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	Provedor de dados Anais da ABC (AABC) (3) Autor FUCK,REINHARDT A. (3) PIMENTEL,MÁRCIO M. (2) ARMSTRONG,RICHARD (1) ARMSTRONG,RICHARD A. (1) BEZERRA,FRANCISCO H.R. (1) DANTAS,ELTON L. (1) FERREIRA,JOAQUIM M. (1) FISCHEL,DANIELLE P. (1) MOURA,ANA CATARINA A. (1) NASCIMENTO,ADERSON F. DO (1) OLIVEIRA,PAULO H.S. DE (1) Mais... Palavra-chave Brasília Belt (2) U-Pb SHRIMP (2) Basement rocks (1) Brasiliano (1) Itapuranga (1) Meruoca pluton (1) Pirineus Syntaxis (1) Riacho Fundo fault (1) Seismological data (1) Sm-Nd isotopic data (1) Transbrasiliano Lineament (1) Uruana (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2014 (1) 2003 (1) 2001 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 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 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 Seismogenic faulting in the Meruoca granite, NE Brazil, consistent with a local weak fracture zone Anais da ABC (AABC) MOURA,ANA CATARINA A.; OLIVEIRA,PAULO H.S. DE; FERREIRA,JOAQUIM M.; BEZERRA,FRANCISCO H.R.; FUCK,REINHARDT A.; NASCIMENTO,ADERSON F. DO. A sequence of earthquakes occurred in 2008 in the Meruoca granitic pluton, located in the northwestern part of the Borborema Province, NE Brazil. A seismological study defined the seismic activity occurring along the seismically-defined Riacho Fundo fault, a 081° striking, 8 km deep structure. The objective of this study was to analyze the correlation between this seismic activity and geological structures in the Meruoca granite. We carried out geological mapping in the epicentral area, analyzed the mineralogy of fault rocks, and compared the seismically-defined Riacho Fundo fault with geological data. We concluded that the seismically-defined fault coincides with ∼E–W-striking faults observed at outcrop scale and a swarm of Mesozoic basalt dikes. We... Tipo: Info:eu-repo/semantics/article Palavras-chave: Meruoca pluton; Riacho Fundo fault; Seismological data; Transbrasiliano Lineament. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401631 Registros recuperados: 3 Primeira ... 1 ... Última

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