U-Pb radiometric age of Nunarsuit pegmatite, Greenland

Constraints on the timing of Gardar magmatism

Adrian A. Finch, Joakim Mansfeld, T. O M Andersen

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    A precise U-Pb radiometric age of 1171 ±5 Ma has been obtained from zircons from a pegmatite in the Nunarsuit (previously spelt Nunarssuit) complex, Gardar Province, South Greenland. This age is slightly older than a corresponding Rb-Sr isochron determination. Since Nunarsuit is believed to be among the youngest Gardar centres, this radiometric age date more closely delimits the end of magmatism in the Gardar rift province. A comparison of our data with other published isotopic work may suggest that Gardar magmatism was a continuous rather than a punctuated process.

    Original languageEnglish
    Pages (from-to)1-7
    Number of pages7
    JournalBulletin of the Geological Society of Denmark
    Volume48
    Issue number1
    Publication statusPublished - 2001

    Keywords

    • Alkaline rocks
    • Cathodoluminescence
    • Gardar province
    • Mid-proterozoic
    • Nunarsuit complex
    • Zircons

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