Luminescence dating of quaternary deposits in geology in Brazil.
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.
Tatumi
Sonia Hatsue
SH
Faculdade de Tecnologia de São Paulo, Praça Cel. Fernando Prestes, 30, 01124-060, São Paulo, SP, Brazil. tatumi@fatecsp.br
Gozzi
Giuliano
G
Yee
Márcio
M
de Oliveira
Victor Inácio
VI
Sallun
Alethéa Ernandes Martins
AE
Suguio
Kenitiro
K
D001938:Brazil; D019015:Geologic Sediments / Q000737:chemistry*; D005844:Geology / Q000379:methods; D006207:Half-Life; D008422:Materials Testing / Q000379:methods*; D013819:Thermoluminescent Dosimetry / Q000379:methods*