The tectonometamorphic evolution of the Friningen peridotite lens

The Scandinavian Caledonides represent an eroded mountain belt which is stripped of its sedimentary cover. This makes the Scandinavian Caledonides a mountain chain where processes taking place in the middle and lower crust during the orogenic cycle can be determined through careful research. Tectonically emplaced peridotite lenses in continental crust are volumetrically minor. However, these lenses can place important constraints on the dynamics in the mantle wedge of the overriding plate during the collision between two terranes. The Friningen garnet peridotite lens is such a lens and is located in the High Pressure Central Belt of the Seve Nappe Complex. With the use of several methods, among which optical- and electron microscopy, bulk rock geochemical analysis and thermobarometry the tectonometamorphic evolution of the Friningen garnet peridotite lens is explained in the context of the Caledonian orogenic cycle. The results of this work show that the Early Caledonian metamorphism of the Seve Nappe Complex is due to a continent-continent collision.