Publication: Petrografía y química mineral de los enclaves de granulitas
máficas del volcán de Cofrentes: naturaleza de la corteza inferiorbajo la zona este de la Península Ibérica
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Publication Date
2022
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Sociedad Geológica de España
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Abstract
Las coladas de lava del volcán de Cofrentes transportan una variedad de xenolitos entre los que se encuentran granulitas máficas compuestas por plagioclasa, ortopiroxeno, clinopiroxeno y olivino. La petrografía y química mineral de estos enclaves apunta a un origen ígneo de los protolitos, con posterior reequilibrio en condiciones de facies granulitas. Estas rocas representan acumulados de la corteza inferior a partir de magmas básicos. También poseen características compatibles con fenómenos de reacción con los fundidos alcalinos que las transportan. Estas granulitas son exclusivamente máficas, a diferencia de lo que se observa en otros sectores del Macizo Ibérico, donde abundan los xenolitos granulíticos félsicos.
The lava flows from the Cofrentes volcano carry a variety of xenoliths including mafic granulites composed of plagioclase, orthopyroxene, clinopyroxene and olivine. The petrography and mineral chemistry of these enclaves point to an igneous origin of their protoliths, with subsequent re-equilibration in granulite facies conditions. These rocks represent lower crustal cumulates, resulting from crystallization of basic magmas. They also display textural features compatible with reaction with the host alkaline melts. These granulites are exclusively mafic, unlike what is observed in other sectors of the Iberian Massif, where felsic granulite xenoliths are abundant.
The lava flows from the Cofrentes volcano carry a variety of xenoliths including mafic granulites composed of plagioclase, orthopyroxene, clinopyroxene and olivine. The petrography and mineral chemistry of these enclaves point to an igneous origin of their protoliths, with subsequent re-equilibration in granulite facies conditions. These rocks represent lower crustal cumulates, resulting from crystallization of basic magmas. They also display textural features compatible with reaction with the host alkaline melts. These granulites are exclusively mafic, unlike what is observed in other sectors of the Iberian Massif, where felsic granulite xenoliths are abundant.