Évolution géodynamique des Zones Internes des Cordillères Bétiques (Andalousie, Espagne) : Apports d’une étude pluridisciplinaire du Complexe Alpujárride

Eloïse Bessière 1, 2
2 Géodynamique - UMR7327
INSU - CNRS - Institut national des sciences de l'Univers, UO - Université d'Orléans : UMR7327, BRGM - Bureau de Recherches Géologiques et Minières (BRGM), ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327 : UMR7327
Abstract : The Betic-Rif Cordillera, located in the western Mediterranean region, forms a narrow, arcuate orogenic belt. By comparison with other orogenic belts in the Mediterranean realm, its geodynamic evolution is higly controversial because of a long and complex tectono-metamorphic history, including the Mesozoic rifting and the Alpine orogenesis where subduction, collisional and post-orogenic extensional events are successively recorded. This Ph.D. thesis aims to address two major issues about the geodynamic evolution of the Alpujárride Complex, a group of metamorphic units that belong to the Internal Zones of the Betic Cordillera. Two study areas have been investigated with (i) the peridotitic massifs located in the western part of this complex whose mechanisms and timing of exhumation remain unclear and (ii) the tectonic units located further east that display well-preserved high pressurelow temperature (HP/LT) mineral parageneses related to the Alpine subduction episode but with high uncertainties regarding the age of this metamorphic event. This work has been carried out by following a multi-scale and multi-disciplinary approach, from the outcrop- to the regional-scale, including detailed field mapping, structural measurements, petrographic observations, Raman thermometry and 40Ar/39Ar dating. Our results evidence (i) the exhumation of the Ronda peridotite controlled by an hyper-extension event associated with a rifting stage and (ii) the end of the HP/LT peak conditions around 38 Ma, just before the inception of the slab roll-back and back-arc opening associated with a high temperature-low pressure (HT-LP) metamorphic overprint. The Alpujárride Complex is exhumed during this stage, while the crust is higly stretched. This HT-LP metamorphic event ended with the thrusting of the Internal Zones of the Betic-Rif Cordillera onto the Iberian and African margins, around 20 Ma ago.
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Eloïse Bessière. Évolution géodynamique des Zones Internes des Cordillères Bétiques (Andalousie, Espagne) : Apports d’une étude pluridisciplinaire du Complexe Alpujárride. Sciences de la Terre. Université d'Orléans, 2019. Français. ⟨tel-02392008⟩

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