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	Provedor de dados Anais da ABC (AABC) (2) Autor Hartmann,Léo A. (2) Leite,Jayme A.D. (2) Bastos-Neto,Artur C. (1) Jelinek,Andréa R. (1) McNaughton,Neal J. (1) Mcnaughton,Neal J. (1) Porcher,Carla C. (1) Santos,João O.S. (1) Mais... Palavra-chave Encantadas Complex (1) Fluorite (1) Geochronology (1) Metamorphism (1) Pedras Grandes Suite (1) SHRIMP (1) Trans-Amazonian Cycle (1) Ultramafic amphibolite (1) Zircon (1) Zircon geochronology (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2005 (1) 2003 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última SHRIMP U-Pb zircon dating of Pedras Grandes Suite, southern Santa Catarina State, Brazil Anais da ABC (AABC) Jelinek,Andréa R.; Bastos-Neto,Artur C.; Leite,Jayme A.D.; Hartmann,Léo A.; McNaughton,Neal J.. Two major magmatic pulses of the granitic Florianópolis Batholith in Santa Catarina State, southern Brazil, occurred between 613±5Ma and 595±5 Ma, during the Neoproterozoic Brasiliano Cycle. These ages were obtained by U-Pb isotopic determinations with the sensitive high mass-resolution ion microprobe on igneous zircons from Pedras Grandes Suite in Santa Catarina State. Euhedral zircons remained unaltered close to a fluorite vein deposited at 180?C or more. These ages suggest a northern limit for the Pedras Grandes Suite, explaining the spatial relationship between the fluorite veins and the source rock. Tipo: Info:eu-repo/semantics/article Palavras-chave: SHRIMP; Pedras Grandes Suite; Zircon; Geochronology; Fluorite. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000100010 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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