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 Mineralogía y Petrología)
Sarrionandia Eguidazu, Fernando (Universidad del País Vasco. Departamento de Geología)
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 Mineralogía y Petrología)
Eguiluz Alarcón, Luis (Universidad del País Vasco. Departamento de Geología)

Data:	2018
Resum:	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.
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Calc-alkaline lamprophyre ; Vaugnerite series ; Redwitzite ; Cordierite-bearing granite ; Iberian Massif
Publicat a:	Geologica acta, Vol. 16 Núm. 3 (September 2018) , p. 237-255 (Articles) , ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/341234
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2018.16.3.1
DOI: 10.1344/GeologicaActa2018.16.3.1

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