Archean mantle fragments in Proterozoic crust, Western Gneiss Region, Norway

Eloise E. Beyer*, Hannes K. Brueckner, William L. Griffin, Suzanne Y. O'Reilly, Stuart Graham

*Corresponding author for this work

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    Small volumes of garnet peridotite occur within large dunite bodies in the Western Gneiss Region of the Norwegian Caledonides. Previous Sm-Nd analyses of garnet peridotite yield Proterozoic ages close to the crystallization ages of the host gneisses. In situ (laser-ablation multicollector-inductively coupled plasma-mass spectrometry) Re-Os analysis of sulfides in the garnet peridotites gives a range of Proterozoic and Archean model ages. An Archean (2.7-3.1 Ga) protolith age is supported by whole-rock Re-Os data for sulfide-free dunites from several bodies. The Archean ages imply a melt-extraction event in the lithospheric mantle that predates the growth of the known Proterozoic upper crust in the region.

    Original languageEnglish
    Pages (from-to)609-612
    Number of pages4
    JournalGeology
    Volume32
    Issue number7
    DOIs
    Publication statusPublished - Jul 2004

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