Abstract
The airborne radiometric survey carried out in 1975 and 1976 in West Greenland (Secher, 1976, 1977), was followed in 1977 by field work on the ground. Areas with anomalous high radioactivity, detected during the airborne work, were examined using helicopter and handborne scintillometers. Between the valleys Arnangarnup kua and Sarfartoq, 60 km SSW of Søndre Strømfjord Air Base, a cluster of anomalies were shown to be related to a conspicuous area of carbonatite rocks now referred to as the Sarfartoq carbonatite complex (fig. 18).
Highlights
The airborne radiometric survey carried out in 1975 and 1976 in West Greenland (Secher, 1976, 1977), was followed in 1977 by field work on the ground
Kimberlites and associated carbonatite rocks in the area between Holsteinsborg and the actual area are mentioned by Bridgwater et al (1976) and Scott (1977)
The Sarfartoq carbonatite complex is situated 125 km north-east of the Phanerozoic Qaqarssuk carbonatite complex near Sukkertoppen (Nielsen, 1973; Secher, 1977)
Summary
The airborne radiometric survey carried out in 1975 and 1976 in West Greenland (Secher, 1976, 1977), was followed in 1977 by field work on the ground. Field work in 1977 has been concentrated on establishing the boundaries of the complex and obtaining an idea of the distribution of the radioactive elements For this purpose a detailed geochemical sampling programme was carried out in the area covering the complex. The marginal zone, more or less concordantly surrounding the core, consists of gneisses and amphibolites penetrated by discordant 5-100 cm wide dykes of carbonatite, various types of carbonatite breccias and agglomerates, and calcite veins. These dykes either radiate from the centre and have steep dips, or are tangential to the core outline with varying dips. Within the core the two main rock types ean be subdivided macroscopically by the colour of the weathered surfaces
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