Furrow formation on Ganymede and Callisto - New evidence from Galileo

Details Furrow formation on Ganymede and Callisto - New evidence from Galileo Furrow formation on Ganymede and Callisto - New evidence from Galileo

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28.1141p&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 141.

Mathematics

Logic

Ganymede, Callisto, Galileo Spacecraft, Tectonics, Satellite Surfaces, Terrain Analysis, Lithosphere, Planetary Evolution, Satellite Imagery, Structural Basins

Scientific paper

As some of the oldest tectonic features on Ganymede and Callisto, furrow systems can provide valuable information about the state of the lithosphere at the time of their formation and its subsequent thermal evolution. We present new results from Galileo of the furrow systems in Galileo Regio, Ganymede, and the multiring systems of the Valhalla and Asgard impact basins on Callisto. Furrows on Ganymede are found only in the older, heavily cratered dark terrain. Three main systems of furrows have been identified from Voyager data with different primary orientations and ages. Using the classification system of Murchie et al. (1990), Systems I and II are found in the anti-Jovian hemisphere, in both Marius Regio and Galileo Regio. System I furrows predate those of System II and are generally interpreted to be of impact origin. Murchie et al. suggest that these furrows are reactivated impact basin rings. Callisto possesses at least eight systems of concentric and radial fracture zones arranged around degraded palimpsests. These are interpreted to be impact structures. Cratering models indicate that furrows on Ganymede may only be 100-200 My younger than Valhalla, therefore direct morphological comparisons are reasonable.

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