Basement-cover relationships and regional structure in the Grandjean Fjord - Bessel Fjord region (75°–76°N), North-East Greenland

Johan D. Friderichsen, Niels Henriksen, Robin A. Strachan

    Research output: Chapter in Book/Report/Conference proceedingChapter in report

    Abstract

    Geological mapping and isotopic investigations demonstrate that the Grandjean Fjord – Bessel Fjord region can be divided into three rock groups: (1) a Lower Proterozoic basement gneiss complex; (2) a Middle Proterozoic supracrustal cover (Smallefjord sequence); and (3) Upper Proterozoic metasediments (Eleonore Bay Supergroup). The basement gneiss complex largely comprises c. 2.0–1.7 Ga calc-alkaline granitoid orthogneisses with intercalated migmatitic supracrustal rocks. The complex is deformed by at least two sets of approximately coaxial folds which may be either Proterozoic or Caledonian in age. The Smallefjord sequence is comprised mostly of migmatitic schists and gneisses which underwent high-grade metamorphism during the late Middle Proterozoic. The dominant deformation structures within the Smallefjord sequence are associated with the development of ductile shear zones along the boundaries of all the major tectonostratigraphic units and are thought to be Caledonian in age.
    Original languageEnglish
    Title of host publicationGeology of North-East Greenland
    EditorsA.K. Higgins
    PublisherGrønlands Geologiske Undersøgelse
    Pages17–33
    Number of pages17
    DOIs
    Publication statusPublished - 1994

    Publication series

    SeriesRapport Grønlands Geologiske Undersøgelse
    Volume162
    ISSN0418-6559

    Programme Area

    • Programme Area 4: Mineral Resources

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