Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p42a..04h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P42A-04
Mathematics
Logic
5416 Glaciation, 6225 Mars
Scientific paper
Mars polar deposits consist of Late Amazonian-aged ice (Api) overlying polar layered terrain (Apl). Considerable debate exists about the possibility of ice mobility and flow during and following the emplacement of the polar layered terrain, with many authors emphasizing the stability and lack of flow. Evidence for geologically recent advance of the south polar cap layered terrain has recently been presented on the basis of MOLA data and in this study, several additional regions show relationships that strongly suggest that craters formed near the edge of the cap and were buried by polar cap advance. These data appear to indicate that the south polar cap has been active in the geologically recent past. We outline four examples from an area between 150o and 185o W longitude and 70-77o S latitude. In this region the polar layered terrain (Apl) extends distally away from the south pole and overlies plains of Noachian and Hesperian age. Four impact craters and crater clusters occur in the underlying plains in the vicinity of the deposit margin. The northern edge of the polar layered terrain deposit is very sinuous in nature, but reasonably abrupt (over a distance of 10-20 km). Regions of maximum sinuosity occur in the vicinity of the regions where the edge of Apl intersects the large craters and clusters. These examples represent qualitative evidence for the flow of polar layered terrain over impact crater rims and down into the adjacent crater floors. If the polar layered terrain is indeed Late Amazonian in age, these observations represent additional evidence for the advance of the margins of the polar caps in relatively recent geological history. If these interpretations are correct, then this may help to account for the very young age estimates for much of the polar layered terrain on the basis of superposed craters. In addition to subsequent accumulation, ice movement would both deform and embay and cover preexisting impact craters in the polar deposits, leading to younger age estimates.
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