Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31a0963s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31A-0963
Mathematics
Logic
5464 Remote Sensing, 5475 Tectonics (8149), 5480 Volcanism (8450)
Scientific paper
Image data obtained by the Galileo spacecraft provide a global view of Europa at a scale of 1-km/pixel while regional scale (~100-m/pixel) data provided only limited coverage. Regional and global scale geologic studies in the vicinity of Manannán crater provide detailed unit characterizations, which provide a means to compare results based on different dataset resolutions and to make extrapolations between different parts of the satellite. The study area contains extensive outcrops of chaos materials that are characterized by various degrees of disruption, ranging from complete removal of regional plains to areas comprised of outcrops of rafted regional plains and more recent extruded deposits. In addition to widespread occurrences of chaos materials, localized cryovolcanic deposits are pervasive. Results show that local cryovolcanic activity in this area is characterized by blocky deposits and low-albedo, smooth material, suggesting eruption of low-viscosity fluids onto the surface. Larger, coherent, volcanic provinces show evidence of multiple eruptive centers and episodes of activity. We identify multiple sites of upwelling, an observation that suggests crustal thinning, "melt rough" and extrusion, rapid refreezing at the surface, and significant foundering of older plains-related "rafts." In some locations, upwelling and lateral motion has resulted in the piling up of rafts with distal fracturing and faulting possibly associated with subsurface return flow. Tectonic activity is manifested by both compressional and extensional structures. A broad, low, rise that is surmounted by en echelon segments of sinuous fractures cuts across the area. We interpret this rise to have formed under regional compression. Extension-related features are manifested by a variety of morphologies ranging from single and double ridges to ridge and broad "band" complexes. Tectonic reconstruction of some of the band materials suggests processes associated with simple lateral crustal displacement to more complex activity associated with multiple episodes of activity and reactivation of older structures. The most recently identified centers of tectonic activity appear to be associated with extensive, narrow, single, through-going fractures.
Figueredo P.
Greeley Ronald
Hare Trent
Kolb Edward
Senske David
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