Koçak, KerimKaya, Raziye Merve2021-12-132021-12-1320192149-21232148-4171https://doi.org/10.17350/HJSE19030000143https://app.trdizin.gov.tr/makale/TXpRd056TTNOdz09https://hdl.handle.net/20.500.13091/890At the base of the Neotethyan ophiolitic melange, widespread epidote crystals formed in metamafic rocks of the metamorphic basement, which were experienced a regional metamorphism in green-schist facies conditions. The epidote crystals is subhedral to euhedral, with high Al2O3 (26-30 %) and low Fe2O3 (5–8%) contents. It is predominantly zoisite (Xcz = 0.46 to 0.72) and subordinate epidote (Xep =0.27-0.53) in composition, with typical compositional zoning due to variable substitution of Fe3+ and Al3+ on octahedral sites and sector-zoning. The epidote is suggested to have a possible igneous origin, and to be crystallised from a wet (H2O>5 wt %) magma under low fO2 and intermediate pressure conditions during initial stage crystallisation on the basis of its petrographical and mineralogical characteristics.eninfo:eu-repo/semantics/openAccessArticle10.17350/HJSE19030000143