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    Complexity of the early Archean Uivak Gneiss: Insights from Tigigakyuk Inlet, Saglek Block, Labrador, Canada and possible correlations with south West Greenland

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    Authors
    Salacinska, A.
    Kusiak, M.
    Whitehouse, M.
    Dunkley, Daniel
    Wilde, Simon
    Kielman, R.
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Salacinska, A. and Kusiak, M. and Whitehouse, M. and Dunkley, D. and Wilde, S. and Kielman, R. 2018. Complexity of the early Archean Uivak Gneiss: Insights from Tigigakyuk Inlet, Saglek Block, Labrador, Canada and possible correlations with south West Greenland. Precambrian Research. 315: pp. 103-119.
    Source Title
    Precambrian Research
    DOI
    10.1016/j.precamres.2018.07.011
    ISSN
    0301-9268
    URI
    http://hdl.handle.net/20.500.11937/70066
    Collection
    • Curtin Research Publications
    Abstract

    The Saglek Block of Labrador comprises Eoarchean to Neoarchean lithologies, metamorphosed at high temperature at ca. 2.7 Ga. Here, we investigate the gneisses of Tigigakyuk Inlet, previously identified as the locality exposing the most ancient rocks in the Saglek Block. New geochronological and geochemical results reveal a multistage history. Precise magmatic emplacement ages of 3.75–3.71 Ga refine the age of the Uivak Gneiss. Zircon rims and neoblastic grains with low Th/U record metamorphism at ca. 3.6 and 2.8–2.7 Ga. Magmatism between these tectono-metamorphic events is recorded by the presence of meta-mafic dykes in the gneisses, gabbroic enclaves in ca. 2.7 Ga syn-tectonic granitoids, as well as by a ca. 3.56 Ga age for monzonitic gneiss in which metamorphic zircon is present as xenocrysts. Felsic (TTG) magmatism between ca. 3.75 Ga and 3.71 Ga, as well as metamorphism at both ca. 3.6 Ga and 2.8–2.7 Ga, is also recognised in the Itsaq Gneiss Complex of south West Greenland, and is restricted to the Færingehavn Terrane. Our new data enable a more rigorous correlation between these formerly conjugate parts of the North Atlantic Craton.

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