Tire'nin güney kesimindeki eklojitlerin jeokimyasal mineralojik ve petrografik incelemesi, Menderes masifi Ödemiş- Kiraz asmasifi

The study area. is located in the eastern of Tire, ödemiş-Kiraz Submassif of the Menderes Massif, and covers an area of approximately 42 km2. In the region, Menderes metamorphics can be divided into two main units consisting of allochtonous and autochtonous units in terms of their tectonic setting. The most widespread unit in the study area is occured by garnet- mica schists which are a member of autochtonous unit. Phyllite interlayers are also observed in the garnet-mica schists. Allochtonous units in region, which rest upon the garnet-mica schist with tectonic contact, make up of the core series of Menderes Massif and consist mainly of acidic metavolcanite, gneiss, migmatite, metagabbro, amphibolite, eclogite and granulites. Acidic metavolcanite, gneiss and migmatites represent extremely transitional contacts with each other. Metagabbros are stock and vein in character and were amphibolitized along their marginal zones. In the study area, some preserved relict parageneses belonging to a former granulite facies metamorphism, were determined in the allochtonous units consisting of pyroxene gneiss, metagabbro and pyroxene granite (charnockite). Especially the charnockitic rocks contain common hypersthene, perthitic orthoclase and antiperthitic plagioclase that are typical of granulites. The last metamorphism under medium pressure/ medium- high temperature conditions caused very common retrograde effects on the granulite assemblage. The first stage of this retrograde transformation from granulite to upper amphibolite facies assemblages are characterized by the garnet forming corona reactions around the initial granulite phases such as garnet-l, biotite-l, hypersthene and ilmenite/rutile, and this retrogression was culminated by the conversion of the orthopyroxene to amphibolite and/ or by the replacement of the hypersthene by the biotite-ll. It was determined that the partly preserved eclogites occur as irregular lense-shaped bodies in the garnet amphibolite marginal zones surrounding the metagabbro stocks. The eclogites which are represented by omphacitic clinopyroxene and garnets, exhibit common transformation to garnet amphibolites by retrograde effects due to the last main metamorphism under almandine-amphibolite facies conditions.According to present evidence, it can be suggested that allochtonous units in the area were undergone poly met amorphic evolution, allochtonous units of the region were firstly suffered by granulitic metamorphism under high temperature conditions. The eclogites wrapping the metagabbro stocks, testify also the presence of a high-pressure phase during the metamorphic evolution of the Menderes Massif. According to the highest jadeite content in omphacitic clinopyroxenes, calibrated data indicate that the primary eclogite facies assemblage equilibrated at 625±50°C temperature and at pressure in excess of 15 kbar. Mineralogical and textural relations reveal that the last main metamorphism affected both of cover and core series of Menderes Massif. This last main metamorphism took place under the upper amphibolite facies conditions and caused widespread retrograde alterations in granulite and eclogite. The Cyclade islands in the medium Aegean Sea display great similarities with the Menderes Massif in terms of lithostratigraphical succession and metamorphic history. The Cyclades have been subjected to two subsequent Alpine metamorphic events: a high pressure blue schist metamorphism (Eocene) and medium-pressure barrovian type overprint (Oligocene/ Miocene boundry). The presence of high-pressure phase in Menderes Massif is of great importance for the correlation of these two regions, Cyclades and Menderes Massif, in terms of the relative ages of these metamorphic events