Distribution of volcanic activity in space and time.

Abstract

There are many volcanic rocks in the Rhenish massif, with ages ranging Middle Cretaceous-youngest Pleistocene, based on K/Ar and 14C dating. The oldest post-Permian volcanic rock is in the Wittlich basin and has an age >100 m.y. The main volcanicity of the Rhenish massif occurred in the Hocheifel area from Upper Eocene-Middle Miocene. Volcanic activity in the Siebengebirge, Westerwald and Rhon was Upper Oligocene-Lower Miocene; during the Middle Miocene, the Vogelsberg and the northern Hessian volcanic province were active.-J.M.H.