Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Anais da ABC (AABC) (2) Autor Bühn,Bernhard (1) C.A. NETO,CARLA (1) Dantas,Elton L. (1) HEILBRON,MONICA (1) LOBATO,MARCELA (1) Matteini,Massimo (1) PASSARELLI,CLAUDIA R. (1) Pimentel,Marcio M. (1) VALERIANO,CLAUDIO M. (1) Mais... Palavra-chave U-Pb (2) Borborema Province (1) Brasiliano (1) Gondwana (1) Isotope dilution mass spectrometry (1) LA-MC-ICP-MS (1) Lu-Hf (1) Monazite (1) Zircon (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2014 (1) 2010 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Monazite ID-TIMS U-Pb geochronology in the LAGIR laboratory, Rio de Janeiro State University: protocols and first applications to the assembly of Gondwana supercontinent in SE-Brazil Anais da ABC (AABC) C.A. NETO,CARLA; VALERIANO,CLAUDIO M.; PASSARELLI,CLAUDIA R.; HEILBRON,MONICA; LOBATO,MARCELA. The chemical and spectrometric procedures of the U-Pb geochronology method on monazites, recently installed in the LAGIR laboratory, are described in detail. In addition, preliminary results on monazite samples from the Brasília and Ribeira belts are reported and discussed in the context of the regional geology. Several experiments for calibration of ion exchange chromatographic columns with the AG-1x8 resin, were performed with HCl, using dissolved natural monazite samples. The Pb blanks of reagents are ∼0.5 pg/g in acids and ∼1 pg/g in H2O. The total Pb blanks in chemical procedures were below 22 pg. Preliminary results are presented from three case studies related to Brasiliano orogenic belts of SE-Brazil, which correlate very well with previous age... Tipo: Info:eu-repo/semantics/article Palavras-chave: Gondwana; Brasiliano; Isotope dilution mass spectrometry; U-Pb; Monazite. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100171 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

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco