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    Polygonal impact craters in the Argyre region, Mars: Evidence for influence of target structure on the final crater morphology

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    Author
    Öhman, T.
    Aittola, M.
    Kostama, V.-P.
    Hyvärinen, M.
    Raitala, J.
    Issue Date
    2006-01-01
    Keywords
    impact craters
    impact processes
    
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    Citation
    Öhman, T., Aittola, M., Kostama, V.-P., Hyvärinen, M., & Raitala, J. (2006). Polygonal impact craters in the Argyre region, Mars: Evidence for influence of target structure on the final crater morphology. Meteoritics & Planetary Science, 41(8), 1163-1173.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    URI
    http://hdl.handle.net/10150/656163
    DOI
    10.1111/j.1945-5100.2006.tb00513.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Impact craters that in plan view are distinctly polygonal rather than circular or elliptical are common on Mars and other planets (hman et al. 2005). Their actual formation mechanism, however, is somewhat debatable. We studied the polygonal craters of different degradational stages in the region of the Argyre impact basin, Mars. The results show that in the same areas, heavily degraded, moderately degraded, and fresh polygonal craters display statistically similar strike distributions of the straight rim segments. The fact that the strike distributions are not dependent on lighting conditions was verified by using two data sets (Viking and MOC-WA) having different illumination geometries but similar resolutions. In addition, there are no significant differences in the amount of polygonality of craters in different degradational stages. These results clearly imply that large-scale polygonality is not caused by degradation, but originates from the cratering process itself, concurring with the findings regarding lunar craters by Eppler et al. (1983). The straight rims of polygonal craters apparently reflect areal fracture patterns that prevail for a geologically long time.
    Type
    Article
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2006.tb00513.x
    Scopus Count
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    Meteoritics & Planetary Science, Volume 41, Number 8 (2006)

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