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dc.contributor.authorHartmann, Leo Afraneopt_BR
dc.contributor.authorSantos, João Orestes Schneiderpt_BR
dc.contributor.authorMcNaughton, Neal Jessept_BR
dc.contributor.authorVasconcellos, Marcos Antonio Zenpt_BR
dc.contributor.authorSilva, Luiz Carlos dapt_BR
dc.date.accessioned2012-03-20T01:21:02Zpt_BR
dc.date.issued2000pt_BR
dc.identifier.issn0001-3765pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/37593pt_BR
dc.description.abstractComplex polymetamorphic granulites have been dated in the Santa Catarina granulite complex of southern Brazil through SHRIMP study of zircon. This complex is dominated by intermediate-acid plutonic rocks and contains small volumes of mafic and ultramafic rocks, and minor quartzite and banded iron formation. Porphyroblasts of orthopyroxene, clinopyroxene and plagioclase in mafic and acid rocks are interpreted as magmatic remnants in a volumetrically dominant granoblastic aggregate (M1) of the same minerals and hornblende. Hornblende formed during a laterM2 metamorphic event constitutes rims around pyroxene, but the hornblende is also rimmed by granoblastic simplectites of orthopyroxene, clinopyroxene, hornblende and plagioclase in a second granulite facies event (M3). Chlorite and epidote occur in shear zones (M4). This granulite terrain is part of a Neoproterozoic craton, because it was little affected by the Brasiliano Cycle. The two granulite-facies events (M1 andM3) are dated by U/Pb zircon SHRIMP at about 2.68 and 2.17 Ga, while the magmatic protoliths formed at about 2.72 Ga. The amphibolite facies event (M2) probably occurred close to the 2.17 Ga granulitic metamorphism.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofAnais da Academia Brasileira de Ciências. Rio de Janeiro. Vol. 72, n. 4 (Dec. 2000), p. 559-572pt_BR
dc.rightsOpen Accessen
dc.subjectFísicapt_BR
dc.subjectGranulitesen
dc.subjectDatação shrimp u/pbpt_BR
dc.subjectSHRIMPen
dc.subjectU/Pb geochronologyen
dc.subjectGeocronologiapt_BR
dc.subjectSanta Catarina granulite complexen
dc.subjectComplexo granulítico de Santa Catarinapt_BR
dc.subjectBrazilen
dc.subjectSymplectitesen
dc.subjectZirconen
dc.titleIon microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazilpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000280544pt_BR
dc.type.originNacionalpt_BR


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