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Odd-looking Martian Craters Indicate Hidden Ice

Date:
January 8, 2009
Source:
American Geophysical Union
Summary:
Surface features common in the northern and southern midlatitudes of Mars and known as lobate debris aprons and lineated valley fill are believed to have formed either as debris flows mobilized by pore ice or as debris-covered glaciers.

Surface features common in the northern and southern midlatitudes of Mars and known as lobate debris aprons and lineated valley fill are believed to have formed either as debris flows mobilized by pore ice or as debris-covered glaciers.

To learn more, Kress and Head define and analyze ring mold craters, which are abundant on debris aprons and lineated valley fill but not seen in surrounding terrain. Ring mold craters are concentric crater forms named for their similarity to the cooking implement, in contrast to the bowl-shaped craters that are common at such small sizes (hundreds of meters (hundreds to thousands of feet) in diameter).

On the basis of similarities in shape of ring mold craters to laboratory impact craters in ice and of the physics of impact cratering into pure ice, the authors interpret ring mold craters to result from projectiles hitting relatively pure ice below a thin debris layer.

These results support the hypothesis that lobate debris aprons and lineated valley fill are debris-covered glaciers and that many hundreds of meters of ice remain in these deposits today on Mars.


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ailish M. Kress et al. Ring-mold craters in lineated valley fill and lobate debris aprons on Mars: Evidence for subsurface glacial ice. Geophysical Research Letters, DOI: 10.1029/2008GL035501

Cite This Page:

American Geophysical Union. "Odd-looking Martian Craters Indicate Hidden Ice." ScienceDaily. ScienceDaily, 8 January 2009. <www.sciencedaily.com/releases/2009/01/090102101328.htm>.
American Geophysical Union. (2009, January 8). Odd-looking Martian Craters Indicate Hidden Ice. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2009/01/090102101328.htm
American Geophysical Union. "Odd-looking Martian Craters Indicate Hidden Ice." ScienceDaily. www.sciencedaily.com/releases/2009/01/090102101328.htm (accessed July 31, 2014).

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