Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986em%26p...34..177f&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 34, Feb. 1986, p. 177-188.
Other
2
Ganymede, Planetary Craters, Satellite Surfaces, Tectonics, Chronology, Cratering, Grooves, Rheology, Viscosity, Voyager 1 Spacecraft
Scientific paper
High-resolution Voyager images of the Ganymedean terrain were analyzed for distribution of the pedestal craters, in search of clues to their formation. The analysis pointed to a correlation between the craters and the grooved terrain of Ganymede, indicating that the craters were the earliest postgrooved impacts. The 'tectonized' pedestal craters are the only type of crater lying on the grooved terrain and being affected by the grooves. Assuming that a lowering of the terrain's viscosity at the time of the major bombardment is the determining factor for the presence of pedestal craters, it is concluded that at the time of their formation the grooved terrains had a lower viscosity than the other terrains. Two hypotheses for the process that lowered the viscosity of the grooved terrain seem possible: (1) an increase in the proportion of volatiles that lowers the point of fusion of the material and hence its viscosity or (2) an increase in temperature, possibly due to heating by long-lived radiogenic elements.
Forni Olivier
Masson Ph.
Thomas Pierre G.
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