Abstract: The Grenvillian granulite-facies complex on Holsnøy island, Bergen Arcs, W. Norway, has been metamorphosed at eclogite-facies conditions during the Caledonian orogeny (ca. 425 Ma). The granulite-eclogite facies transition takes place along shear zones and fluid pathways. Mineral thermobarometry indicates PT conditions of 800–900°C and 8–10 kbar for the Proterozoic granulite facies metamorphism and 700–800°C and 16–19 kbar for the eclogite-forming event. Quartz in the granulite facies complex contains CO₂ fluid inclusions with less than 2.5 mole percent N₂; the molar volumes are compatible with the PT conditions of the Proterozoic granulite metamorphism. Quartz in pegmatitic quartz + omphacite and quartz + phengite/paragonite veins coeval with shear-zone eclogites contain N₂ ± CO₂ fluid inclusions. Combined laser Raman microanalysis and microthermometry show that the least disturbed inclusions have X_CO2 = 0.1–0.3, and molar volumes less than 40 cm³/mole, which may agree with the PT conditions during Caledonian high-pressure metamorphism. Younger, low-density N₂ and N₂-H₂O fluid inclusions are the results of decrepitation and redistribution of early inclusions during the retrograde PT evolution of the eclogites.