Abstract
The Izmir-Karaburun region is located on the West coast of Turkey. In this area volcanic rocks of the late Miocene-Pliocene age outcrop. On the basis of the collected petrographic and geochemical data it has been possible to subdivide these rocks in to three series:a) calc-alkaline series of Karaburun-Koca dag-Izmir (quantitatively the most important). This series is formed by latite-andesites-dacites-rhyodacites.b) Silicic series of Izmir-Lebedos, mainly constituted by alkali rhyolitic rocks.c) Urla series, formed by alkali trachytes and alkali rhyolites, associated with scarce basic lavas of hawaiitic type. A different genesis is assumed for these series. In a first phase the latite-andesitic magma was formed by a partial melting in the lower crust or in the upper mantle. Afterwards a subcrustal magma with alkali basaltic affinity rose slowly through the crust forming an intermediate reservoir and differentiating predominantly towards alkali trachytic terms. Finally silicic magma of Izmir-Lebedos was formed by an anatectic process. It is possible that the fusion has been favoured by the presence of basic magma in the upper crust.
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