Mathematics – Logic
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgre..11403004b&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue E3, CiteID E03004
Mathematics
Logic
1
Planetary Sciences: Solid Surface Planets: Erosion And Weathering, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Remote Sensing, Planetary Sciences: Solid Surface Planets: Surface Materials And Properties, Planetary Sciences: Solar System Objects: Venus
Scientific paper
In order to assess the nature of crater-associated radar-dark diffuse features (DDFs) on Venus and to understand their formation and evolution, we analyzed Magellan radar roughness, emissivity, and reflectivity data in the vicinity of craters accompanied by these features. Following others, we assumed that DDFs are deposits (mantles) of ejected material emplaced during formation of the impact crater. The majority of radar-dark parabolas (the youngest DDFs) are characterized by a smooth mantle-atmosphere interface having low root-mean-square (rms) slopes on scales of 1-100 m, as derived from Magellan altimeter data. Older DDFs also often have areas with low rms slopes, suggesting that the mantle rms slopes can be preserved for geologically long periods of time. Some parabolas and older DDFs have asymmetric small-scale (decimeter-scale) relief that is interpreted to be dunes that formed as a result of eolian processes. This implies that the mantle material is mobile and can saltate under the influence of wind action. On average, aging of these features is accompanied by a decrease of mantle material dielectric permittivity. The most efficient mechanism for parabola degradation seems to be the removal of mantle material from the site of initial deposition by subsequent winds. We found a few examples of features that could be interpreted to be the result of in situ modification of the primary mantle.
Bondarenko Natalia V.
Head James W.
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