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	Provedor de dados Anais da ABC (AABC) (5) Autor PIMENTEL,MÁRCIO M. (5) FUCK,REINHARDT A. (2) ACENOLAZA,FLORENCIO G. (1) ALONSO,RICARDO N. (1) ARMSTRONG,RICHARD (1) ARMSTRONG,RICHARD A. (1) BOTELHO,NILSON F. (1) DANTAS,ELTON L. (1) FERREIRA,VALDEREZ P. (1) FISCHEL,DANIELLE P. (1) PARADA,MIGUEL A. (1) SIAL,ALCIDES N. (1) TOSELLI,ALEJANDRO J. (1) Mais... Palavra-chave Brasília Belt (2) U-Pb SHRIMP (2) Basement rocks (1) Brasiliano (1) Itapuranga (1) Paleoproterozoic (1) Pirineus Syntaxis (1) Sm-Nd isotopic data (1) Sr-Nd isotopes (1) Tin granites (1) Transamazonian (1) Uruana (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Info:eu-repo/semantics/other (2) Ano 2003 (1) 2001 (4) País Brazil (5) Idioma Inglês (5)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Sm-Nd isotopic data for metabasic rocks in central Brazil: constraints for the timing of mafic magmatism and regional magmatism Anais da ABC (AABC) PIMENTEL,MÁRCIO M.. Tipo: Info:eu-repo/semantics/other Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300038 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 Carbon and strontium isotope record on the vendian-tommotian transition in the NW Argentina Anais da ABC (AABC) SIAL,ALCIDES N.; FERREIRA,VALDEREZ P.; PIMENTEL,MÁRCIO M.; TOSELLI,ALEJANDRO J.; ACENOLAZA,FLORENCIO G.; ALONSO,RICARDO N.; PARADA,MIGUEL A.. Tipo: Info:eu-repo/semantics/other Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300031 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 Sr and Nd isotopic characteristics of 1.77-1.58 Ga rift-related granites and volcanics of the Goiás tin province, central Brazil Anais da ABC (AABC) PIMENTEL,MÁRCIO M.; BOTELHO,NILSON F.. Supracrustal rocks of the Araí Group, together with coeval A-type granites represent a ca. 1.77-1.58 Ga old continental rift in Brazil. Two granite families are identified: the older (1.77 Ga) group forms small undeformed plutons, and the younger granites (ca. 1.58 Ga) constitute larger, deformed plutons. Sr-Nd isotopic data for these rocks indicate that the magmatism is mostly product of re-melting of Paleoproterozoic sialic crust. Initial Sr ratios for both granite families are ca 0.726 and 0.720. Most TDM model ages are between 2.58 and 1.80 Ga. epsilonND(T) values are between +3.6 and -11.9. Araí volcanics are bimodal, with basalts and dacites/rhyolites interlayered with continental sediments. The felsic volcanics show Nd isotopic characteristics which... Tipo: Info:eu-repo/semantics/article Palavras-chave: Sr-Nd isotopes; Paleoproterozoic; Tin granites; Transamazonian. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200010 Registros recuperados: 5 Primeira ... 1 ... Última

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