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	Provedor de dados Anais da ABC (AABC) (2) Autor Chemale Júnior,Farid (1) Dussin,Ivo A. (1) Estumano,Gérson S. (1) Hartmann,Léo A. (1) Kawashita,Koji (1) Krymsky,Robert S. (1) Lafon,Jean-Michel (1) Macambira,Moacir J.B. (1) Takehara,Lucy (1) Mais... Palavra-chave U-Pb dating (2) Accessory mineral (1) Chemical abrasion (1) ID-TIMS (1) Isotope dilution (1) LA-MC-ICPMS (1) Zircon (1) Zircon dissolution (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Info:eu-repo/semantics/other (1) Ano 2012 (1) 2007 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última U-Pb dating by zircon dissolution method using chemical abrasion Anais da ABC (AABC) Takehara,Lucy; Chemale Júnior,Farid; Hartmann,Léo A.; Dussin,Ivo A.; Kawashita,Koji. Chemical abrasion was carried out on zircons grains of the Temora II standard for U-Pb dating prior to analyses using in situ Laser Ablation-MultiCollector Ion Coupled Plasma Mass Spectrometer (LA-ICPMS) followed by the Isotope Dissolution Thermal Ionization Mass Spectrometer (ID-TIMS) method. The proposed methodology was herein applied in order to reduce primarily the effects of secondary Pb loss, the presence of common lead and/or silicate impurities. Nine Temora II zircon grains were analyzed by the laser ablation method yielding an age of 418.3±4.3 Ma. Zircon grains of a same population were separated for chemical abrasion before dissolution and mass spectrometry analyses. Six fractions of them were separated for isotope dissolution using 235U-205Pb... Tipo: Info:eu-repo/semantics/other Palavras-chave: Chemical abrasion; ID-TIMS; LA-MC-ICPMS; U-Pb dating; Zircon dissolution. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200011 Uranium-lead dating method at the Pará-Iso isotope geology laboratory, UFPA, Belém - Brazil Anais da ABC (AABC) Krymsky,Robert S.; Macambira,Moacir J.B.; Lafon,Jean-Michel; Estumano,Gérson S.. 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... Tipo: Info:eu-repo/semantics/article Palavras-chave: U-Pb dating; Zircon; Accessory mineral; Isotope dilution. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100014 Registros recuperados: 2 Primeira ... 1 ... Última

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