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The Godthabsfjord region of southern West Greenland is now considered to consist of a minimum of three terranes including: the Akia terrane, the Akulleq terrane, and the Tasiusarsuaq terrane. The ...geochronology and geochemistry of the mid-Archaean Akia terrane, which is dominated by the type-Nuk gneisses, is the focus of this study. Chemical and isotopic analyses lead to the conclusion that the type-Nuk gneiss igneous precursors were produced by partial melting of basic crust with variable amounts of garnet in the residue. Large volumes of tonalitic magmas produced in this manner underwent subsequent fractionation of hornblende (and to a lesser degree plagioclase) producing melts of trondhjemitic and granodioritic composition. Precise U-Pb zircon analyses, determined by both ion microprobe and small sample techniques, of a number of type-Nuk gneisses show a range of ages from 2920 to 3040 Ma. The data are insufficient in number to confidently conclude whether magmatic activity was of a prolonged or episodic nature, though there appears to be a clustering of ages at about 3000 Ma. Regions within the Akia terrane previously identified as being composed of Ami tsoq gneisses show no isotopic evidence of being Ami tsoq in nature. Ion microprobe data do suggest that some of these areas may be remnants of felsic crust some 3250-3400 (?) Ma old. Uranium-Pb SHRIMP zircon analyses gave an age of 3193 $\pm$ 7 Ma (2$\sigma$) for the dioritic protoliths of the Nordlandet granulites of the region, with peak granulite-facies metamorphism occurring at 3014 $\pm$ 7 Ma (2$\sigma$). Consequently, the Nordlandet protoliths are $\geq$150 Ma older than the igneous precursors of the type-Nuk gneisses and proves the two are not contemporaneous. The granulites show extreme depletion in many of the LILE, especially Rb, Th, U, K, and Cs making them the most depleted granulites on record (K/Rb up to 11000). Geochemical evidence does not indicate LILE depletion via partial melt extraction though locally this may have been a factor. LILE depletion via a fluid phase is the favoured mechanism of depletion. Finally, the 'refined' single-bead zircon technique, developed as part of this study, provides a simple and elegant means of Pb separation for single-zircon work, with a very small Pb blank.
Previous geological work on the 1:100000 map sheet 64 V.l N (fig. 15) includes published maps of smaller areas by Berthelsen (1960, 1962) and Lauerma (1964), mapping by Kryolitselskabet Øresund A/S ...(Bridgwater et al., 1976) and mapping by GGU geologists for the 1:500000 map sheet Frederikshåb Isblink - Søndre Strømfjord (Allaart et al., 1977, 1978). The Amltsoq and Niik gneisses and Malene supracrustal rock units south and east of Godthåbsfjord have not so far been correlated with rocks in the Fiskefjord area. Godthåbsfjord separates the granulite facies gneisses in Nordlandet from amphibolite facies Nûk gneisses on Sadelø and Bjørneøen; the granulite facies metamorphism occurred at about 2850 m.y. (Black et al., 1973), while no published isotopic age determinations from the Fiskefjord area itself are available.
The 1977 field season was the last in the series of six planned by GGU and the University of Exeter for the mapping of the Buksefjorden region (fig. 23). As in some of the earlier years, operations ...were mounted from a base at Nordafar. Support was provided by the GGU motor cutter N. V. Ussing throughout the season and on four days by helicopter from Greenlandair Charter A/S. We wish to acknowledge the assistance provided by officials at Nordafar, by Mr. Dave Pedersen of Greenlandair Charter A/S and especiaIly by skipper Flemming Nielsen. We also wish to record the valuable contribution made during the season by M. Ramakrishnan of the Geological Survey of India who worked with the group, nominally as an assistant. The weather was exceptionally good and tbis contributed to the smooth running of the programme.
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