Continuation of the mapping of Archaean rocks in the southern part of the Ivisârtoq map sheet

Abstract

Field work was resumed in the southern part of the Ivisartoq map sheet in the 1982 field season. S.R. completed an area in Kangiussap nuna and undertook special investigations including detailed sampling for isotope studies in selected areas in more northern parts. K.c. was joined by M.B. for mapping in Nunatarssuaq so that by the end of the field season more than three quarters of the southern part had been mapped and the work is well up to schedule (fig. 12). The ground covered in 1982 presented problems similar to those of 1981, the main difficulty being that of assigning quartzo-feldspathic gneisses to one of the established groups. The well tried criteria have again proved to be fallible and Ouf conviction that a large scale isotope programme is essential is strengthened. This programme is already in hand.