Mathematics – Logic
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1887s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 10, 1991, p. 1887-1906.
Mathematics
Logic
25
Ariel, Miranda, Morphology, Satellite Surfaces, Volcanology, Icy Satellites, Planetary Crusts, Viscous Flow, Voyager 2 Spacecraft, Uranus, Satellites, Miranda, Ariel, Volcanism, Lava Flow, Morphology, Composition, Icy Bodies, Elsinore Corona, Ridges, Topography, Viscosity, Timescale, Emplacement, Yield Strength, Width, Thickness, Silicate, Ice, Rheology, Canyons, Grooves, Plains, Water, Ammonia, Mixing, Surface, Features, Crystallization, Folding, Models, Fluid Phase, Melts, Comparisons
Scientific paper
Several types of volcanic units have been recognized on the icy Uranian satellites Miranda and Ariel. On Miranda, ridges characterized by crest grooves are up to 10 km wide and 500 m high. A continuous flat-topped flow band also 10 km wide and 500 m high forms the outer southern margin of Elsinore Corona, which appears to comprise coalesced flow bands and ridges. On Ariel, in addition to at least one ridge unit similar to those on Miranda, flood plains material has covered the floors of deep chasmata (grabens) and an irregular depression. Flows on both satellites are characterized by linear vent geometries and distinct topographic margins, which indicate extrusion of a relatively viscous material. The topography of the flows can be used to estimate flow viscosity or yield strength using a Bingham plastic model. Extrusion viscosity estimates, incorporating plausible volcanologically based emplacement time scales and a rigid crust correction, range from 10 MP to 1 GP (10 TP in the unlikely absence of a chilled crust). Viscosity estimates are dependent on the assumed emplacement time scale, however, and could be as high as 10 PP, if a solid-state-based time scale is assumed.
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