40Ar/39Ar mineral age record in NE Greenland: Implications for tectonic evolution of the North Atlantic Caledonides

R.D. Dallmayer, R.A. Strachan, N. Henriksen

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    51 Citationer (Scopus)

    Abstrakt

    40Ar/39Ar mineral ages have been determined from basement gneisses and cover sequences exposed in the Caledonides of NE Greenland. These range between c. 438 Ma and c. 370 Ma. They are interpreted as dating cooling following polyphase Caledonian metamorphism which completely reset argon systems within the (early Proterozoic) basement gneisses. The 40Ar/39Ar results indicate that thrust-related regional deformation and metamorphism in NE Greenland continued into the early Devonian. This contrasts with Scandinavia, where nappe stacking was largely completed by the early-mid-Silurian and was followed by regional extension and tectonic unroofing in the late Silurian-mid-Devonian. -Authors

    OriginalsprogEngelsk
    Sider (fra-til)615-628
    Antal sider14
    TidsskriftJournal of the Geological Society
    Vol/bind151
    Udgave nummer4
    DOI
    StatusUdgivet - aug. 1994

    Programområde

    • Programområde 4: Mineralske råstoffer

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