Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988lastr.102...80c&link_type=abstract
L'Astronomie (ISSN 0004-6302), vol. 102, March 1988, p. 80-90. In French.
Astronomy and Astrophysics
Astronomy
Mars Surface, Permafrost, Atmospheric Pressure, Climatology, Mars Craters, Montmorillonite, Paleoclimatology, Volcanoes, Water
Scientific paper
Evidence for the presence of permafrost on Mars is presented, and models for the evolution of ice formations are discussed. Factors considered include the role of atmospheric pressure, the implications of the presence of montmorillonite, the effect of volcanic activity, and the influence of climatic variations. Results suggest that permafrost existed, at the time of meteorite impact, at a subsurface depth of 300-350 m in the equatorial zone and of 100-150 m at 40 deg latitude. Permafrost models may help explain such Martian features as the north-south hemispheric disymmetry, the contact zone, chaotic topography, polygonal formations, and valley walls.
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