Quaternary, potassic ultra-potassic volcanism associated with Gölcük caldera is represented by mainly effusive (tephriphonolites), extrusive (intra-caldera lava domes) and explosive (trachytic, trachy-andesitic ignimbrites ...

Upper Miocene - Pliocene sequence of the Sultansazlığı Basin consists of calc-alkaline magma series belonging to different systems in the east and west, and relatively young, nepheline normative, Na-alkaline effusive ...