| Registro completo |
| Provedor de dados: |
Anais da ABC (AABC)
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| País: |
Brazil
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| Título: |
Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém - Brazil
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| Autores: |
Krymsky,Robert S.
Macambira,Moacir J.B.
Lafon,Jean-Michel
Estumano,Gérson S.
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| Data: |
2007-03-01
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| Ano: |
2007
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| Palavras-chave: |
U-Pb dating
Zircon
Accessory mineral
Isotope dilution
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100014
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| Editor: |
Academia Brasileira de Ciências
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| Relação: |
10.1590/S0001-37652007000100014
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| Formato: |
text/html
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| Fonte: |
Anais da Academia Brasileira de Ciências v.79 n.1 2007
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| Direitos: |
info:eu-repo/semantics/openAccess
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