An Approach to the Origin of Young Volcanic Rocks of Western Turkey

Abstract

Young volcanism (± Post-Oligocene) in Western Turkey has evolved under a strong tectonic control. North-south shortening in the region lasted until the beginning of the late Miocene (± Tortonian) and was accommodated by an A-type subduction. This zone of A-type subduction reached into sub-crustal depths, and led to liberation of H2O, SiO2, K2O, LIL and radioactive isotopes. These liquids affected the overlying mantle, depressed its melting point and forced it to melt locally. They generated intermediate hybrid volcanic rocks of diverse composition.