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Estudios Geologicos
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Geochemistry and age relationships of metamorphosed mafic sills from Sierra de Enmedio and Sierra de Carrascoy (Eastern Betic zone, Southeastern Spain)

Authors: Puga, E.; Torres-Roldán, R. L.;

Geochemistry and age relationships of metamorphosed mafic sills from Sierra de Enmedio and Sierra de Carrascoy (Eastern Betic zone, Southeastern Spain)

Abstract

La frecuente presencia de cuerpos de metabasitas es una característica común de las unidades almágrides, un grupo de unidades tectónicas de la Zona Bética Oriental, de reciente definición, cuya interpretación paleogeográfica es particularmente controvertida. El presente artículo hace especial referencia a la geoquímica (incluyendo datos K/Ar) y relaciones de edad de estas rocas, que se discuten en función de su significado como indicadores del contexto estructural de emplazamiento y evolución post-intrusión. Los análisis (49-55% SiO2 indican una derivación a partir de magmas toleíticos contaminados en medio continental, lo cual viene sugerido por un enriquecimiento en elementos incompatibles tales como Ba, Rb, Th Y K, cuyas abundancias son análogas a las que presentan series bien conocidas de toleítas continentales. En consecuencia, el evento magmático debió originarse en un contexto estructural comparable al de un rift continental. El emplazamiento magmático pudo tener lugar entre el Trías Superior y el Jurásico Medio, estimación que viene limitada por su localización entre capas triásicas y una datación (roca total) K/Ar de 178±4 Ma obtenida sobre una muestra menos alterada. No obstante, edades K/Ar mucho más recientes se obtienen a partir de muestras comunes, reflejando la existencia de un evento metamórfico de edad eocena (o posterior), que fue causante de la recristalización parcial de estas rocas bajo condiciones propias de las facies de esquistos verdes y/o de actinolita-pumpellyita: .Frente a. otros complejos máficos existentes en las Cordilleras Béticas, la evidencia composicional indicativa de contammación continental hace a estas metabasitas más comparables a las de las zonas externas (e. g., las llamadas «ofitas») que a las del Conjunto Nevado-Filábride, lo cual es consistente con propuestas en las que se correlaciona a las unidades almágrides con el Subbético de la provincia de Murcia.

Country
Spain
Related Organizations
Keywords

Bulk-rock geochemistry, K /Ar dating, Datación K/ar, Easter Betic zone, almagride complex, geoquímica de roca total, unidades almágrides, zona Bética Oriental, Instrusiones máficas, Geoquímica de roca total, intrusiones máficas, zona bética oriental, QE1-996.5, mafic intrusives, bulk-rock geochemistry, Geology, eastern Betic zone, datación K/Ar, Almagride complex, datación k/ar, Mafic intrusives, K/Ar dating

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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