Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4404k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4404
Mathematics
Logic
Scientific paper
Mars Orbiter Camera (MOC) onboard Mars Global Surveyor (MGS) produced a huge set of high-resolution images. We systematically used the MOC images of the terrains surrounding the north polar cap of Mars to study the most recent history of depositional and erosional processes in the region. Vast plains in the region are covered with a-few-m-thick continuous layer having a very characteristic surface texture ("high latitude layer", HLL). Extension of this layer approximately corresponds to the high hydrogen content detected with the Mars Odyssey gamma ray and neutron spectrometers. At highest latitudes (>70 deg), this layer is eroded only at steep slopes, which is natural for the ice-cemented material, because the slopes are the warmest places at these latitudes. Below 55 deg latitude, the HLL is often eroded and dissected, and its characteristic texture is preserved on the north-facing (colder) slopes and in local lows only. In the 55 - 65 deg zone there are localities where the HLL is disrupted by fresh collapse pits. In some images there are scattered fresh sharp pits, which probably represent an accumulation population of impact craters. The age corresponding to this crater population, though very uncertain, is on the order of 1 Myr. Few impact craters disrupt the layer at higher latitudes. In the vicinity of the polar cap the HLL is overlain by icy layered deposits (LD) of the polar cap outliers and by dunes and dune fields of different morphological types. Dune passage does not alter the HLL texture, which indicates the strength of HLL material. In some locations the erosion of the LD predates dune passage, while in other location the LD erosion exhumes dunes, whose migration predates the deposition of LD. Erosion of LD exposing their layered structure is typical for the south-facing slopes of LD patches. Although both LD and HLL presumably contain much water ice, and the ice sublimation must be their main eroding agent, the erosional patterns of the LD and the HLL are very different.
Head James W.
Kreslavsky Mikhail A.
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