Water or ice in the Martian regolith? - Clues from rampart craters seen at very high resolution

Details Water or ice in the Martian regolith? - Clues from rampart craters seen at very high resolution Water or ice in the Martian regolith? - Clues from rampart craters seen at very high resolution

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987icar...71..268m&link_type=abstract

(NASA, Lunar and Planetary Institute, and National Air and Space Museum, MECA Conference on Mars: The Evolution of Its Climate a

Physics

44

Ejecta, Image Analysis, Mars Craters, Mars Surface, Regolith, Remote Sensing, Atmospheric Effects, High Resolution, Ice, Viking Mars Program, Water, Mars, Water, Ice, Regolith, Rampart Craters, Spacecraft Observations, Viking Missions, Orbiter, Imagery, Morphology, Ejecta, Subsidence, Physical Properties, Pressure Ridges, Terrain, Topography, Volatiles, Composition, Cerulli, Emplacement, Impacts, Fluidization, Atmosphere, Deposits, Shape, Photographs, Maps, Crater Interiors

Scientific paper

Very high resolution Viking Orbiter images (8 - 17 m per pixel) have been used to investigate the morphology of Martian rampart crater ejecta blankets and the crater interiors, with the objective of identifying the fluidizing medium for the ejecta and the physical properties of the target rock. The occurrence of well-preserved, small-scale pressure ridges and scour marks, evidence for subsidence around isolated buried blocks in partially eroded ejecta lobes, and the stability of crater walls and distal ramparts argue for ground ice being the dominant state for volatiles within the target rocks at the time of impact. Rare examples of channels (190 - 650 m wide) on the surfaces of ejecta blankets, and on the inner walls of the crater Cerulli, indicate that in some instances liquid water was incorporated into the ejecta during its emplacement.

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