Middle Miocene high-pressure metamorphism and fast exhumation of the Nevado-Filábride Complex, SE Spain |
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| Authors: | V López Sánchez-Vizcaíno D Rubatto M T Gómez-Pugnaire V Trommsdorff & O Müntener |
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| Affiliation: | Departamento de Geología, Universidad de Jaén, E.U. Politécnica de Linares, C/Alfonso X el Sabio, 28, 23700 Linares, Spain,;The Australian National University, Research School of Earth Sciences, Mills Road, 0200 Canberra, Australia,;Departamento de Mineralogía y Petrología, Universidad de Granada, Campus Fuentenueva s/n, 18002 Granada, Spain,;Institute for Mineralogy and Petrography, ETH-Zurich, ETH-Zentrum, CH-8092 Zurich, Switzerland,;Geological Institute, University of Neuchâtel, CH-2007 Neuchâtel, Switzerland |
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| Abstract: | This study provides new constraints on fast cooling and exhumation rates of high-pressure metamorphic rocks in young active mountain belts. Ion microprobe (SHRIMP) U–Pb analysis of zircon in a pyroxenite layer of the Cerro del Almirez ultramafic rocks (Nevado-Filábride Complex, southern Spain) gave an age of 15.0 ± 0.6 Myr (95% c.l.). Mineral inclusions demonstrate that zircon formed close to the high-pressure peak. Combined with previous fission track data, the 15 Myr age suggests high cooling (? 80 °C Myr?1) and exhumation (?1.2 cm yr?1) rates for the unit. The new results indicate that both the Nevado-Filábride Complex and the overlying Alpujárride Complex, with somewhat higher ages and exhumation rates, underwent similar metamorphic evolutions at different times. This implies that the Alpujárride rocks were exhumed when the Nevado-Filábride was subducting and that the same tectonic scenario propagated from one portion of the Betic Cordilleras to another. |
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