NEQQAZI, Amal University Hassan II of Casablanca - Faculty of Sciences Ben M’sik - Department of Geology, Morocco , RAJI, Mohammed University Hassan II of Casablanca - Faculty of Sciences Ben M’sik - Department of Geology, Morocco , BENFRIKA, El Mostafa University Hassan II of Casablanca - Faculty of Sciences Ben M’sik - Department of Geology, Morocco

Colour Alteration Index (CAI) of Visean conodonts from the Azrou-Khénifra Basin (Moroccan Meseta)

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Colour Alteration Index (CAI) of conodonts from the Middle and Late Visean sediments in the central domain of the Azrou-Khénifra Basin showed values between 2.5 and 4.5 corresponding to paleotemperatures between 90 °C and 250 °C. The present day thermal maturity may be explained by sedimentary burial, emplacement of gravity-driven nappes and thrust westward during the Visean stage of the Variscan orogeny. A gradual increase in CAI values eastward is compatible with a gradual transition from diagenesis in the west to low-grade metamorphism in the east.

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Conodont , CAI , Visean , Azrou , Khénifra Basin , Variscan orogeny

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