Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 15, Pages 3819-3824Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50778
Keywords
double-layered ejecta crater; DLE formation model; Rampart crater; Mars glaciation; Mars impact cratering; ice impact
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Funding
- NASA Mars Data Analysis Program [NNX09A146G]
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A class of Martian impact craters with particularly unusual ejecta characteristics (double-layered ejecta (DLE) craters) are preferentially located in the midlatitudes in both hemispheres of Mars. Unlike today, decameters thick deposits of snow and ice occupied these same latitudes for significant periods during the Amazonian period. We assess the hypothesis that the unusual double-layer morphology could be related to impact into a snow and ice glacial substrate followed by landsliding of ejecta off of the structurally uplifted rim. We find that many characteristics of DLE craters (e.g., latitudinal distribution, lack of secondaries, landslide-like textures, evidence for overthrusting, relation to other crater types, etc.) are consistent with such an origin.
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