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	Provedor de dados Anais da ABC (AABC) (2) Autor Hartmann,Léo A. (2) Santos,João O.S. (2) Leite,Jayme A.D. (1) Liu,Dunyi (1) Massonne,Hans-Joachim (1) Mcnaughton,Neal J. (1) Porcher,Carla C. (1) Wang,Yenbin (1) Mais... Palavra-chave Zircon geochronology (2) Encantadas Complex (1) Metamorphism (1) Paleoproterozoic (1) Protolith age (1) SHRIMP (1) Santa Maria Chico Granulitic Complex (1) Trans-Amazonian Cycle (1) Ultramafic amphibolite (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2008 (1) 2003 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Protolith age of Santa Maria Chico granulites dated on zircons from an associated amphibolite-facies granodiorite in southernmost Brazil Anais da ABC (AABC) Hartmann,Léo A.; Liu,Dunyi; Wang,Yenbin; Massonne,Hans-Joachim; Santos,João O.S.. U-Pb dating of zircon was undertaken with the Beijing SHRIMP II (sensitive high resolution ion microprobe) on anamphibolite facies granodiorite and an almandine-albite granulite from the Santa Maria Chico Granulitic Complex, southern Brazilian Shield. This work was also done to unravel protolith ages which are often hidden in the array of partly reset data. The obtained metamorphic ages of the granodiorite gneiss and the granulite are 2035 ± 9 Ma and 2006 ± 3 Ma, respectively. These data are within the range of metamorphic ages determined in previous studies (2022 ± 18 Ma and 2031 ± 40 Ma). However, protolith ages for the granodiorite (2366 ± 8 Ma) and the granulite (2489 ± 6 Ma) were obtained which are outside the previously recognized range (>... Tipo: Info:eu-repo/semantics/article Palavras-chave: Protolith age; Paleoproterozoic; Zircon geochronology; Santa Maria Chico Granulitic Complex; SHRIMP. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300014 Metamorphic evolution and U-Pb zircon SHRIMP geochronology of the Belizário ultramafic amphibolite, Encantadas Complex, southernmost Brazil Anais da ABC (AABC) Hartmann,Léo A.; Santos,João O.S.; Leite,Jayme A.D.; Porcher,Carla C.; Mcnaughton,Neal J.. The integrated investigation of metamorphism and zircon U-Pb SHRIMP geochronology of the Belizário ultramafic amphibolite from southernmost Brazil leads to a better understanding of the processes involved in the generation of the Encantadas Complex. Magmatic evidence of the magnesian basalt or pyroxenite protolith is only preserved in cores of zircon crystals, which are dated at 2257 ± 12 Ma. Amphibolite facies metamorphism M1 formed voluminous hornblende in the investigated rock possibly at 1989 ± 21 Ma. This ultramafic rock was re-metamorphosed at 702±21 Ma during a greenschist facies eventM2; the assemblage actinolite + oligoclase + microcline + epidote + titanite + monazite formed by alteration of hornblende. The metamorphic events are probably related... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ultramafic amphibolite; Zircon geochronology; Encantadas Complex; Trans-Amazonian Cycle; Metamorphism. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000300010 Registros recuperados: 2 Primeira ... 1 ... Última

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