Petrología y geoquímica de los xenolitos del manto en los volcanes del Campo de Calatrava (Ciudad Real, España)
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2024
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24/11/2023
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Universidad Complutense de Madrid
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Abstract
La presente Tesis doctoral recoge la caracterización petrográfica y geoquímica del manto subcontinental litosférico (MSCL) bajo el centro de la Península Ibérica a partir del estudio de los xenolitos peridotíticos y piroxeníticos del Campo Volcánico de Calatrava (CVC). Su caracterización geoquímica se ha llevado a cabo gracias a la química de roca total y de sus principales minerales constituyentes, tanto de los elementos mayores como los trazas. También se ha podido analizar su composición isotópica (Sr-Nd) para precisar la naturaleza del MSCL muestreado en el centro de Iberia. En la Región Volcánica Central de España, como la denominó Hernández-Pacheco en 1932, caracterizada por su volcanismo básico alcalino y ultraalcalino, y su condición de campo volcánico monogenético, solo se han encontrado xenolitos procedentes del MSCL en seis de sus más de 260 centros volcánicos. Además de los xenolitos ultramáficos en los que se centra esta Tesis, los fundidos alcalinos del CVC también transportaron una rica y variada carga cristalina que consiste en megacristales de clinopiroxeno, anfíbol y flogopita, de acumulados de grano fino clinopiroxeníticos (y glimmeríticos) y una compleja población de macrocristales y fenocristales (clinopiroxeno verde e incoloro, anfíbol, flogopita y olivino)...
This PhD Thesis reports petrographical, mineralogical and geochemical characterization of the subcontinental lithospheric mantle (SCLM) under the central parts of the Iberian Peninsula by the study of ultramafic xenoliths of the Calatrava Volcanic Field (CVF). The geochemical characterization has been carried out by whole rock analyses and the main mafic minerals chemical composition, both major and traces elements. It has also been possible to analyze whole-rock isotopic compositions (Sr-Nd isotopic signatures) to improve the sampled SCLM nature from the center of Iberia.The Región Volcánica de España (named by Hernández-Pacheco, 1932) is characterized by being a monogenetic volcanic field of basic alkaline and ultra-alkaline magmatism. Peridotite xenoliths have been only found in six of the more than 260 volcanic centres of the CVF. The CVF alkaline melts also transported a rich, varied and complex crystal cargo consisting of clinopyroxene, amphibole and phlogopite megacrysts, fine-grained aggregates of clinopyroxenites, with igneous textures and zoned clinopyroxene crystals, and a complex population of phenocrysts (green and colourless clinopyroxene, amphibole, phlogopite, and olivine)...
This PhD Thesis reports petrographical, mineralogical and geochemical characterization of the subcontinental lithospheric mantle (SCLM) under the central parts of the Iberian Peninsula by the study of ultramafic xenoliths of the Calatrava Volcanic Field (CVF). The geochemical characterization has been carried out by whole rock analyses and the main mafic minerals chemical composition, both major and traces elements. It has also been possible to analyze whole-rock isotopic compositions (Sr-Nd isotopic signatures) to improve the sampled SCLM nature from the center of Iberia.The Región Volcánica de España (named by Hernández-Pacheco, 1932) is characterized by being a monogenetic volcanic field of basic alkaline and ultra-alkaline magmatism. Peridotite xenoliths have been only found in six of the more than 260 volcanic centres of the CVF. The CVF alkaline melts also transported a rich, varied and complex crystal cargo consisting of clinopyroxene, amphibole and phlogopite megacrysts, fine-grained aggregates of clinopyroxenites, with igneous textures and zoned clinopyroxene crystals, and a complex population of phenocrysts (green and colourless clinopyroxene, amphibole, phlogopite, and olivine)...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Geológicas, leída el 24/11/2023