Abstract
An airborne radiometric survey 1975-76 (Secher, 1976, 1977) showed several anomalies in the area between Egedesminde and Færingehavn. The follow-up field programme from 1977-79 comprised detailed geological and radiometric mapping, as well as sampling of soil, stream water and stream sediments (Watt, 1977). Field operations were carried out from the GGU field station at Søndre Strømfjord Airbase, using one helicopter for two to four field parties, each summer. Two GGU cutters were utilised during a part of each season.
Highlights
An airborne radiometric survey 1975-76 (Secher, 1976, 1977) showed several anomalies in the area between Egedesminde and Færingehavn
U and Th mineralisations from the Sarfartoq carbonatite complex near Søndre Strømfjord are mentioned in preliminary reports by Secher & Larsen
Classification of mineralisation Several new observations on radioactive mineralisation were made, and a preliminary classification of them has been made. They ean be separated into two main groups: disserninated and vein mineralisation, which ean be further divided into subgroups, according to the combination of the characteristic radioactive minerals and the host rock
Summary
An airborne radiometric survey 1975-76 (Secher, 1976, 1977) showed several anomalies in the area between Egedesminde and Færingehavn. Legend: 1: in gneiss (unidentified U mineral); 2: in pegmatite (allanite, uraninite, euxenite (?»; 3: in pegmatite (monazite); 4: in carbonalite complex (pyrochlore); 5: in shear lOa km zones (Th minerals). Narrow Th-mineralised zones with intense shearing and carbonatite veining are frequently found in the marginal parts of the Sarfartoq complex This mineralisation is shown to have f'Ofmed during a hydrogenic stage of the carbonatite activity by the associated chlorite, hematite, REE-carbonate, barite, galena, sphalerite and goethite. These zones are seldom larger than 1 X 50 m, and average 3000 ppm Th, reaching up to 1.2 per cent, and 5-10 ppm U. Data on the U and Th contents are not available
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