The Eoarchaean formation of the North Atlantic Craton

Penelope J. Lancaster, Craig D. Storey, Chris J. Hawkesworth

    Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)peer-review

    Abstract

    The Archaean North Atlantic Craton underpins much of North America, Greenland and northern Europe, and incorporates the Earth’s oldest extant continental crust. This paper reviews the current understanding of the region’s crustal evolution, and considers our ability to investigate interrelationships between different fragments of the North Atlantic Craton. Detrital zircons from Mesoproterozoic to Cambrian basal sediments in NW Scotland have been re-examined in light of new data from the Archaean Tarbet supracrustal unit and the Palaeoproterozoic Rubha Ruadh granite. Hf model ages are recorded from 4160 to 1410 Ma, peaking at c. 3350 Ma, and are associated with U–Pb crystallization ages from 3670 to 1070 Ma, peaking at c. 2700 and 1700 Ma. The Rubha Ruadh granite is consistent with partial melting of Northern Region basement without contamination by juvenile magmas or supracrustal material, while the Tarbet Supracrustals record a minimum model age of c. 3200 Ma. Each of these units records Hf model ages that imply remelting of Eoarchaean (4000–3600 Ma) crust. Similar distributions of crystallization and model ages have been identified around the North Atlantic Craton, suggesting that Eoarchaean crust was once extensive in the region and constitutes the foundation of both Scotland and the North Atlantic Craton.
    Original languageEnglish
    Title of host publicationContinent formation through time
    EditorsN. M. W. Roberts, M. Van Kranendonk, S. Parman, S. Shirey, P. D. Clift
    Place of PublicationBath
    PublisherGeological Society of London
    Pages261-279
    ISBN (Print)9781862393752
    DOIs
    Publication statusPublished - 2014

    Publication series

    NameSpecial publications
    PublisherGeological Society of London
    Volume389
    ISSN (Print)0305-8719

    Keywords

    • Lewisian
    • zircon
    • Hf
    • Eoarchaean
    • Scotland

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