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Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil

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Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil

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Título Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil
Autor Hartmann, Leo Afraneo
Santos, João Orestes Schneider
McNaughton, Neal Jesse
Vasconcellos, Marcos Antonio Zen
Silva, Luiz Carlos da
Abstract Complex 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.
Contido em Anais da Academia Brasileira de Ciências. Rio de Janeiro. Vol. 72, n. 4 (Dec. 2000), p. 559-572
Assunto Complexo granulítico de Santa Catarina
Datacao shrimp u/pb
Física
Geocronologia
[en] Brazil
[en] Granulites
[en] Santa Catarina granulite complex
[en] SHRIMP
[en] Symplectites
[en] U/Pb geochronology
[en] Zircon
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/37593
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