Descriptive text to 1:500 000 sheet 7, Nyeboe Land, and sheet 8, Peary Land. The geology of North Greenland , a region characterised by Proterozoic, Palaeozoic and Mesozoic sedimentary basins, Silurian-Devonian orqgenic events (Ellesmerian, Caledonian) and Mesozoic-Tertiary block faulting and thrusting

    Publikation: Kort eller kortbeskrivelseGeologisk kort eller kortbeskrivelse

    Abstrakt

    A geological description is given of the 900 km by 250 km region of North Greenland covered by the two 1 :500 000 geological map sheets Nyeboe Land and Peary Land.

    North Greenland displays a well-exposed sequence of predominantly sedimentary rocks, related to eight tectonostratigraphic stages of basin development. The basement is formed by Archaean - Early Proterozoic crystalline rocks. Major basin developments include: (I) Middle Proterozoic fluvial and lacustrine sandstones (Independence Fjord Group, c. 1380 M a) overlain by plateau basalts (Zig-Zag Dal Basalt Formation , c. 1230 Ma) ; (2) Late Prot erozoic shelf sediment s (Hagen Fjord Group, c. 800-570 M a) and their deep water correlatives ; (3) Early Palaeozoic carbonate and siliciclastic sequences laid down in the east-west trending Franklinian Basin; distinction can be made between deposits of the southern carbonate shelf and those of the northern deep water trough (mainly siliciclastic sediments). In eastern North Greenland the Franklinian Basin sediments are affected by the north-south trendin g Caledonian fold belt (Silurian), whereas in the northern coastal areas across North Greenland the same sequences were affected by Ellesmerian orogenic deformation (Devonian/Early arboniferus) and gave rise to the east-west trending North Greenland fold belt.

    Following the Palaeozoic orogenic events, Late Pa laeozoic-Tertiary sedimentary sequences were deposited in a succession of superimposed and unrelated basins located in easternmost North Greenland collectively named the Wandel Sea Basin. This region was subjected to intense NW-SE trending faulting and related deformation during the Jurassic and Cretaceous. A Cretaceous volcanic episode gave rise to a peralkaline rock suite (Kap Washington Group) in northernmost Peary Land. Glaciation affected the whole of North Greenland.

    Limited exploration for minerals and hydrocarbons as well as geochemical surveys and hydrocarbon source rock studies have been carried out. Indications of mineralisations include potential for Cu, Zn and Ba. Hydrocarbon generation from Cambrian and Silurian source rocks has been widespread , but a high thermal maturity and a deep erosional level limit the potential for hydrocarbon accumulations.
    OriginalsprogEngelsk
    UdgiverGrønlands Geologiske Undersøgelse
    Antal sider40
    DOI
    StatusUdgivet - 1992

    Programområde

    • Programområde 4: Mineralske råstoffer

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