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metadata.dc.type: Artigo de Periódico
Issue Date: Mar-2007
metadata.dc.creator: KRYMSKY, Robert Shamilevich
MACAMBIRA, Moacir José Buenano
LAFON, Jean Michel
ESTUMANO, Gérson dos Santos
Title: Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém – Brazil
Citation: KRYMSKY, Robert S., et al. Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém – Brazil. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 79, n. 1, p. 115-128, mar. 2007. Disponível em: <>. Acesso em: 16 mar. 2011. <>.
Abstract: 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 Teflon™ microcapsules in steel jacket Teflon™ Parr Instrument™ bomb or Teflon™ 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.
Keywords: Geocronologia U-Pb
Minerais acessórios
Diluição isotópica
ISSN: 0001-3765
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - IG

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