ALPINE PRESSURE-TEMPERATURE-TIME-DEFORMAT ION PATH EVOLUTION OF AMPHIBOLITES FROM THE SOUTH-WESTERN PART OF THE TAUERN WINDOW (EASTERN ALPS)

(Ca-Na)amphiboles coexisting with albite, epidote, chlorite and quartz crystallized during the Alpine deformation of Mesozoic metabasites in the Penninic unit of the south-western Tauern window. Core-to-rim zon ations of the minerals were used for geothermobarometry based on amphi bole parageneses. The prograde P-T path is clockwise and corresponds t o an early stage of deformation preserved inside microlithons. The ret rograde path of the later stage of deformation is also clockwise, and evolves from 7 kbar-620-degrees-C (peak of metamorphism) to 2 kbar-550 -degrees-C, followed by a final isobaric cooling to 400-degrees-C.