Abstract
Field investigations aimed at the produetion of a 1:500 000 map sheet of the Thule distriet were continued during August and early September. The unusuaIly poor weather conditions and the premature arrival of the winter's snowfall, reduced the season to some 20 effective working days. The field work was in two parts. At the beginning of the season a Jet Ranger helicopterwas chartered at Thule Air Base and four days were spent investigating nunatak and inland areas north of Savigsivik and Kap York and at the heads of Wolstenholme Fjord, Olrik Fjord and Inglefield Bredning. The second part was an investigation ofthe Proterozoic Thule Groupon Herbert ø, Northumberland Ø and Hakluyt Ø. Transport for this phase wasa locally hired boat from Avatak Henson of Moriussaq. Certain logistic support was supplied to H. R. Cooke who visited the Thule district at the end of the field season to assess the economic potential of various minerallocalities. Kurt Thomsen ably assisted both in Cooke's and the author's field programmes.
Highlights
Field investigations aimed at the produetion of a 1:500 000 map sheet ofthe Thule distriet ~ere continued during August and early September
Cooke who visited the Thule district at the end of the field season to assess the economic potential of various minerallocalities
The main rock types and the chronological deveiopment ofthe Precambrianbasement in the Thule district have been reported in earlier accounts (Dawes, 1972, 1975)
Summary
The main rock types and the chronological deveiopment ofthe Precambrianbasement in the Thule district have been reported in earlier accounts (Dawes, 1972, 1975). The northern contact of the Kap York meta-igneouscomplex with the gneisses, schists and psammitic rocks to the north is ice-covered in the De Dødes Fjord region. Contacts are concordant and it is not known if the gneisses (or part ofthem) represent an older basement to amphibolites (ofpossible igneous origin), and/or the pelitic and psammitic sediments Both gneisses and 'cover' rocks have been deformed and folded together by at least two important deformation phases. The Kap York meta-igneous complex post-dates the main deformation and metamorphism ofthe North Star Bugt area (Dawes, 1975). Further to the north the basement shows a wide variety of rock types and biotite-garnet schists, anorthosite and psammitic and amphibolitic supracrustal rocks occur as mappable units (Dawes, 1972)
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