Physics – Geophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..310a&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 310-312 (SEE N87-23341 16-91)
Physics
Geophysics
Geomorphology, Glaciology, Mars Surface, Permafrost, Structural Properties (Geology), Craters, Satellite Imagery, Viking Spacecraft, Volcanoes
Scientific paper
Evidence for the existence of permafrost and the surface modification due to frost effects and the presence of ice on Mars dates from early observations. Later analysis of the Viking Orbiter imagery produced evidence suggesting the former presence of ice sheets that could have played a part in shaping the surface of Mars. Similarities were pointed out between a number of streamlined Martian channel features and similar streamlined landforms created by Antarctic ice sheet movement. A study of Viking Orbiter imagery of Granicus Valles and the surrounding terrain in Elysium has produced further evidence of glaciation on Mars. Volcanism has played an important role in developing the landscapes of the Elysium region. A possible explanation is that subsidence occurred during formation of the Martian moberg ridges due to the melting of ground ice near the eruption area while at a distance most of the ground ice in the permafrost is still present and the original elevation was preserved. Meltwater during and following eruptions might be suddenly released during subglacial volcanism into Granicus Valles in one case and into Hrad Valles in the other. Fluvial erosion thus could have played a role in shaping both.
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