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During the Late Miocene to Pleistocene, Western Anatolia and the Aegean area were affected by scattered alkali basaltic activity that was temporally distinct from the older orogenic magmatism related to the subduction of Africa beneath the Anatolian and Aegean plates. On the basis of geochemical and isotopic data, two groups of alkali basalts have been distinguished. The first group (Foça, Urla, Selendi, Samos, Chios, Patmos, and Psathoura) exhibits a wide variability in isotopic composition (87Sr/86Sr 0.7043–0.7079; 143Nd/144Nd 0.51278–0.51243) and trace-element distribution (Th/Ta 2.4–12.3; Ba/Nb 14–49) probably acquired from a subduction-related component. The second...

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