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Volatile species analysis of fluid inclusions in metamorphic quartz veins from the Llanbedr Formation, North Wales, show nitrogen to be an important component. Microthermometric and Laser Raman analysis indicates that the N 2 is resident in a generation of very N2-rich inclusions and demonstrates the presence of both N2-rich and aqueous fluids during metamorphism of the Llanbedr Formation. Nz-rich fluids do not appear to have been present in adjacent lithologies. Isotopic analysis ofN 2 indoi:10.1180/minmag.1988.052.367.03 fatcat:i6zucfe2r5fqtia2nilnatu2om