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    Asymmetric signatures in simple craters as an indicator for an oblique impact direction

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    Author
    Poelchau, M. H.
    Kenkmann, T.
    Issue Date
    2008-01-01
    Keywords
    oblique Impact
    Wolfe Creek Impact Crater
    Western Australia
    impact structures
    impact ejecta
    
    Metadata
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    Citation
    Poelchau, M. H., & Kenkmann, T. (2008). Asymmetric signatures in simple craters as an indicator for an oblique impact direction. Meteoritics & Planetary Science, 43(12), 2059-2072.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656508
    DOI
    10.1111/j.1945-5100.2008.tb00661.x
    Additional Links
    https://meteoritical.org/
    Abstract
    In oblique impacts with an impact angle under 45 degrees, the bilateral shape of the distal ejecta blanket is used as the strongest indicator for an impact vector. This bilateral symmetry is attenuated and is superimposed by radial symmetry towards the crater rim, which remains circular for impact angles down to 10-15 degrees. The possibility that remnants of bilateral symmetry might still be present in the most proximal ejecta, the overturned flap and the crater rim was explored with the intention of deducing an impact vector. A model is presented that postulates bilateral patterns using proximal ejecta trajectories and predicts these patterns in the orientation of bedding planes in the crater rim. This model was successfully correlated to patterns described by radial grooves in the proximal ejecta blanket of the oblique Tooting crater on Mars. A new method was developed to detect structural asymmetries by converting bedding data into values that express the deviation from concentric strike orientation in the crater rim relative to the crater center, termed "concentric deviation." The method was applied to field data from Wolfe Creek crater, Western Australia. Bedding in the overturned flap implies an impactor striking from the east, which refines earlier publications, while bedding from the inner rim shows a correlation with the crater rim morphology.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2008.tb00661.x
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    Meteoritics & Planetary Science, Volume 43, Number 12 (2008)

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