Field work on the kakortokites and lujavrites in the Ilímaussaq intrusion, South Greenland

Abstract

In the field season 1977 the study of the kakortokites and the lujavrites was continued in the southem part of the Ilimaussaq intrusion. The mapping was extended to the Agpat area (fig. 25) and a number of sample profiles were coIIected. S. A., assisted by Peder M. Sørensen and Emanuel Kristiansen, worked to the north-west of the river Lakseelv; H. B. and Ingrid Salinas to the south-east of the river. Mapping on the scale l:5000 of the kakortokites and the larger part of the main lujavrite outcrop is now completed. Five units have been distinguished (fig. 26). The lower part of the profile - kakortokite to aegirine lujavrite II - has been measured to the south-east of Lakseelv, whereas the higher units are found in the Agpat region. The two subareas are divided by the Lakseelv fault. A similar sequence, but with a different thickness, exists at the head of Kangerdluarssuk (A. Demina, personal communication).