Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2000 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/37593 |
Resumo: | 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. |
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Hartmann, Leo AfraneoSantos, João Orestes SchneiderMcNaughton, Neal JesseVasconcellos, Marcos Antonio ZenSilva, Luiz Carlos da2012-03-20T01:21:02Z20000001-3765http://hdl.handle.net/10183/37593000280544Complex 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.application/pdfengAnais da Academia Brasileira de Ciências. Rio de Janeiro. Vol. 72, n. 4 (Dec. 2000), p. 559-572FísicaDatação shrimp u/pbGeocronologiaComplexo granulítico de Santa CatarinaGranulitesSHRIMPU/Pb geochronologySanta Catarina granulite complexBrazilSymplectitesZirconIon microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazilinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000280544.pdf000280544.pdfTexto completo (inglês)application/pdf581023http://www.lume.ufrgs.br/bitstream/10183/37593/1/000280544.pdf42900b79f1cea04eeb533d892c4860f5MD51TEXT000280544.pdf.txt000280544.pdf.txtExtracted Texttext/plain41669http://www.lume.ufrgs.br/bitstream/10183/37593/2/000280544.pdf.txt9f113c3f90c023f0d368a3e853526366MD52THUMBNAIL000280544.pdf.jpg000280544.pdf.jpgGenerated Thumbnailimage/jpeg1618http://www.lume.ufrgs.br/bitstream/10183/37593/3/000280544.pdf.jpgdf7b57f2a8e2f695ee7e8ccb572bf561MD5310183/375932021-11-20 06:10:45.004449oai:www.lume.ufrgs.br:10183/37593Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-11-20T08:10:45Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
title |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
spellingShingle |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil Hartmann, Leo Afraneo Física Datação shrimp u/pb Geocronologia Complexo granulítico de Santa Catarina Granulites SHRIMP U/Pb geochronology Santa Catarina granulite complex Brazil Symplectites Zircon |
title_short |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
title_full |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
title_fullStr |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
title_full_unstemmed |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
title_sort |
Ion microproble (SHRIMP) dates complex granulite from Santa Catarina, southern Brazil |
author |
Hartmann, Leo Afraneo |
author_facet |
Hartmann, Leo Afraneo Santos, João Orestes Schneider McNaughton, Neal Jesse Vasconcellos, Marcos Antonio Zen Silva, Luiz Carlos da |
author_role |
author |
author2 |
Santos, João Orestes Schneider McNaughton, Neal Jesse Vasconcellos, Marcos Antonio Zen Silva, Luiz Carlos da |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Hartmann, Leo Afraneo Santos, João Orestes Schneider McNaughton, Neal Jesse Vasconcellos, Marcos Antonio Zen Silva, Luiz Carlos da |
dc.subject.por.fl_str_mv |
Física Datação shrimp u/pb Geocronologia Complexo granulítico de Santa Catarina |
topic |
Física Datação shrimp u/pb Geocronologia Complexo granulítico de Santa Catarina Granulites SHRIMP U/Pb geochronology Santa Catarina granulite complex Brazil Symplectites Zircon |
dc.subject.eng.fl_str_mv |
Granulites SHRIMP U/Pb geochronology Santa Catarina granulite complex Brazil Symplectites Zircon |
description |
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. |
publishDate |
2000 |
dc.date.issued.fl_str_mv |
2000 |
dc.date.accessioned.fl_str_mv |
2012-03-20T01:21:02Z |
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http://hdl.handle.net/10183/37593 |
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0001-3765 |
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000280544 |
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http://hdl.handle.net/10183/37593 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Anais da Academia Brasileira de Ciências. Rio de Janeiro. Vol. 72, n. 4 (Dec. 2000), p. 559-572 |
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openAccess |
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