Actividad ígnea filoniana en los Picos de Europa (N de España): basaltos, lamprófidos y andesitas
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Abstract
En el entorno de los Picos de Europa afloran diques de basaltos, lamprófidos
y andesitas cuya petrología y geoquímica se ha estudiado en este
trabajo. Los basaltos son rocas calcoalcalinas constituidas por plagioclasa,
pseudomorfos de cristales de olivino y de anfíbol, mientras que el lamprófido
es de naturaleza kersantítica y están formados por plagioclasa, augita
y pseudomorfos de olivino. Por otro lado, las andesitas son rocas shoshoníticas
y están formadas por plagioclasa, cuarzo, anfíbol y biotita. La geoquímica
de todas estas rocas es diferente y, por tanto, la afinidad y petrogénesis
de cada una debe ser probablemente diferente.
Dykes of basalt, lamprophyre and andesite have been found in the surroundings of the Picos de Europa massif and its petrology and geochemistry are studied in the present. The basalts are calc-alkaline rocks formed by plagioclase and pseudomorph crystals of olivine and amphibole while the lamprohyre has kersantitic affinity and is formed by plagioclase, augite and pseudomorph crystals of olivine. On the other hand, the andesites have shoshonite features and are formed by plagioclase, quartz, amphibole and biotite. The geochemical composition of all the rocks is different and therefore the character and petrogenesis of each one would probably be different.
Dykes of basalt, lamprophyre and andesite have been found in the surroundings of the Picos de Europa massif and its petrology and geochemistry are studied in the present. The basalts are calc-alkaline rocks formed by plagioclase and pseudomorph crystals of olivine and amphibole while the lamprohyre has kersantitic affinity and is formed by plagioclase, augite and pseudomorph crystals of olivine. On the other hand, the andesites have shoshonite features and are formed by plagioclase, quartz, amphibole and biotite. The geochemical composition of all the rocks is different and therefore the character and petrogenesis of each one would probably be different.







