SciELO - Scientific Electronic Library Online

 
vol.88 issue4Geostatistical Approach for Spatial Interpolation of Meteorological DataCordão Formation: loess deposits in the southern coastal plain of the state of Rio Grande do Sul, Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

WATANABE, SHIGUEO et al. Dating stalagmite from Caverna do Diabo (Devil´S Cave) by TL and EPR techniques. An. Acad. Bras. Ciênc. [online]. 2016, vol.88, n.4, pp.2137-2142. ISSN 1678-2690.  https://doi.org/10.1590/0001-3765201620150755.

A cylindrical fragment of stalagmite from Caverna do Diabo, State of São Paulo, Brazil, has been studied and dated by thermoluminescence and electron paramagnetic resonance techniques. The thermoluminescence glow curves of stalagmite samples and subsequently gamma irradiated, have shown rise of three peaks at 135, 180 and 265 °C. From electron paramagnetic resonance spectra of stalagmite was possible to clearly identify three paramagnetic centers in the g = 2.0 region: Centers I, II and III are due to , and , respectively. The additive method was applied to calculate the accumulated dose using thermoluminescence peak at 265 °C and the electron paramagnetic resonance signal at g = 1.9973 of CO- 2 radical. The ages of the different slices of stalagmite were determined from the Dac- values and Dan- value, obtaining an average of 86410 for central slice, 53421 for second slice, 31490 for third slice and 46390 years B.P. for the central region of upper end.

Keywords : stalagmite; Caverna do Diabo; dating; TL; EPR.

        · text in English     · English ( pdf )