Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p42a..06h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P42A-06
Physics
5416 Glaciation, 6225 Mars
Scientific paper
Thick Amazonian-aged unconformable layered deposits in the equatorial region of Mars have been compared to current polar deposits, possibly originating in a similar manner. We continue to characterize these deposits and assess their origin. Similarities in morphology and topography include: 1) thick central deposits mantling subjacent cratered terrain and thinning toward the margins, 2) unusual smoothness of deposits at several scale lengths, 3) partially exposed impact craters, very similar to features in the south circumpolar deposits which have been partly to wholly embayed by polar deposits and then exhumed by sublimation and meltback, 4) narrow sinuous and braided ridge networks, which are often very similar to esker-like ridges in the south circumpolar deposits that are interpreted to represent subglacial melting, drainage and meltback of a former ice sheet, 5) craters marginal to the deposits which often show thick accumulations of interior layered deposits and are similar to impact craters surrounding present and previous north and south polar deposits, and 6) pedestal craters, which are similar to those found around some south circumpolar deposits. Differences include the lack of abundant distinctive spiral troughs (although candidate examples exist), and the abundance of features interpreted to represent eolian stripping (e.g., yardangs) in the equatorial unconformable deposits. These comparisons support the previous interpretation that the thick, unconformable layered deposits in the equatorial region of Mars could be remnants of ancient volatile-rich deposits. We examine two end-member hypotheses: 1) deposition during periods of high-obliquity, and 2) deposits formed from precipitation of the products of nearby equatorial outflow events.
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