Abstract
In northwest Turkey Eocene calc-alkaline intrusions with isotopic ages of 53 Ma to 35 Ma form a WNW-ESE trending belt, ~400 km long and ~60 km wide. In the east, the plutons intrude blueschists representing a subducted passive continental margin sequence with Late Cretaceous (~80 Ma) metamorphic ages. In the vicinity of one of these granitoids a low pressure - high temperature metamorphism has resulted in complete transformation of the blueschist metapelites into andalusite micaschists. The andalusite + cordierite + biotite + muscovite + quartz + K-feldspar + plagioclase paragenesis in the micaschists indicates a pressure of 2 ± 1 kbar and a temperature of 575 ± 50° C during the metamorphism. Rb-Sr muscovite and biotite ages of a micaschist sample are 46 ± 3 and 39 ± 1 Ma, respectively, similar to the 45.0 ± 0.2 Ma U-Pb zircon and Rb-Sr biotite ages from the neighbouring pluton. Development of folds and a new foliation in the andalusite micaschists suggest regional rather than contact metamorphism. The Eocene granitic magmatism and associated LP/HT metamorphism in northwest Turkey have probably formed above a NE directed subduction zone located along the Vardar suture.
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