K-Ar ages of the Owl Mts gneiss raft

Abstract

K-Ar ages have been found for paragneisses, granite gneisses and pegmatites of the Owl Mts raft. The results fall within the 412-489 MA and 643-655 MA intervals. These ages are younger than the primary age of deposition, metamorphism and folding of the Owl Mts raft. Yet similar disagreements are common in the Precambrian massifs of central Europe. The age of the gabbro massifsa surrounding the Owl Mts raft has been indirectly found to fall between Ordovician/Silurian and Upper Devonian.