Field investigations in the Julianehåb granite on the nunataks north-west, north and east of Narssarssuaq, South Greenland

Abstract

Before the compilation of the Narssarssuaq sheet (1:100 000) could be finished, about 900 km² of high mountainous terrain in the north-western, northern and eastern parts of the sheet area had to be mapped. Important occurrences of supracrustal rocks have been found in three different places. One, north-west of Narssarssuaq, consists of interbanded ampbibolite, semipelitic gneiss and aplitic gneiss. The two other occurrences, both in the north, consist of acid and also some intermediate porphyhtic metavolcanics alternating with layers of pyrodastic rocks and aplitic gneiss.