Un exemple de volcanisme du Protérozoïque inférieur en Côte d'Ivoire: zone de subduction ou zone de cisaillement?

The study of lava and pyroclastic formations from Odienné showed the calco-alkaline character of the volcanism in that region and revealed the structural context of its origin. It appears that, contrary to the general idea which links the calco-alkaline volcanism to the subduction zones, the Odienné volcanism is associated with the shearing constraints along Sassandra fault. The intensity of those constraints was such that it met the temperature and pressure conditions of a subduction zone.