Evolución tectonotermal del Macizo Hercínico de Rehamna en la región de Skhour - Ouled Hassine - Lalla Tittaf (Meseta Occidental, Marruecos)

Abstract

In the Rehamna Massif, In the Moroccan Hercynian Belt, metamorphic peak conditions in the LI - T part o f the amphibolite facies were reached during the development o f a intermediate P/T - barrovian like - metamorphism, which it is related to a first compressive tectonic regime. The regional baric peak is essentially coincident with the thermal peak and shows moderate variations in the different domains of the massif, which can be considered as strictly related to their relative structural positions. The syn - late - D2 extensional regime was caused by the gravitational collapse of the thickened crust, which was thence affected by a pronounced and probably fast uplift. This extension caused a general post - peak decompressive and slightly retrogressive P - T path, coeval with the approach between Eastern Rehamna and Central Rehamna