Abstract: Rocks representative of three distinct metamorphic events P/T environments are recognised in theBilecik - Söğüt area. In the earliest phase the rocks of ophiolitic assemblage have undergone a progressivemetamorphism forming a gradual transformation from non-metamorphic to amphibolite. The district has been dividedin four distinct metamorphic zones proceeding from SB to NW. In a later phase a relatively high-pressure, low temperature metamorphism retrograded the earlier effects. This new phase was restricted to the occurrence of alkaliamphibole in the area mapped, but eastward formed typical blueschist facies mineral assemblages. In the last phase,tectonic juxtaposition of two groups of rocks of contrasting environments caused dynamic metamorphism, producedvarious degrees of cataclasis along a narrow belt.In this paper, the mineralogical data phase changes have been focused on, an attemp has been made todeduce orogenic implications from different lines of evidence including petrographic, structural field observations.