Luminescence dating of quaternary deposits in geology in Brazil.
Radiat Prot Dosimetry
; 119(1-4): 462-9, 2006.
Article
em En
| MEDLINE
| ID: mdl-16782979
In the present work, systematic dating by luminescence methods has been done on 50 Quaternary geological samples within the study area of São Paulo State, Brazil. Bleaching experiments showed that residual TL intensity of 375 degrees C peak, of the quartz, was obtained after 10 h of sunlight exposition. Intensities decays of the 325 and 375 degrees C TL peaks can be fitted using second order exponential equation. Paleodose values were evaluated using regeneration methods with multiple aliquots. Samples dated indicate preliminary ages varying from 9 +/- 1 to 935 +/- 130 ka for colluvio-elluvial deposits, and from 17 +/- 2 to 215 +/- 30 ka for alluvial deposits of the study area. They cover four peneplained surfaces shaped during the Quaternary: I (1000-400 ka), II (400-120 ka), III (120-10 ka) and IV (10 ka until today), in decreasing order.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dosimetria Termoluminescente
/
Teste de Materiais
/
Sedimentos Geológicos
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Radiat Prot Dosimetry
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido