Publication: Geología y geoquímica del granitoide pre-Varisco de Puente de Selce (Antiforme del Narcea, Asturias)
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Publication Date
1996
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Sociedad Geológica de España
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Abstract
El granitoide de Puente de Selce es un cuerpo intrusivo en las Pizarras del Narcea de edad proterozoica. Su edad se interpreta como pre-varisca. La intrusión de Puente de Selce está formada por tonalitas y grano dioritas de tipo 1 con carácter calcoalcalino rico en K, que han evolucionado por
cristalización fraccionada de anfíbol, biotita, plagioc1asa y apatito. Los contenidos en elementos mayores y trazas y sus tendencias de variación son propias de granitoides generados en arcos continentales de tipo andino. La fusión parcial de anfibolitas de composición andesítica en la corteza inferior a temperaturas superiores a 850°C se propone como el mecanismo más probable para la generación de
estas rocas. Está afectado heterogéneamente por todas la fases de deformación variscas descritas en este sector, especialmente por la segunda fase de deformación que le confiere texturas neísicas, miloníticas y filoníticas rodeando lentes preservadas de dicha deformación
The Puente de Selce granitoid intruded the Proterozoic Narcea slates and was deformed heterogeneously during Variscan times. Gneisic, mylonitic and phyllonitic textures surround lenses with less prominent deformation. The age of this rocks is interpreted to be pre-variscan. The Puente de Selce granitoid is formed by I-type high-K calc-alkaline tonalites and granodiorites which have evolved by fractionation of plagioc1ase, biotite, amphibole and apatite. Major and trace element contents and variation trends are characteristic of granitoids generated in an Andean-type continental arc setting. Melting of amphibolitic rocks of andesitic composition in the lower crust is proposed as the most likely mechanism for the generation of these rocks
The Puente de Selce granitoid intruded the Proterozoic Narcea slates and was deformed heterogeneously during Variscan times. Gneisic, mylonitic and phyllonitic textures surround lenses with less prominent deformation. The age of this rocks is interpreted to be pre-variscan. The Puente de Selce granitoid is formed by I-type high-K calc-alkaline tonalites and granodiorites which have evolved by fractionation of plagioc1ase, biotite, amphibole and apatite. Major and trace element contents and variation trends are characteristic of granitoids generated in an Andean-type continental arc setting. Melting of amphibolitic rocks of andesitic composition in the lower crust is proposed as the most likely mechanism for the generation of these rocks