The age of carbonatites, kimberlites and lamprophyres from southern West Greenland: recurrent alkaline magmatism during 2500 million years

Lotte Melchior Larsen, David C. Rex, Karsten Secher

    Research output: Contribution to journalArticleResearchpeer-review

    41 Citations (Scopus)

    Abstract

    Alkaline rocks were intruded into the Precambrian basement in southern West Greenland during at least five separate episodes. The Tupertalik carbonatite intrusion was emplaced around or before 2650 m.y.; it is now metamorphosed in granulite facies but is recognisable by its trace element content. Lamprophyre dykes were intruded at ca. 1800 m.y. and again at ca. 1200 m.y. At ca. 600 m.y. the Sarfartôq carbonatite intrusion and extensive kimberlite dykes were emplaced in the Holsteiborg-Strømfjord region. At 225-115 m.y. the Qaqarssuk carbonatite complex was emplaced in the Sukkertoppen region, and numerous lamprophyre and kimberlite dykes were emplaced between Fishenasset and Ivigtut. All these episodes are correlatable with contemporaneous alkaline activity in Canada and Scandinavia and substantiate the periodicity of carbonatite emplacement. The Mesozoic suite of intrusions is related to rifting prior to continental break-up and the formation of the North Atlantic Ocean. The Eocambrian suite of 600 m.y. is thought to have formed under similar conditions during continental break-up and the formation of the Iapetus ocean.

    Original languageEnglish
    Pages (from-to)215-221
    Number of pages7
    JournalLithos
    Volume16
    Issue number3
    DOIs
    Publication statusPublished - 15 Jul 1983

    Programme Area

    • Programme Area 4: Mineral Resources

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