Evoluzione metamorfica del basamento Austroalpino nell' area di Monte Sommo (Alpi Orientali) = Metamorphic evolution of the Austroalpine basement in the Mt. Sommo area (Eastern Alps)

In this work I studied 30 thin sections of metapelites from the Mt. Sommo (Sumbuck) area in the Eastern Alps, where the Austroalpine basement outcrops. The petrographic and microstructural study of these samples provided information on the metamorphic evolution of the Austroalpine basement in this area. A sequence of crystallisation and deformational events have been recognised and associated to the Variscan and Alpine metamorphic events. A further metamorphic overprint has been also locally recognised, attributed to the intrusion of a magmatic body, which is probably lying at shallow depth, and is coeval to the Vedrette di Ries pluton. Pressure-temperature conditions of the different metamorphic events have been estimated based on the mineral assemblages using suitable petrogenetic grids.