Age of rocks, structures, and metamorphism in the Nagssugtoqidian mobile belt, West Greenland - field and Pb-isotope evidence.

Feiko Kalsbeek, Paul N. Taylor, Niels Henriksen

    Publikation: Bidrag til tidsskriftArtikelForskningpeer review

    35 Citationer (Scopus)

    Abstrakt

    Two kinds of structural domains are distinguished in this mobile belt: 'Nagssugtoqidian' shear belts, which wrap around large areas in which 'pre-Nagssugtoqidian' fold structures are preserved. Field and Pb-isotope data are presented which suggest: 1) that some of the gneisses are Archaean, as previously thought, but there are also some gneisses derived from Proterozoic intrusive rocks; 2) most of the supracrustal rocks in the area are probably of Proterozoic age; 3) the main phase of metamorphism took place at 1880 + or - 50 m.y.; and 4) most of the structures developed during a Proterozoic orogeny that can be broadly correlated with the Hudsonian orogeny in the Canadian Shield. Pb-isotope data and Pb/Pb isochron parameters are presented for supracrustal rocks in the Nagssugtoqidian and Rinkian mobile belts of W Greenland, and similar data for the granites and gneisses of W Greenland. -P.Br.

    OriginalsprogEngelsk
    Sider (fra-til)1126-1131
    Antal sider6
    TidsskriftCanadian Journal of Earth Sciences
    Vol/bind21
    Udgave nummer10
    DOI
    StatusUdgivet - okt. 1984

    Programområde

    • Programområde 4: Mineralske råstoffer

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