Mathematics – Logic
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...44..472s&link_type=abstract
(IAU, American Astronomical Society, COSPAR, University of Hawaii, and NASA, Colloquium on the Satellites of Jupiter, 5th, Kailu
Mathematics
Logic
12
Domes (Geology), Ganymede, Satellite Surfaces, Topography, Volcanoes, Warpage, Digital Simulation, Grooves, Ice, Voyager 1 Spacecraft
Scientific paper
Two formation processes are considered for two gently sloping domeshaped features on the surface of Ganymede, lying on grooved terrain and having diameters of roughly 250 km: (1) water vulcanism, triggered by a major impact, and (2) the isostatic upwarping of a crater formed in a thin crust. Numerical simulations show the volume of the domes to be consistent with eruption through fractures created by an impact that excavates partly through a thin crust. Isostatic upwarp rates calculated as a function of effective crustal temperature indicate that upwarping could also create such a dome if the impact excavated to a depth where the crust was sufficiently warm and mobile. Morphologic evidence suggests that both processes may have been important and, if either of the proposed models is correct, it is strongly implied that grooved terrain formation occurred prior to the thickening and stiffening of Ganymede's crust.
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