A late Archaean pegmatite dyke swarm from the Isukasia area, southern West Greenland

The Isukasia area is dominated by early Archaean rocks that have been discussed extensively in the geological literature (Nutman et al., 1983). These rocks were deformed and recrystallised under amphibolite facies conditions during the late Archaean regional duetile deformation (Bridgwater et al., 1976; Nutman et al., 1983). The pegmatite dykes discussed here post-date this event but were succeeded by Proterozoic basic dykes, rare granitic sheets (Kalsbeek et al., 1980; Kalsbeek & Taylor, 1983), and then by Proterozoic faulting.