Abstract: The present research area lies in the eastern part of the Menderes Massif, near Alaşehir-Manisa. In thisregion, three metamorphic rock groups are recognised on the basis of their lithologies and structural positions, namely,the Gneiss Complex, the Schist Complex and the Marbles.Petrographic, mineralogical and structural data indicate that the Schist Complex have undergone at least threephases of metamorphism. The first phase has been partially obliterated by the second phase which is in the amphibolitefacies. The Gneiss Complex comprises porphyroblastic, augen, massive granitic and banded gneises, and some migmatites. Geological, petrographical and chemical evidence shows that the Gneiss Complex suffered partial anatexis.For example mafic inclusions in certain gneisses of the Gneiss Complex represent restites. The Schist Complexcontains quartzo-feldspathic gneiss, garnet- mica schist, quartzite and augen gneiss.During the second phase of regional metamorphism, temperatures reached 600°C with accompanying pressures of5 kb in the Schist Complex, while 660°C with pressures of 5-6 kb in the Gneiss Complex.