Caledonian geology of Scoresby Sund Region, central East Greenland: Comparisons in the North Atlantic Borders

    Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedings

    Abstrakt

    The Geological Survey of Greenland has completed the first 3 years of a 5-year mapping campaign in the Scoresby Sund region, which includes the southernmost part of the Caledonian fold belt of East Greenland.

    The preliminary results show that it is possible to distinguish the following main geologic units in the Caledonian fold belt: (1) a Precambrian crystalline basement with a cover of Precambrian metasedimentary and metavolcanic rocks; these rocks have been affected to varied degrees by Caledonian folding; (2) a metamorphosed but nonmigmatized supracrustal complex composed of psammitic and pelitic rocks containing scattered bands of calcareous rocks and totaling several kilometers in thickness; these rocks represent Caledonian geosynclinal deposits of miogeosynclinal aspect and are probably of very late Precambrian age; (3) a Caledonian infracrustal complex of mainly gneisses, migmatites, and synkinematic granites; this unit was formed by migmatization of Caledonian geosynclinal deposit ; and (4) late to post-Caledonian intrusions mainly of granitic type.

    Westward-directed thrust sheets with a displacement of several tens of kilometers are present along the western rim of the fold belt. They comprise largely Caledonian supracrustal rocks, but locally basement rocks are also incorporated in the thrust sheets. The central part of the north-south-directed fold belt is characterized by infracrustal rocks with simple low-dipping macroscopic structures; in some parts of the area these structures can be shown to be the limbs of major recumbent folds.

    The Caledonian supracrustal rocks in the western part of the region were metamorphosed under high-pressure conditions and are characterized by kyanite-bearing rocks. In contrast, the rocks of the central migmatitic part of the region were formed under low-pressure conditions and are characterized by cordierite-bearing assemblages.
    OriginalsprogEngelsk
    TitelArctic Geology
    UndertitelProceedings of the Second International Symposium on Arctic Geology held February 1-4, 1971, at San Franisco, California
    RedaktørerMax G. Pitcher
    ForlagAmerican Association of Petroleum Geologists
    Sider440-452
    Antal sider13
    StatusUdgivet - 1973
    Begivenhed2nd International Symposium on Arctic Geology - San Francisco, USA
    Varighed: 1 feb. 19714 feb. 1971
    Konferencens nummer: 2

    Publikationsserier

    NavnAAPG Memoir
    ForlagAmerican Association of Petroleum Geologists
    Vol/bind19
    ISSN (Trykt)0271-8529

    Konference

    Konference2nd International Symposium on Arctic Geology
    Land/OmrådeUSA
    BySan Francisco
    Periode1/02/714/02/71

    Programområde

    • Programområde 4: Mineralske råstoffer

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