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	Provedor de dados Anais da ABC (AABC) (2) Autor Bühn,Bernhard (2) Dantas,Elton L. (2) Matteini,Massimo (2) Pimentel,Marcio M. (1) Pimentel,Márcio M. (1) Palavra-chave LA-MC-ICP-MS (2) Zircon (2) Age dating (1) Borborema Province (1) Geochronology (1) Lu-Hf (1) U-Pb (1) U-Pb isotopes (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2010 (1) 2009 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última High spatial resolution analysis of Pb and U isotopes for geochronology by laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) Anais da ABC (AABC) Bühn,Bernhard; Pimentel,Márcio M.; Matteini,Massimo; Dantas,Elton L.. Age determinations using the 235U and 238U radioactive decay series to the daughter isotopes 207Pb and 206Pb, respectively, using the mineral zircon (ZrSiO4), are widely used to decipher geological processes. A new method developed in the last couple of years, the laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS), overcomes previous laborious sample preparation, and yields isotopic ratios and age data with a high spatial resolution of ten of microns. The present study describes the analytical set-up and data reduction process as presently applied at the Laboratory for Geochronology of the University of Brasília. It explores the precision and accuracy of the method by cross-analysing three international zircon... Tipo: Info:eu-repo/semantics/article Palavras-chave: Geochronology; U-Pb isotopes; LA-MC-ICP-MS; Zircon; Age dating. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100011 Combined U-Pb and Lu-Hf isotope analyses by laser ablation MC-ICP-MS: methodology and applications Anais da ABC (AABC) Matteini,Massimo; Dantas,Elton L.; Pimentel,Marcio M.; Bühn,Bernhard. The Lutetium-Hafnium isotopic system represents one of the most innovative and powerful tools for geochronology and isotopic studies. Combined U-Pb and Lu-Hf in situ analyses on zircon by LA-MC-ICP-MS permit to characterize isotopically the host magma from which it crystallized furnishing significant information for sediment provenance and crustal evolution studies. In this paper e describe the Lu-Hf systematic by LA-MC-ICP-MS developed in the laboratory of Geochronology of the University of Brasilia and report the results obtained by repeated analyses of 176Hf/177Hf isotopic ratio of three zircon standards: GJ-1 = 0.282022 ± 11 (n=56), Temora 2 = 0.282693 ± 14 (n=25) and UQZ = 0.282127 ± 33 (n=11). The 176Hf/177Hf ratio (0.282352 ± 22, n=14) of gem... Tipo: Info:eu-repo/semantics/article Palavras-chave: LA-MC-ICP-MS; Lu-Hf; U-Pb; Zircon; Borborema Province. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200023 Registros recuperados: 2 Primeira ... 1 ... Última

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