New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-Morena tectonic zone

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 data for the Alcáçovas orthogneiss (ca. 540 Ma) tend to favor its involvement in a Cadomian orogeni...

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Bibliographic Details

Published in:	Anais da Academia Brasileira de Ciências Vol. 78; no. 1; pp. 133 - 149
Main Authors:	Cordani, Umberto G, Nutman, Allen P, Andrade, Antonio S, Santos, José F, Azevedo, Maria do Rosário, Mendes, Maria Helena, Pinto, Manuel S
Format:	Journal Article
Language:	English
Published:	Brazil Academia Brasileira de Ciências 01-03-2006
Subjects:	Cadomian orogeny Iberian Massif MULTIDISCIPLINARY SCIENCES Ossa-Morena Zone U-Pb geochronology U-Pb geochronology Ossa-Morena Zone orogênico Cadomiano Maciço Ibérico Cadomian orogeny Zona de Ossa-Morena Iberian Massif geocronologia U-Pb
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