Comparison of population and external detector method dating in epidote

Autor(es)

Curvo‚ EAC ; Iunes‚ PJ ; Guedes‚ S. ; Palissari‚ R. ; Hadler‚ JC

• Tipo de documento: Artigo Científico
• Fonte: Radiation Measurements; v. 42, n. 8, p. 1307-1314, 2007.

Resumo

Epidote fission-track dating (FTD) was performed through both Population and external detector method (EDM) in five samples from the Mantiqueira Mountain range, southwestern Brazil. The ages obtained via population conducted to a weighted mean age of (114 +/- 19) Ma. In order to perform EDM dating, it was necessary to measure the efficiency factor (g) between muscovite mica and epidote. Three measurements were performed and the weighted mean g value obtained was (0.57 +/- 0.03). The weighted EDM age was (98 +/- 7) Ma. The population error magnitude occurs due to the existence of few useful epidote grains. EDM provides dating with fewer grains, however there are difficulties concerning etching anisotropy that should be regarded. Both dating methods agreed. (c) 2007 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 02/13258-1 - Datação das serras da Mantiqueira e do Mar utilizando-se o método do traços de fissão aplicado ao epídoto
• Beneficiário: Eduardo Augusto Campos Curvo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 00/03960-5 - História de exumação da plataforma sulamericana a exemplo da região sudeste brasileira: termocronologia por traços de fissão e sistemáticas ar/ar e sm/nd
• Beneficiário: Peter Christian Hackspacher
• Modalidade de apoio: Auxílio à Pesquisa - Temático