Nagssugtoqidian supracrustal metavolcanic rocks of Sarfartûp nunâ, Søndre Strømfjord, central West Greenland

Abstract

The area discussed here is situated 8 km north of the Sukkertoppen Iskappe and 10 km east of Søndre Strømfjord at 66°27'N, 51°50'W. The work was undertaken during August as part of the programme led by Dr. J. Watterson (see this report). The outcrop of supracrustal metavolcanic rocks is less than 15 km² in extent. They consist of greenschist to low amphibolite facies schists disposed in an eastwest trending synformal basin and overlying Archaean gneisses modified by Nagssugtoquidian shearing. The south-eastern margin of the Nagssugtoqidian mobile belt is 15 km east of this area (Bridgwater et al., 1973).