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Article

Tectonometamorphic Evolution of the Migmatitic Paragneisses of the Filali Unit (Internal Rif, Morocco)

by
Abdelkhaleq Afiri
1,*,
Abderrahim Essaifi
2,
Ali Charroud
3,
Mourad Aqnouy
4,
Kamal Abdelrahman
5,
Amar Alali
4 and
Mohamed Abioui
6,7,*
1
Applied Geology Research Laboratory, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, Errachidia 52000, Morocco
2
Lithosphere Dynamics and Resource Genesis Laboratory “DLGR” (Unit Associated with CNRST, URAC 43), Department of Geology, Faculty of Sciences-Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco
3
Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, Errachidia 52000, Morocco
4
Applied Geology Research Laboratory, Applied Geology and Remote Sensing Research Team, Department of Geosciences, Faculty of Sciences and Techniques, Moulay Ismail University of Meknes, Errachidia 52000, Morocco
5
Department of Geology & Geophysics, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
6
Geosciences, Environment and Geomatics Laboratory (GEG), Department of Earth Sciences, Faculty of Sciences, Ibnou Zohr University, Agadir 80000, Morocco
7
MARE—Marine and Environmental Sciences Centre-Sedimentary Geology Group, Department of Earth Sciences, Faculty of Sciences and Technology, University of Coimbra, 3030790 Coimbra, Portugal
*
Authors to whom correspondence should be addressed.
Minerals 2023, 13(4), 484; https://doi.org/10.3390/min13040484
Submission received: 26 February 2023 / Revised: 25 March 2023 / Accepted: 27 March 2023 / Published: 30 March 2023
(This article belongs to the Special Issue Mineralogy and Geochemistry of Mafic-Ultramafic Assemblages and Associated Ore Deposits)
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Abstract

A lithosphere-scale extensional shear zone juxtaposes an underlying sub-continental peridotite body and overlying migmatitic paragneisses of the Filali unit in the Beni Bousera massif (Internal Rif, Morocco). Three stages are recognized in the metamorphic evolution of the aluminous paragneiss, marked by the chemical zoning of garnet porphyroblasts and the evolution of associated mineral assemblages characterized by the presence of kyanite and rutile (M1), sillimanite, k-feldspar and melt (M2), and cordierite (M3). Phase-equilibrium modeling (pseudosections) and multi-equilibrium thermobarometry point to P-T conditions of 7 kbar 750 °C and 3.5 kbar 685 °C for the M2 and M3 stages, respectively. M1 conditions of 9.3 kbar 660 °C were inferred using modeling after the reintegration of melt lost during M2 into the bulk composition. Published geochronological data suggest a Variscan age (250–340 Ma) for the M1 event, whereas M2 and M3 are Oligo-Miocene and related to the Alpine orogeny. The recorded sub-isothermal decompression is related to significant crustal attenuation in the Oligo-Miocene and is responsible for the juxtaposition of the hot asthenospheric mantle and the crustal units, causing the melting of the paragneiss. The exhumation of the gneisses by crustal extension is associated with the westward retreat of an Alpine subduction (slab rollback).
Keywords: migmatitic paragneisses; sub-isothermal decompression; pseudosections; partial melting; melt reintegration; Rif belt migmatitic paragneisses; sub-isothermal decompression; pseudosections; partial melting; melt reintegration; Rif belt

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MDPI and ACS Style

Afiri, A.; Essaifi, A.; Charroud, A.; Aqnouy, M.; Abdelrahman, K.; Alali, A.; Abioui, M. Tectonometamorphic Evolution of the Migmatitic Paragneisses of the Filali Unit (Internal Rif, Morocco). Minerals 2023, 13, 484. https://doi.org/10.3390/min13040484

AMA Style

Afiri A, Essaifi A, Charroud A, Aqnouy M, Abdelrahman K, Alali A, Abioui M. Tectonometamorphic Evolution of the Migmatitic Paragneisses of the Filali Unit (Internal Rif, Morocco). Minerals. 2023; 13(4):484. https://doi.org/10.3390/min13040484

Chicago/Turabian Style

Afiri, Abdelkhaleq, Abderrahim Essaifi, Ali Charroud, Mourad Aqnouy, Kamal Abdelrahman, Amar Alali, and Mohamed Abioui. 2023. "Tectonometamorphic Evolution of the Migmatitic Paragneisses of the Filali Unit (Internal Rif, Morocco)" Minerals 13, no. 4: 484. https://doi.org/10.3390/min13040484

APA Style

Afiri, A., Essaifi, A., Charroud, A., Aqnouy, M., Abdelrahman, K., Alali, A., & Abioui, M. (2023). Tectonometamorphic Evolution of the Migmatitic Paragneisses of the Filali Unit (Internal Rif, Morocco). Minerals, 13(4), 484. https://doi.org/10.3390/min13040484

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