Origins of Palimpsests and Impact Basins on Ganymede

Details Origins of Palimpsests and Impact Basins on Ganymede Origins of Palimpsests and Impact Basins on Ganymede

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1137s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1137

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3

Basins: Impact, Callisto, Ganymede, Palimpsests

Scientific paper

Large impact structures on icy satellites differ radically from their terrestrial planet counterparts, and in so doing reveal much about icy satellite surfaces and cratering processes. A particularly persistent puzzle has been the nature and origin of palimpsests on Ganymede and Callisto. Palimpsests, circular low albedo scars with very low relief, are prime targets for observation by Galileo. Internal structure or composition may be important in controlling crater morphology. In order to develop an up to date paradigm for palimpsest formation we have made a systematic study of large impact structures on these bodies, the first since 1982, incorporating stereo observations and extensive measurements of basin ejecta and other basin structures. We find that the outer palimpsest boundary corresponds to the inner (pedestal) ejecta facies and basin morphology changed radically with time on Ganymede, perhaps due to decreasing thermal gradients.

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