Mathematics – Logic
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mpse.conf...73h&link_type=abstract
International Conference on Mars Polar Science and Exploration, p. 73
Mathematics
Logic
Mars (Planet), Mars Surface, Volcanology, Mars Craters, Ice, Equatorial Regions, Hydrology, Topography, Mars Volcanoes
Scientific paper
Three assumptions relating to the Martian hydrological budget are widely accepted: (1) rampart crater formation involved melting of a ground ice layer to produce fluidized ejecta pattern, (2) 'onset diameter' of rampart craters decreases toward polar regions, and (3) equatorial regimes on Mars are devoid of ground ice due to sublimation. This idea, i.e. of a lack of ground ice in the Martian equatorial regimes, is challenged. Thus, if rampart crater formation involved melting of a ground ice layer and this layer has subsequently been removed we are left with the inevitable corollary that break down of the ground ice layer should have produced a particular landscape. This landscape should have formed in response to melting of a variably thick ground ice layer. The variable thickness would have led to some areas subsiding more than others and thus a particular surface pattern should have emerged. However, such a pattern is not observed in vast areas with a high concentration of rampart craters. On the contrary, widespread occurrence of rampart craters set in 'unaffected' regions suggests that substantial fossil ground ice still resides at depth in between the rampart craters in equatorial Mars. The observation that large onset diameters tend to cluster in equatorial Mars may suggest that the ground ice layer is thicker there than at higher latitudes. Support for massive ground ice in present equatorial Mars comes from a morphological study of the volcano triplets: Arsia, Pavonis, and Ascraeus Mons, where it is postulated, on basis of morphological features, that substantial joekulhlaups are shaping the landscape in response to subglacial volcanism.
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