U-Pb evidence for Late Neoarchean crustal reworking in the southern São Francisco Craton (Minas Gerais, Brazil)
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| Natura: | Artículo científico |
| Lingua: | en |
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Academia Brasileira de Ciências
2003
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| _version_ | 1876477038184890368 |
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| author | José C. S. Campos |
| author_facet | José C. S. Campos |
| contents | U-Pb evidence for Late Neoarchean crustal reworking in the southern São Francisco Craton (Minas Gerais, Brazil) José C. S. Campos Maurício A. Carneiro Miguel A. S. Basei Multidisciplinaria (Ciencias Naturales y Exactas) craton Brazil Archean Pb geochronology tectonic evolution The Passa Tempo Metamorphic Complex is one of several metamorphic complexes that form the Archeansialic crust of the southern São Francisco Craton. It encompasses hypersthene-bearing gneissic rocks, withsubordinateNW- or EW-trending mafic-ultramafic bodies and granodioritic to alkali-granitic, weakly foliated,and light-colored granitoids. These granitoids are the product of generalized migmatization that followedgranulite-facies metamorphism. To determine the ages of the granulite-facies metamorphism and granitoidgenesis, we obtained U-Pb ages on zircon extracted from the mesosome and leucosome of the migmatiticgneisses. For the mesosome, a discordia that intercepts Concordia at 2622 ± 18 Ma is interpreted as aminimum age for granulite-facies metamorphism. For the leucosome, the upper intercept of discordia at2599 ± 45 Ma corresponds to migmatization and granitoid genesis. Contemporaneous metamorphism andmagmatism have been documented elsewhere in the São Francisco Craton, especially in the southern portion,demonstrating vast and vigorous reworking of sialic crust by the end of the Neoarchean. 2003 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32775408 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.75 |
| format | Artículo científico |
| id | redalyc_32775408 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | U-Pb evidence for Late Neoarchean crustal reworking in the southern São Francisco Craton (Minas Gerais, Brazil) José C. S. Campos Multidisciplinaria (Ciencias Naturales y Exactas) craton Brazil Archean Pb geochronology tectonic evolution U-Pb evidence for Late Neoarchean crustal reworking in the southern São Francisco Craton (Minas Gerais, Brazil) José C. S. Campos Maurício A. Carneiro Miguel A. S. Basei Multidisciplinaria (Ciencias Naturales y Exactas) craton Brazil Archean Pb geochronology tectonic evolution The Passa Tempo Metamorphic Complex is one of several metamorphic complexes that form the Archeansialic crust of the southern São Francisco Craton. It encompasses hypersthene-bearing gneissic rocks, withsubordinateNW- or EW-trending mafic-ultramafic bodies and granodioritic to alkali-granitic, weakly foliated,and light-colored granitoids. These granitoids are the product of generalized migmatization that followedgranulite-facies metamorphism. To determine the ages of the granulite-facies metamorphism and granitoidgenesis, we obtained U-Pb ages on zircon extracted from the mesosome and leucosome of the migmatiticgneisses. For the mesosome, a discordia that intercepts Concordia at 2622 ± 18 Ma is interpreted as aminimum age for granulite-facies metamorphism. For the leucosome, the upper intercept of discordia at2599 ± 45 Ma corresponds to migmatization and granitoid genesis. Contemporaneous metamorphism andmagmatism have been documented elsewhere in the São Francisco Craton, especially in the southern portion,demonstrating vast and vigorous reworking of sialic crust by the end of the Neoarchean. 2003 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32775408 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.4 Vol.75 |
| title | U-Pb evidence for Late Neoarchean crustal reworking in the southern São Francisco Craton (Minas Gerais, Brazil) |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) craton Brazil Archean Pb geochronology tectonic evolution |
| url | https://www.redalyc.org/articulo.oa?id=32775408 |