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Petrography and geochemistry of late- to post-Variscan vaugnerite series rocks and calc-alkaline lamprophyres within a cordierite-bearing monzogranite (the Sierra Bermeja Pluton, southern Iberian Massif).
Errandonea, Jon (Universidad del País Vasco. Departamento de Minerología y Petrología)
Sarrionandia Eguidazu, Fernando (Universidad del País Vasco. Departamento de Geodinámica)
Carracedo-Sánchez, Manuel (Department of Mineralogy and Petrology, Faculty of Science and Technology, University of the Basque Country (UPV/EHU))
Gil Ibarguchi, José Ignacio (Universidad del País Vasco. Departamento de Minerología y Petrología)
Eguiluz Alarcón, Luis (Universidad del País Vasco. Departamento de Geodinámica)

Fecha: 2018
Resumen: The Sierra Bermeja Pluton (southern Central Iberian Zone, Iberian Massif) is a late-Variscan intrusive constituted by cordierite-bearing peraluminous monzogranites. Detailed field mapping has allowed to disclose the presence of several NE–SW trending longitudinal composite bodies, formed by either aphanitic or phaneritic mesocratic rocks. According to their petrography and geochemistry these rocks are categorised as calc-alkaline lamprophyres and vaugnerite series rocks. Their primary mineralogy is characterised by variable amounts of plagioclase, amphibole, clinopyroxene, biotite, K-feldspar, quartz and apatite. Broadly, they show low SiO2 content (49–56wt. %), and high MgO+FeOt (10–17wt. %), K2O (3–5wt. %), Ba (963–2095ppm), Sr (401–1149ppm) and Cr (87–330ppm) contents. Field scale observations suggest that vaugneritic rocks and lamprophyres would constitute two independent magma pulses. Vaugneritic dioritoids intruded as syn-plutonic dykes, whereas lamprophyres were emplaced after the almost complete consolidation of the host monzogranites. In this way, vaugnerite series rocks would be an evidence for the contemporaneity of crustal- and mantle-melting processes during a late-Variscan stage, while lamprophyres would represent the ending of this stage.
Derechos: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l’obra i la creació d’obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l’obra original i es reconegui l’autoria de l’obra original. Creative Commons
Lengua: Anglès.
Documento: article ; recerca ; publishedVersion
Materia: Calc-alkaline lamprophyre ; Vaugnerite series ; Redwitzite ; Cordierite-bearing granite ; Iberian Massif
Publicado en: Geologica acta, Vol. 16 Núm. 3 (September 2018) , p. 237-255 (Articles) , ISSN 1696-5728

Adreça original: https://www.raco.cat/index.php/GeologicaActa/article/view/341234
DOI: 10.1344/GeologicaActa2018.16.3.1


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