New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Academia Brasileira de Ciências
2006
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| _version_ | 1876485214475124736 |
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| author | Allen P. Nutman |
| author_facet | Allen P. Nutman |
| contents | New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone Allen P. Nutman Antonio S. Andrade José F. Santos Maria Do Rosário Azevedo Maria Helena Mendes Manuel S. Pinto Umberto G. Cordani Multidisciplinaria (Ciencias Naturales y Exactas) Ossa Morena Zone Iberian Massif Cadomian orogeny Pb geochronology New SHRIMP U-Pb zircon ages for the Portalegre and Alcáçovas orthogneisses document a complex pre-Variscan history for the Iberian basement in Portugal. The available geochemical and geochronological datafor the Alcáçovas orthogneiss (ca. 540 Ma) tend to favor its involvement in a Cadomian orogenic event. Thisis consistent with the development of an active continental margin setting at the end of the Proterozoic andsupports a Gondwanan provenance for the Iberian crust. On the other hand, the Ordovician emplacementage obtained for the magmatic precursors of the Portalegre orthogneisses (497±10 Ma) provides additionalevidence for the occurrence of rift-related magmatic activity during the Lower Paleozoic. 2006 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32778113 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.1 Vol.78 |
| format | Artículo científico |
| id | redalyc_32778113 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone Allen P. Nutman Multidisciplinaria (Ciencias Naturales y Exactas) Ossa Morena Zone Iberian Massif Cadomian orogeny Pb geochronology New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone Allen P. Nutman Antonio S. Andrade José F. Santos Maria Do Rosário Azevedo Maria Helena Mendes Manuel S. Pinto Umberto G. Cordani Multidisciplinaria (Ciencias Naturales y Exactas) Ossa Morena Zone Iberian Massif Cadomian orogeny Pb geochronology New SHRIMP U-Pb zircon ages for the Portalegre and Alcáçovas orthogneisses document a complex pre-Variscan history for the Iberian basement in Portugal. The available geochemical and geochronological datafor the Alcáçovas orthogneiss (ca. 540 Ma) tend to favor its involvement in a Cadomian orogenic event. Thisis consistent with the development of an active continental margin setting at the end of the Proterozoic andsupports a Gondwanan provenance for the Iberian crust. On the other hand, the Ordovician emplacementage obtained for the magmatic precursors of the Portalegre orthogneisses (497±10 Ma) provides additionalevidence for the occurrence of rift-related magmatic activity during the Lower Paleozoic. 2006 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32778113 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.1 Vol.78 |
| title | New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) Ossa Morena Zone Iberian Massif Cadomian orogeny Pb geochronology |
| url | https://www.redalyc.org/articulo.oa?id=32778113 |