Mathematics – Logic
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14...71c&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Mathematics
Logic
12
Callisto, Ganymede, Planetary Craters, Satellite Surfaces, Cratering, Dynamic Models, Ice, Impact, Mass Flow, Satellite Imagery, Jupiter, Satellites, Callisto, Ganymede, Origin, Features, Craters, Surface, Icy Bodies, Characteristics, Comparisons, Morphology, Origin, Morphometry, Formation, Impacts, Models, Parameters, Velocity, Crust, Thermal Properties, Photographs, Size, Diameter, Hypotheses, Diagrams, Flow, Calculations, Scaling
Scientific paper
The hypothesis that palimpsests and anomalous pit craters are essentially pristine crater forms derived from high-velocity impacts and/or impacts into an ice crust with preimpact temperatures near melting is explored. The observational data are briefly reviewed, and an impact model is proposed for the direct formation of a palimpsest from an impact when the modification flow which produces the final crater is dominated by 'wet' fluid flow, as opposed to the 'dry' granular flow which produces normal craters. Conditions of 'wet' modification occur when the volume of impact melt remaining in the transient crater attains a volume comparable to the transient crater. The normal crater-palimpsest transition is found to occur for sufficiently large impacts or sufficiently fast impactors. The range of crater diameters and morphological characteristics inferred from the impact model is consistent with the observed characteristics of palimpsests and anomalous pit craters.
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