Pre‐Alpine discordant granitic dikes in the metamorphic core of the Betic Cordillera: tectonic implications |
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| Authors: | Antonio Sánchez‐Navas Antonio García‐Casco Agustín Martín‐Algarra |
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| Affiliation: | 1. Departamento de Mineralogía y Petrología, I.A.C.T. Universidad de Granada, C.S.I.C., , Granada, E‐18071 Spain;2. Departamento de Estratigrafía y Paleontología, I.A.C.T. Universidad de Granada, , Granada, E‐18071 Spain |
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| Abstract: | Pegmatite dikes bearing andalusite crosscut foliation S2 in Alpujarride gneisses and schists. Post‐S2 andalusite is transposed by a foliation S3, defined by fibrolite, which affects the dikes. The dikes represent highly differentiated granitic magmas with low REE and Zr contents and a positive Eu anomaly. U‐Pb SHRIMP dating of magmatic zircons provided Pan‐African ages (cores) and late Variscan ages (rims). However, U‐rich rims also provided metamorphic Alpine ages, supporting a polyorogenic tectonometamorphic history for pre‐Mesozoic Alpujarride rocks. |
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