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    Impact craters in the northern hemisphere of Mars: Layered ejecta and central pit characteristics

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    Author
    Barlow, Nadine G.
    Issue Date
    2006-01-01
    Keywords
    impact craters
    Martian water
    impact structures
    impacts
    ejecta
    
    Metadata
    Show full item record
    Citation
    Barlow, N. G. (2006). Impact craters in the northern hemisphere of Mars: Layered ejecta and central pit characteristics. Meteoritics & Planetary Science, 41(10), 1425-1436.
    Publisher
    The Meteoritical Society
    Journal
    Meteoritics & Planetary Science
    Description
    From the proceedings of the Workshop on the Role of Volatiles and Atmospheres on Martian Impact Craters held on July 11-14, 2005, at the Johns Hopkins University Applied Physics Laboratory.
    URI
    http://hdl.handle.net/10150/656190
    DOI
    10.1111/j.1945-5100.2006.tb00427.x
    Additional Links
    https://meteoritical.org/
    Abstract
    Mars Global Surveyor (MGS) and Mars Odyssey data are being used to revise the Catalog of Large Martian Impact Craters. Analysis of data in the revised catalog provides new details on the distribution and morphologic details of 6795 impact craters in the northern hemisphere of Mars. This report focuses on the ejecta morphologies and central pit characteristics of these craters. The results indicate that single-layer ejecta (SLE) morphology is most consistent with impact into an ice-rich target. Double-layer ejecta (DLE) and multiple-layer ejecta (MLE) craters also likely form in volatile-rich materials, but the interaction of the ejecta curtain and target-produced vapor with the thin Martian atmosphere may be responsible for the large runout distances of these ejecta. Pancake craters appear to be a modified form of double-layer craters where the thin outer layer has been destroyed or is unobservable at present resolutions. Pedestal craters are proposed to form in an ice-rich mantle deposited during high obliquity periods from which the ice has subsequently sublimated. Central pits likely form by the release of vapor produced by impact into ice-soil mixed targets. Therefore, results from the present study are consistent with target volatiles playing a dominant role in the formation of crater morphologies found in the Martian northern hemisphere.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    1945-5100
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1945-5100.2006.tb00427.x
    Scopus Count
    Collections
    Meteoritics & Planetary Science, Volume 41, Number 10 (2006)

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