Petrogénesis de las rocas magmáticas hercínicas del Macizo de la Albera (Pirineos Orientales)
- Autores: Miquel Vilà, Pere Enrique Gisbert, Montserrat Liesa i Torre-Marín, Christian Pin
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 137-140
- Idioma: español
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Resumen
From field, petrological and geochemical data the petrogenesis of the Hercynian magmatic rocks from the Albera Massif (Oriental Pyrenees) is approached. At the study area the Hercynian magmatism is represented by the calc-alkaline granitoids of La jonquera, by the leucogranitic pluton of El Castellar, by the small mafic complexes and by the stocks of anatectic leucogranites. These magmatic rocks were formed contemporaneously (around 280 Ma, according to whole rock Rb/Sr geochronology) and they define three series resulting from the crystallization of three magmas of different composition: one mafic, one granodioritic and one leucogranitic. Petrological and geochemical data suggest that the leucogranitic magma was derived from partial melting of similar metasediments and gneisses that actually crop out in the massif, the granodioritic magma was formed by partial melting of lower crustal metatonalites and the mafic magma was developed from partial melting of the mantle. The Hercynian low pressure-high temperature metamorphism and the Hercynian magmatism in the Pyrenees were probably related to a thermal anomaly resulting from the activity of a paleo-Tethys subduction zone.
