Mathematics – Logic
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2128p&link_type=abstract
American Astronomical Society, DPS meeting #28, #21.28; Bulletin of the American Astronomical Society, Vol. 28, p.1139
Mathematics
Logic
Scientific paper
Galileo images of bright terrain on Ganymede are providing important insight into the origin, structure, and stratigraphy of grooved terrain. Objectives of Galileo imaging of bright (grooved) terrain on Ganymede include understanding the nature and origin of grooves, the stratigraphic relationships of material units and groove sets, the mode of emplacement of bright terrain, and the crater size-frequency distributions of units. Galileo images of Uruk Sulcus, obtained at nearly 70 m/pixel during the first close pass of Galileo to Ganymede, indicate that ridges and grooves are pervasive. These features show a bimodal distribution of spacings, typically at about 450 and 900 meters, an order of magnitude smaller than Voyager estimates. Based on inferred ridge and trough morphologies, both horst-and-graben and tilt-block style normal faulting created the structures of grooved terrain, with an apparent change from graben to tilt-block style faulting over time. Structural relationships indicate that moderate right-lateral strike-slip displacement occurred in the region. Distinct geological units are readily apparent, and crater counts demonstrate differences in the relative ages of the subunits. Some of the units in this region which appear relatively smooth in Voyager images are identified in the Galileo images as relatively old, containing subdued ridges and grooves. There is little direct evidence for volcanic resurfacing in the Galileo images of Uruk Sulcus; instead tectonism appears to be the dominant resurfacing process in the region. Contrast variations in the Uruk Sulcus images are extreme. Perhaps because albedo variations are controlled by topography, landform morphology and structure can be recognized even at these conditions of high solar illumination. Stereo images of the Uruk Sulcus site and additional bright terrain observations from Galileo's second encounter with Ganymede are designed to permit further assessment of these preliminary interpretations.
Chapman Clark
Collins Geoffrey
Galileo Imaging Team
Gerhard Neukum
Greeley Ronald
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