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    Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology

    Access Status
    Fulltext not available
    Authors
    Erickson, Timmons
    Kirkland, Chris
    Jourdan, Fred
    Schmieder, M.
    Hartnady, Michael
    Cox, Morgan A.
    Timms, Nick
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Erickson, T.M. and Kirkland, C.L. and Jourdan, F. and Schmieder, M. and Hartnady, M.I.H. and Cox, M.A. and Timms, N.E. 2021. Resolving the age of the Haughton impact structure using coupled 40Ar/39Ar and U-Pb geochronology. Geochimica et Cosmochimica Acta. 304: pp. 68-82.
    Source Title
    Geochimica et Cosmochimica Acta
    DOI
    10.1016/j.gca.2021.04.008
    ISSN
    0016-7037
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/90162
    Collection
    • Curtin Research Publications
    Abstract

    The Haughton Dome located on Devon Island, in the Canadian Archipelago represents a well-preserved, moderate-sized, complex impact crater. Previous age constraints for the 24 km-diameter impact structure have ranged from ca. 21 Ma to ca. 39 Ma. Herein, we present a coordinated microstructural and in situ U-Pb study of zircon and monazite coupled with 40Ar/39Ar laser step heating of shock-melted K-feldspar clasts from shock metamorphosed gneissic fragments collected from the allochthonous impact breccia at Haughton. Moderately shocked zircon and monazite grains yield an age distribution consistent with an Archean protolith metamorphosed at ca. 1.9 Ga, whereas shock recrystallized zircon and monazite yield a lower intercept age of 31.8 ± 1.7 Ma (n = 48, MSWD = 0.58, P = 0.99). Four inverse isochron 40Ar/39Ar ages of shocked feldspar clasts yield a weighted mean age of 31.04 ± 0.37 Ma (MSWD = 0.98, P = 0.40), within uncertainty of the U-Pb lower concordia intercept. Ar diffusion modelling supports the interpretation of the impact age and helps resolve impact-driven age resetting. These results highlight the power of coupling multiple geochronologic techniques for determining impact ages, especially from targets with complex geologic histories. Furthermore, they resolve previous discrepancies in the age of the Haughton Dome and the interpretation of the post impact stratigraphy of the crater fill.

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