Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..683p&link_type=abstract
Nature, vol. 299, Oct. 21, 1982, p. 683-688. Research supported by the Institut National d'Astronomie et de Geophysique; Centre
Astronomy and Astrophysics
Astronomy
53
Ice, Jupiter Satellites, Rheology, Satellite Surfaces, Saturn Satellites, Tectonics, Callisto, Craters, Dione, Enceladus, Europa, Ganymede, Icy Satellites, Mimas, Rhea (Astronomy), Tethys, Titan, Topography, Voyager Project
Scientific paper
Voyager data for the Saturn and Jupiter icy moons are employed to develop rheological models for the tectonic movements of Ice I and high pressure ices. The tectonic features observed on the moons included large-scale lineaments which could be fractures, impact craters, and expanses of young, smooth terrain with resurfacing in some areas. Prominent features observed on Europa, Enceladus, Mimas, Tethys, Callisto, Titan, Rhea, Dione, and Ganymede are discussed. Attention is given to crater size, topography, and the problem of developing a thermal model to predict the internal dynamics of the moons to account for the tectonic features. An investigation is made of dislocation creep mechanisms for ice, and parameters which affect the creep, such as Bjerrum defects, proton rearrangement, and sand dispersed in the ice
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