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    Peak to post-peak thermal history of the Saglek Block of Labrador: A multiphase and multi-instrumental approach to geochronology

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    Authors
    Kusiak, M.
    Dunkley, Daniel
    Whitehouse, M.
    Wilde, Simon
    Salacinska, A.
    Konecný, P.
    Szopa, K.
    Gaweda, A.
    Chew, D.
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Kusiak, M. and Dunkley, D. and Whitehouse, M. and Wilde, S. and Salacinska, A. and Konecný, P. and Szopa, K. et al. 2017. Peak to post-peak thermal history of the Saglek Block of Labrador: A multiphase and multi-instrumental approach to geochronology. Chemical Geology. 484: pp. 210-223.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2017.10.033
    ISSN
    0009-2541
    URI
    http://hdl.handle.net/20.500.11937/60715
    Collection
    • Curtin Research Publications
    Abstract

    The Saglek Block of coastal Labrador forms the western margin of the North Atlantic Craton, where Archean gneisses and granulites have been reworked during the Paleoproterozoic. Previous work has established that the block is a composite of Eoarchean to Mesoarchean protoliths metamorphosed to upper amphibolite and granulite facies at around 2.8-2.7. Ga. New in-situ microbeam dating of accessory minerals in granoblastic gneisses reveals a complex peak to post-peak thermal history. Zircon growth at ca. 3.7-3.6. Ga provides the age of formation of the tonalitic protoliths to the gneisses. Further zircon growth in syn-tectonic granitic gneiss and monazite growth in a variety of orthogneisses confirm peak metamorphic conditions at ca. 2.7. Ga, but also reveal high-temperature conditions at ca. 2.6. Ga and 2.5. Ga. The former is interpreted as the waning stages of the 2.7. Ga granulite event, whereas the latter is associated with a younger phase of granitic magmatism. In addition, apatite ages of ca. 2.2. Ga may represent either cooling associated with the 2.5. Ga event or a previously unrecognized greenschist-facies metamorphism event that predates the Torngat Orogeny.

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