Les intrusions de Wirgane (Haut Atlas occidental, Maroc): témoins d'un magmatisme syn- à tardi-cinématique hercynien? (Intrusions of Wirgane [western High Atlas, Morocco]: evidence for a syn- to late kinematic magmatism of Variscan age?)

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The Wirgane intrusives were emplaced into the Late Neoproterozoic to Palæozoic series of the northeast of the Moroccan western High Atlas. The intrusions exhibit a large compositional range from monzogabbro to granite, and they have suffered, together with the country rocks, part of the Variscan tectonic evolution. In the immediate vicinity of the intrusions, thermal metamorphism developed in the country rocks. According to the mineral chemistry of igneous amphibole compositions of diorites and metamorphic minerals, the depth of intrusives was estimated to be less than 11 km. Strain patterns, mapped in both the plutons and the country rocks, and microtectonic data indicate that the intrusions were emplaced in a dextral transcurrent shearing context during the Variscan Orogen. When compared with other intrusions of the western High Atlas (Tichka, Azegour), the Wirgane intrusives are considered to be related to the late stages of the Variscan Belt of Morocco.