Data/hora: 06/06/2024 02:44:31

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém - Brazil	
Autores: 	Krymsky,Robert S.; Macambira,Moacir J.B.; Lafon,Jean-Michel; Estumano,Gérson S.	
Data: 	2007-03-01	
Ano: 	2007	
Palavras-chave: 	U-Pb dating; Zircon; Accessory mineral; Isotope dilution.	
Resumo: 	Analytical procedures for U-Pb isotope dilution analyses at the Pará-Iso isotope geology laboratory of the Federal University of Pará (UFPA) are described in detail. The procedures are applied to zircon, titanite, rutile, apatite, columbite-tantalite and whole rock. Reagent preparation and chemical processing are done in clean-room conditions. Samples are dissolved using TeflonTM microcapsules in steel jacket TeflonTM Parr InstrumentTM bomb or TeflonTM screw cap containers. U and Pb are separated using anion exchange AG 1x8 resin columns. Typical blanks for mineral sample amounts of 0.01 to 1.0 mg are less than 1 pg U and 20-30 pg Pb. Isotope analysis of the U and Pb from the same filament are carried out using a Finnigan MAT 262 mass-spectrometer in static and dynamic modes. The current analytical level is demonstrated on analyses of international standard zircon 91500 with three different 235U-205Pb and 235U-208Pb isotope tracers and whole rock standards. Results of analyses of two zircon samples are also presented.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100014	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/S0001-37652007000100014	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.79 n.1 2007	
Fonte: 	info:eu-repo/semantics/openAccess