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Journal of Earth Science > 2025 > Accepted Manuscript

Oumaima ESSOUALEH, Abdelmouhsine AGHZER, Abdelkhaleq AFIRI. Isobaric prograde path of the migmatized Filali paragneiss constrained by phase equilibria modelling at the hanging-wall of an extensional detachment from the Lower Sebtides (Internal Rif belt, Northern Morocco). Journal of Earth Science. doi: 10.1007/s12583-025-0327-x

Citation:

Oumaima ESSOUALEH, Abdelmouhsine AGHZER, Abdelkhaleq AFIRI. Isobaric prograde path of the migmatized Filali paragneiss constrained by phase equilibria modelling at the hanging-wall of an extensional detachment from the Lower Sebtides (Internal Rif belt, Northern Morocco). Journal of Earth Science. doi: 10.1007/s12583-025-0327-x

Oumaima ESSOUALEH, Abdelmouhsine AGHZER, Abdelkhaleq AFIRI. Isobaric prograde path of the migmatized Filali paragneiss constrained by phase equilibria modelling at the hanging-wall of an extensional detachment from the Lower Sebtides (Internal Rif belt, Northern Morocco). Journal of Earth Science. doi: 10.1007/s12583-025-0327-x

Citation:

Oumaima ESSOUALEH, Abdelmouhsine AGHZER, Abdelkhaleq AFIRI. Isobaric prograde path of the migmatized Filali paragneiss constrained by phase equilibria modelling at the hanging-wall of an extensional detachment from the Lower Sebtides (Internal Rif belt, Northern Morocco). Journal of Earth Science. doi: 10.1007/s12583-025-0327-x

Isobaric prograde path of the migmatized Filali paragneiss constrained by phase equilibria modelling at the hanging-wall of an extensional detachment from the Lower Sebtides (Internal Rif belt, Northern Morocco)

doi: 10.1007/s12583-025-0327-x

a Department of Geology, Faculty of Sciences, University of Chouaib Doukkali, El jadida, Morocco 24000;
b Department of Geology, Faculty of Sciences and techniques, University of Moulay Smail, Errachidia, Morocco 52000

Available Online: 12 Jul 2025

Abstract

The Filali unit corresponds to a Barrovian crustal section consisting of micaschists at the top that evolve into migmatitic paragneiss at the base. The latter are separated from the overlying micaschists and the underlying Beni Bousera complex (peridotites and an extremely thinned HP granulitic cover) by extensional detachments. Three metamorphic stages are distinguished in the Filali migmatites:a prograde kyanite-bearing metamorphic assemblage (M1), a syn-thermal peak sillimanite-bearing assemblage (M2) and a retrograde cordierite-bearing assemblage (M3). Phase equilibrium modelling constrains P-T conditions of 6.75-7.25 Kbar and 510-550℃, 6.8-8.2 kbar and 755-805℃ and 3-5.25 and 600-765℃ for M1, M2 and M3 stages, respectively, indicating a clockwise P-T path. The early two stage of this trajectory corresponds to an isobaric heating of the base of the Filali unit, related to their tectonic juxtaposition against the underlying Beni Bousera complex through an extensional detachment. This prograde evolution gave rise to anatexis of the Filali gneiss through dehydration melting of muscovite and biotite, and is followed by a near-isothermal decompression during their exhumation through the detachment that separates them from the micaschists. These migmatitic rocks, like the underlying Beni Bousera peridotites and their HP granulite cover, are involved in a differential extensional unroofing linked to the Lower Miocene back-arc extension associated with the westward retreat of Alpine subduction.
- Rif belt,
- Alboran domain,
- migmatitic paragneiss,
- phase equilibria modelling,
- extensional exhumation

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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