Nappes de ponces du Cantal et du Mont-Dore; leurs aspects volcanologique, petrographique et mineralogique

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Abstract
In the volcanic massifs of Mont-Dore and Cantal (Central Massif of France), Villafranchian (Pleistocene) pumice 'nappes' occur. The pumice has an acidic and tholeiitic character and represents a type of ignimbrite. It originated from calc-alkaline material formed by remobilization of the gneissic basement of the large volcanoes, followed by a mixture of basalts and products of anatectic fusion. Granulometric analysis of the ignimbrite enables location of the calderas that were the centers of eruption. The temperature of the ignimbrites at the time of their emission is estimated at 900-1000 degrees C.

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