COUNTERCLOCKWISE P-T-T TRAJECTORY FROM THE METAMORPHIC SOLE OF A NEOTETHYAN OPHIOLITE (TURKEY)

The Kiziltepe ophiolitic thrust sheet in the Bolkar Mountains of Turke y occurs between two subparallel ophiolite belts bounding the Tauride carbonate platform and represents a remnant of the Cretaceous Neo-Teth yan oceanic lithosphere. It is underlain by foliated amphibolite that represents a metamorphic sole developed at the inception of an intra-o ceanic subduction zone in the Neo-Tethys similar to 92-90 Ma. Blueschi st-facies overprinting of the amphibolite indicates that the metamorph ic sole was dragged deeper into the subduction zone where it experienc ed increasing P/T with cooling. Regional tectonic constraints suggest a Maastrichtian age for the timing of this blueschist-facies metamorph ism. Sodic amphibole-rich veins and crossite/Mg-riebeckite rims on hor nblende suggest that growth of blueschist-facies minerals was facilita ted by infiltration of fluid along fractures and grain boundaries. We infer a counterclockwise P-T-t trajectory during which metamorphism wa s accompanied/succeeded by rapid uplift along the northern edge of the Tauride belt in Late Cretaceous-early Tertiary time.