030900 Santos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Radiation Physics and Chemistry; v. 95, p. 113-115, FEB 2014.
• Citações Web of Science: 3

Resumo

In this work, the OSL dating results of Quaternary fluvial deposits from the confluence of Negro and Solimoes rivers were studied. The equivalent doses (D-e) of sediments were obtained using a Single Aliquot Regeneration (SAR) protocol. Statistic studies were made using frequency histogram, weighted histogram and Radial plot in order to analyze the D-e fluctuations. Ages from 74.5 to 205 thousand of years (Pleistocene) were recorded. The gamma-ray spectroscopy was used to evaluate the natural radioisotopes concentrations of the samples and low concentrations were found with values between 0.64 and 3.71 ppm for U-235 and U-238; 2.01-9.77 ppm for Th-232; already, for K-40, the concentration was negligible. The OSL dating of sediments has contributed to a better understanding of the evolution of Negro and Solimbes rivers, in Amazon, Brazil. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/02069-2 - Implantação e desenvolvimento da metodologia de datação de grão-único, por luminescência opticamente estimulada
• Beneficiário: Sonia Hatsue Tatumi
• Modalidade de apoio: Auxílio à Pesquisa - Regular