Abstract
Alkaline volcanics exposed at similar stratigraphic levels in Upper Cretaceous at Bayburt, Amasya-Gümüşhacıköy and Ankara-Kalecik locations along the southern boundary of the Sakarya Zone provide macroscopically two different lithologies which are containing large pyroxene porphyries and large analcimized leucite porphyries. These rocks formed as a result of the low-grade partial melting of the metasomatized phlogopite-rich mantle rocks, which resulted in the step subduction angle of the aged oceanic crust before the collision. In the course of following their cases, in the middle / shallow depths of the crust, in the magma chambers they underwent differentiation and reached two different lithologies.
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