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	Provedor de dados Anais da ABC (AABC) (4) Autor FUCK,REINHARDT A. (2) PIMENTEL,MÁRCIO M. (2) ARMSTRONG,RICHARD (1) ARMSTRONG,RICHARD A. (1) Armstrong,Richard (1) Barrueto,Héctor R. (1) Cordani,Umberto G. (1) DANTAS,ELTON L. (1) Dunyi,Liu (1) FISCHEL,DANIELLE P. (1) Hollanda,Maria Helena B. M. (1) Martins,Veridiana T.S. (1) Pereira,Ronaldo M. (1) Pimentel,Márcio M. (1) Teixeira,Wilson (1) Ávila,Ciro A. (1) Mais... Palavra-chave U-Pb SHRIMP (4) Brasília Belt (2) Arenópolis (1) Basement rocks (1) Basic magmatism (1) Brasiliano (1) Crustal contamination (1) Glória quartz-monzodiorite (1) Goiás Magmatic Arc (1) Itapuranga (1) Mineiro belt (1) Pirineus Syntaxis (1) Sm-Nd isotopes (1) Sm-Nd isotopic data (1) São Francisco Craton (1) Uruana (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2006 (1) 2003 (2) 2001 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 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 The Glória quartz-monzodiorite: isotopic and chemical evidence of arc-related magmatism in the central part of the Paleoproterozoic Mineiro belt, Minas Gerais State, Brazil Anais da ABC (AABC) Ávila,Ciro A.; Teixeira,Wilson; Cordani,Umberto G.; Barrueto,Héctor R.; Pereira,Ronaldo M.; Martins,Veridiana T.S.; Dunyi,Liu. The Glória quartz-monzodiorite, one of the mafic plutons of the Paleoproterozoic Mineiro belt, is intrusive into banded gneisses, amphibolites, schists and phyllites of the Rio das Mortes greenstone belt, in the southern portion of the São Francisco Craton, State of Minas Gerais, Brazil. The Glória quartz-monzodiorite yields a SHRIMP U-Pb zircon age of 2188 ± 29 Ma, suggesting a tectonic relationship with the pre-collisional phase of the Mineiro belt. According to the Nd isotopic evidence (epsilonNd(T) = -3.4; T DM = 2.68 Ga) the original magmas was formed by a mixture among Archean crustal material and Paleoproterozoic juvenile magma. The Glória quartz-monzodiorite shows metaluminous and calc-alkaline tendency with intermediate K content, comparable to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Glória quartz-monzodiorite; U-Pb SHRIMP; Sm-Nd isotopes; Mineiro belt; São Francisco Craton. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300013 Shrimp U-Pb age and Sr-Nd isotopes of the Morro do Baú mafic intrusion: implications for the evolution of the Arenópolis volcano-sedimentary sequence, Goiás Magmatic Arc Anais da ABC (AABC) Pimentel,Márcio M.; Hollanda,Maria Helena B. M.; Armstrong,Richard. The Arenópolis volcano-sedimentary sequence is located in the southern part of the Goiás Magmatic Arc and includes a ca. 900 Ma calc-alkaline arc sequence made of volcanic rocks ranging in composition from basalts to rhyolites, metamorphosed under greenschist to amphibolite facies. Small calc-alkaline gabbro to granite sub-volcanic bodies are also recognized. The Morro do Baú intrusion is the largest of these intrusions, and is made of gabbros and diorites. Zircon grains separated from one gabbro sample and analyzed by SHRIMP I yielded the mean 206Pb/238U age of 890 +/- 8 Ma, indicating that the intrusion is roughly coeval or only slightly younger than the Arenópolis volcanics. Contrary to the metavolcanics, which are juvenile, the Nd isotopic composition... Tipo: Info:eu-repo/semantics/article Palavras-chave: Goiás Magmatic Arc; Arenópolis; U-Pb SHRIMP; Basic magmatism; Crustal contamination. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300006 U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil Anais da ABC (AABC) FISCHEL,DANIELLE P.; PIMENTEL,MÁRCIO M.; FUCK,REINHARDT A.; ARMSTRONG,RICHARD. U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanic sample yielded 2115 ± 23 Ma and from the granite yielded 2089 ± 14 Ma, interpreted as crystallization ages of these rocks. Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicating a crystallization age of 2262 ± 110 Ma and positive epsilonNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubatuba Granite have Paleoproterozoic T DM model ages between 2.30 and 2.42 Ga and epsilonNd(T) values vary between -0.22 and -0.58. The oldest T DM value refers to a... Tipo: Info:eu-repo/semantics/article Palavras-chave: U-Pb SHRIMP; Sm-Nd isotopic data; Brasília Belt; Basement rocks. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300012 Registros recuperados: 4 Primeira ... 1 ... Última

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