Geochernistry and Ar-40/Ar-39 geochronology of Miocene volcanic rocks from the Karaburun Peninsula: Implications for amphibole-bearing lithospheric mantle source, Western Anatolia

New geochemical and Ar-40/Ar-39 age data are presented from the Neogene volcanic units of the Karaburun Peninsula, the westernmost part of Western Anatolia. The volcanic rocks in the region are associated with Neogene lacustrine deposition and are characterized by (1) olivine-bearing basaltic-andesites to shoshonites (Karaburun volcanics), high-K calc-alkaline andesites, dacites and latites (Yaylakoy, Armagandag and Kocadag volcanics) of similar to 16-18 Ma, and (2) mildly-alkaline basalts (Ovacik basalt) and rhyolites (Urla volcanics) of similar to 11 12 Ma. The first group of rocks is enriched in LILE and LREE with respect to the HREE and HFSE on N-MORB-normalised REE and multi-element spider diagrams. They are comparable geochemically with volcanic rocks in the surrounding regions such as Chios Island and other localities in Western Anatolia. The Ovacik basalt is geochemically similar to the first stage early-middle Miocene volcanic rocks but differs from NW Anatolian late Miocene alkali basalts