Petrology and geotectonic significance of plagiogranite from the Sarikaraman Ophiolite (Central Anatolia, Turkey)

Plagiogranites within the supra-subduction zone (SSZ) type Saikaraman Ophio lite (SO), Central Anatolia, are very fine to coarse grained leucocratic ro cks with a range of occurrences as simple narrow fracture infilling to wide complex zones of net-veining or agmatites with numerous, partly assimilate d enclaves of gabbro and dolerite. Petrographically, they are characterized by the textures ranging from hypidiomorphic granular to granophyric interg rowths of quartz and plagioclase. Geochemically, major and trace elements d ata revealed that the plagiogranites belong to the typically low-potassium series of ophiolitic complexes and show similar geochemical characteristics with the Ocean-Ridge Granites. They are characterized by 10-20 times enric hed flat chondrite REE patterns with a negative Eu anomalies relative to ma fic component in the SO. This confirms the cogenetic nature of the plagiogr anites and indicates progressive fractionation in the Sarikaraman mafic mag ma. Field observations coupled with major-element and trace element chemistry s upport to a model by which the plagiogranites of SO could be formed as a fr actional crystallization of Sarikaraman basaltic magma in SSZ setting, like the other eastern Mediterranean ophiolitic plagiogranites such as Troodos, Pindos, and Oman.