Kimolos and Polyegos compound volcanoes, which belong to the Milos volcanic field in the South Aegean arc, Greece, mainly consist of late Pliocene volcanic units. Their history can be divided into two periods of activity separated by a long quiescence phase, as testified by thick epiclastic deposits. Basaltic to rhyolitic lavas and voluminous pyroclastic rocks were erupted during the first period, whereas rhyolitic pyroclastic deposits and perlitic lava domes characterize the second period of activity. During the general period of stasis, activity only occurred NE of Kimolos, where the Geronikolas tuff ring and lavas were emplaced.

The rock composition belongs...