Abstract
Abstract New surveys based on aerial photographs of the Mont-Dore massif (Auvergne, France) show the position of the network of dikes and their relation to faults, and thus throw light on the evolution of the Bourboule-Mont-Dore caldera and its magmas (trachyandesites). Volcanic-tectonic activity began in the Pontian and terminated in the lower Pliocene. Extrusion of lavas was simultaneous with caldera subsidence, which was contemporaneous with the tectonic processes responsible for orogenic activity in numerous areas borderingthe Alps.
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