Non-Newtonian ice rheology and the retention of craters on Ganymede

Details Non-Newtonian ice rheology and the retention of craters on Ganymede Non-Newtonian ice rheology and the retention of craters on Ganymede

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..432t&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 432-434 (SEE N87-23341 16-91)

Physics

Geophysics

Craters, Ganymede, Land Ice, Nonnewtonian Fluids, Relaxation (Mechanics), Rheology, Temperature Gradients, Viscosity, Viscous Flow

Scientific paper

Calculations carried out for craters of varying sizes in a medium with constant temperature T = 173 K yield values for the crater relaxation time te (defined as the time required for the crater depth to become 1/e of its original value) that appear to be too small to account for the observed retention of craters on Ganymede and the other icy satellites. Such a calculation is seriously in conflict with the observed crater population of the surfaces of the icy satellites. In an attempt to reconcile this conflict, possible explanations for the much slower relaxation rate of craters on the icy satellites are considered. It is possible that an admixture of silicates in the surface ice regions of the icy satellites may raise the viscosity to some extent. This possible explanation and others are briefly discussed.

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