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Arc-related high-K magmatism in the Ceuta Peninsula (Internal Rif, Spain): discovery and consequences

Published online by Cambridge University Press:  30 October 2018

Emmanuelle Homonnay*
Affiliation:
Géoazur, Université Côte d’Azur, CNRS, IRD, Observatoire de la Côte d’Azur, UMR 7329, 250, rue Albert-Einstein, 06560 Sophia Antipolis, France
Jean-Marc Lardeaux
Affiliation:
Géoazur, Université Côte d’Azur, CNRS, IRD, Observatoire de la Côte d’Azur, UMR 7329, 250, rue Albert-Einstein, 06560 Sophia Antipolis, France Czech Geological Survey, Centre for Lithospheric Research, Klárov 3, 118 21 Prague 1, Czech Republic
Michel Corsini
Affiliation:
Géoazur, Université Côte d’Azur, CNRS, IRD, Observatoire de la Côte d’Azur, UMR 7329, 250, rue Albert-Einstein, 06560 Sophia Antipolis, France
Asmae El Bakili
Affiliation:
Géoazur, Université Côte d’Azur, CNRS, IRD, Observatoire de la Côte d’Azur, UMR 7329, 250, rue Albert-Einstein, 06560 Sophia Antipolis, France Faculté des Sciences de Rabat, Université de Mohammed V, 4 avenue Ibn Batouta, Rabat, Morocco
Delphine Bosch
Affiliation:
Géosciences Montpellier, UMR UM-CNRS 5243, Université Montpellier, CC 060, place Eugène Bataillon, 34095 Montpellier cedex 5, France
Olivier Bruguier
Affiliation:
Géosciences Montpellier, UMR UM-CNRS 5243, Université Montpellier, CC 060, place Eugène Bataillon, 34095 Montpellier cedex 5, France
Mohamed Ouazzani-Touhami
Affiliation:
Département de Géologie, Université Abdelmalek Esaadi, 93003 Tetouan, Morocco
*
Author for correspondence: Emmanuelle Homonnay, Email: homonnay@geoazur.unice.fr

Abstract

We document the occurrence of micro-diorite magmatic sills, with magmatic enclaves, in the Ceuta Peninsula within metapelites from the Lower Sebtides units (Internal Rif). All magmatic rocks show a primary magmatic mineralogy and geochemical signature diagnostic for high-K calc-alkaline to shoshonitic island arc magmatism. Moreover, these rocks are significantly affected by secondary metamorphic transformations under greenschist- to amphibolite-facies conditions, regionally dated at c. 21 Ma. Geometric relationships between the sills and the main regional foliation, developed under intermediate-pressure granulite-facies conditions at c. 28 Ma, demonstrate that the sills emplaced during the late stage of this main tectonic event. New U–Pb in situ analyses of monazite performed on the micro-diorite sills provide an age of 20.64 ± 0.19 Ma, coherent with this chronological framework and interpreted as the age of greenschist-facies re-equilibration. The discovery of pre-Miocene high-K calc-alkaline to shoshonitic arc-related magmatism is clearly consistent with the subduction context proposed for the Alboran Basin evolution, according to geophysical investigations. In this framework, the Lower Sebtides units could be considered as part of the upper plate of the subduction system, while the Upper Sebtides must be regarded as the lower subducted plate.

Type
Original Article
Copyright
© Cambridge University Press 2018 

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