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	Provedor de dados Anais da ABC (AABC) (2) Autor ARMSTRONG,RICHARD A. (1) C.A. NETO,CARLA (1) DANTAS,ELTON L. (1) FUCK,REINHARDT A. (1) HEILBRON,MONICA (1) LOBATO,MARCELA (1) PASSARELLI,CLAUDIA R. (1) PIMENTEL,MÁRCIO M. (1) VALERIANO,CLAUDIO M. (1) Mais... Palavra-chave Brasiliano (2) Brasília Belt (1) Gondwana (1) Isotope dilution mass spectrometry (1) Itapuranga (1) Monazite (1) Pirineus Syntaxis (1) U-Pb (1) U-Pb SHRIMP (1) Uruana (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2014 (1) 2003 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Shrimp and conventional U-Pb age, Sm-Nd isotopic characteristics and tectonic significance of the K-rich Itapuranga suite in Goiás, Central Brazil Anais da ABC (AABC) PIMENTEL,MÁRCIO M.; DANTAS,ELTON L.; FUCK,REINHARDT A.; ARMSTRONG,RICHARD A.. The Itapuranga alkali granite and Uruana quartz syenite are large K-rich EW-elongated intrusions, in the central part of the Neoproterozoic Brasília Belt, central Brazil. They are associated with Pireneus lineaments, which cut the regional NNW-SSE structures of the southern part of the belt. SHRIMP and conventional U-Pb data for the Itapuranga and Uruana intrusions indicate crystallization ages of 624 ± 10 Ma and 618 ± 4 Ma, respectively. Three zircon cores from the Itapuranga granite yielded U-Pb ages between 1.79 and 1.49 Ga. Sm-Nd T DM ages for both intrusions are 1.44 Ga and epsilonNd(T) values are -5.1 and -5.7, suggesting the input of material derived from older (Paleo- to Mesoproterozoic) sialic crust in the origin of the parental magmas. Magma... Tipo: Info:eu-repo/semantics/article Palavras-chave: Brasília Belt; Brasiliano; Itapuranga; Uruana; U-Pb SHRIMP; Pirineus Syntaxis. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100011 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 Registros recuperados: 2 Primeira ... 1 ... Última

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