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Abstract
Túngarnit nunât forms part of the Isortoq gneiss complex of the Nagssugtoqidian orogenic belt. The following rock-types occurring in the area are described: hypersthene-biotite gneisses, biotite gneisses, garnet-biotite gneisses, amphibolites, and marbles and calc-silicate rocks. These rocks were metamorphosed in the lower part of the granulite facies, but a down-grading took place locally because of late dextral shear-movements. The main Nagssugtoqidian deformation produced mesoscopic folds as well as large-scale structures, and thrusting is a common feature of the deformation. This combined with the later shearing caused a reorientation towards parallelism of the structural elements so that the lithological units now form an ENE trending 'linear belt'. After the main Nagssugtoqidian deformation and the late shearing, weak folds were formed with axial planes striking SSE, and the rocks were intruded by pegmatites. Precambrian lamprophyres cut the gneisses.
Highlights
During the summers of 1968 and 1969 the author mapped the area of Tungarnit nunat on the northern side of the out1et of Nordre Strømfjord
Ramberg (1949) established the Nagssugtoqidian orogenic belt, named after the fjord Nagssugtoq (Nordre StrØmfjord), and showed it to be younger than the gneiss complex south of SØndre StrØmfjord
Ramberg (1949) stressed the importance of the ENE structural direction within the three gneiss complexes, and Noe-Nygaard & Berthelsen (1952) pointed out the very striking feature that in the region around Nagssugtoq areas of simple, open, large-scale structures alternate with areas characterised by persistent ENEtrending lithological units creating a linear pattern, which was thought by NoeNygaard & Berthelsen to be due to a horizontal trend of the fold axes
Summary
During the summers of 1968 and 1969 the author mapped the area of Tungarnit nunat on the northern side of the out1et of Nordre Strømfjord. This work forrned part of a project by students from the Universities of Aarhus and Copenhagen, under the supervision of E. 1N (1:100 000) for the Geological Survey of Greenland. A series of progress reports have been given of the work (see Bondesen, 1970, for details)
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