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    The Lomonosov Crater Impact Event: A Possible Mega-Tsunami Source on Mars

    76660.pdf (3.899Mb)
    Access Status
    Open access
    Authors
    Costard, F.
    Séjourné, A.
    Lagain, Anthony
    Ormö, J.
    Rodriguez, J.A.P.
    Clifford, S.
    Bouley, S.
    Kelfoun, K.
    Lavigne, F.
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Costard, F. and Séjourné, A. and Lagain, A. and Ormö, J. and Rodriguez, J.A.P. and Clifford, S. and Bouley, S. et al. 2019. The Lomonosov Crater Impact Event: A Possible Mega-Tsunami Source on Mars. JGR Planets. 124 (7): pp. 1840-1851.
    Source Title
    JGR Planets
    DOI
    10.1029/2019JE006008
    ISSN
    2169-9097
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT170100024
    Remarks

    Copyright © 2019 American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/76439
    Collection
    • Curtin Research Publications
    Abstract

    ©2019. American Geophysical Union. All Rights Reserved. Recent research suggests that major meteorite impact events into a Late Hesperian/Early Amazonian ocean likely produced a mega-tsunami that would have resurfaced coastal areas in northwestern Arabia Terra. The orientations of the associated lobate deposits, a conspicuous type of landforms called Thumbprint Terrain, suggests that if an impact event triggered the mega-tsunami, the most likely location of the source crater is within the northern plains regions situated north of Arabia Terra. This study focuses on the identification of impact craters that impacted into the ocean and are likely to have produced the tsunami. We selected 10 complex impact craters, based on their diameters, location, and geomorphic characteristics. Of those, the Late Hesperian ~120-km-diameter Lomonosov crater exhibits a unique topographic plan view asymmetry (compared to other similar-sized and similar-aged craters in the northern plains such as Micoud, Korolev, and Milankovic). We attribute its broad and shallow rim, in part, to an impact into a shallow ocean as well as its subsequent erosion from the collapsing transient water cavity. The likely marine formation of the Lomonosov crater, and the apparent agreement in its age with that of the Thumbprint Terrain unit (~3 Ga), strongly suggests that it was the source crater of the tsunami. These results have implications for the stability of a late northern ocean on Mars.

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