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

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

Author Fiore, M. Google Scholar
Soares, E. A. A. Google Scholar
Mittani, Juan Carlos Ramirez Google Scholar
Yee, Marcio Google Scholar
Tatumi, Sonia Hatsue Autor UNIFESP Google Scholar
Institution Fac Tecnol São Paulo FATEC SP
Univ Fed Amazonas
Universidade Federal de São Paulo (UNIFESP)
Abstract 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 B.V. All rights reserved.
Keywords Amazon
OSL
Sediments
SAR Protocol
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Grant number FAPESP: 2009/02069-2
Date 2014-02-01
Published in Radiation Physics and Chemistry. Oxford: Pergamon-Elsevier B.V., v. 95, p. 113-115, 2014.
ISSN 0969-806X (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 113-115
Origin http://dx.doi.org/10.1016/j.radphyschem.2012.12.041
Access rights Closed access
Type Article
Web of Science ID WOS:000329271400026
URI http://repositorio.unifesp.br/handle/11600/37388

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