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dc.contributor.authorCambeses Torres, Aitor
dc.contributor.authorMolina Palma, José Francisco 
dc.contributor.authorMorales López, Irene
dc.contributor.authorGonzález Montero, María Del Pilar 
dc.contributor.authorBea Barredo, Fernando
dc.identifier.citationCambeses, A.; Molina, J.F.; Morales, I.; Lázaro, C.; Moreno, J.A.; Montero, P.; Bea, F. Compositional Evolution of the Variscan Intra-Orogenic Extensional Magmatism in the Valencia del Ventoso Plutonic Complex, Ossa-Morena Zone (SW Iberia): A View from Amphibole Compositional Relationships. Minerals 2021, 11, 431.
dc.description.abstractThe Ossa-Morena Zone (OMZ), SW Iberia, has numerous Lower Carboniferous compositionally zoned plutons that formed in a Variscan intra-orogenic extensional setting. This magmatism shows a wide compositional variation comprising alkaline, transitional, and calc-alkaline suites. The calc-alkaline suite was produced by hybridization of alkaline magmas with felsic melts generated by crustal anatexis related to the intrusion of mafic magmas in the middle crust. In this work, we present a textural and mineralogical study of the Variscan Valencia del Ventoso main pluton from the OMZ to track the compositional evolution of magmas during hybridization using constraints from amphibole compositions and to determine the P-T conditions of emplacement using amphibolebased thermobarometry. This pluton exhibits reverse zoning with an inner facies containing alkaline dolerites, gabbros, and quartz diorites, an intermediate facies with transitional diorites, and an outer facies with calc-alkaline quartz diorites to monzogranites. Magmas from the intermediate and border facies crystallized under oxidizing conditions at relatively low temperatures (range: 640–760 ◦C) and ca. 280–300 MPa, implying near H2O-saturated conditions. These rock facies show mineralogical evidence of hybridization between alkaline to mildly alkalic and calc-alkaline magmas. The former is inferred from the occurrence of antecrysts of labradorite-andesine, high-Ti pargasite-hastingsite, and biotite with deficiency in tetrahedral-site occupancy, a distinctive feature of biotite from the inner facies alkaline dolerites. This contrasts with later crystallization from the calc-alkaline magma of andesine-oligoclase, low-Ti magnesiohornblende-edenite, and biotite with full tetrahedral-site occupancy. Constraints from amphibole-melt compositional relationships in antecrystic high-Ti amphibole suggest that the alkaline magmatic component could have a high- to ultra-K affinity.es_ES
dc.description.sponsorshipMinisterio de Economía y Competitividad (Gobierno de España), CGL2017-84469-Pes_ES
dc.rightsAtribución 3.0 España*
dc.subjectAmphibole compositional relationshipses_ES
dc.subjectAmphibole-plagioclase thermobarometryes_ES
dc.subjectPostcollisional magmatismes_ES
dc.subjectMagma mixing and hybridizationes_ES
dc.subjectOssa-Morena Zonees_ES
dc.subjectVariscan orogenes_ES
dc.titleCompositional Evolution of the Variscan Intra-Orogenic Extensional Magmatism in the Valencia del Ventoso Plutonic Complex, Ossa-Morena Zone (SW Iberia): A View from Amphibole Compositional Relationshipses_ES

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Atribución 3.0 España
Except where otherwise noted, this item's license is described as Atribución 3.0 España