Pan-African high-pressure metamorphism in the Precambrian basement of the Menderes Massif, western Anatolia, turkey

The Menderes Massif is made up of Pan-African basement and a Paleozoic to E arly Tertiary cover sequence imbricated by Late Alpine deformation. The Pre cambrian basement comprises primarily medium- to high-grade schists, paragn eisses, migmatites, orthogneisses, metagranites, charnockites, and metagabb ros. High-pressure relies in the Pan-African basement are divided into two groups: eclogites and eclogitic metagabbros. The mineral assemblage in the eclogites is omphacite (Jd 44)-garnet-clinozoisite-rutile. The eclogites oc cur as pods and boudinaged layers in the basement schists and paragneisses. Inclusions found in the cores of the garnets indicate a medium-pressure pr otolith. The eclogitic metagabbros are closely related to Precambrian gabbr oic stocks. The igneous texture and relic magmatic phases are preserved in these high-pressure rocks, which are characterized by the mineral assemblag e omphacite (Jd 25)-garnet-rutile +/- kyanite. The P-T conditions of the Pa n-African high-pressure metamorphism in the eclogites are estimated to be 6 44 degreesC with a minimum pressure of approximately 15 kbar. The eclogites are partly to completely retrograded to garnet amphibolites by a Barrovian -type overprint which developed under isothermal decompression conditions. For this post-eclogitic event, the P-T estimates are 7 kbar and 623 degrees C. The eclogite relies provide strong support for a correlation of the Mend eres Massif with the Bitlis Massif in terms of common Pan-African high-pres sure evolution.