Mathematics – Logic
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.3807c&link_type=abstract
American Astronomical Society, DPS Meeting #32, #38.07; Bulletin of the American Astronomical Society, Vol. 32, p.1067
Mathematics
Logic
Scientific paper
Europa's hydrated material, previously identified as hydrated sulfuric acid (Carlson, Johnson, and Anderson, Science 286, 97, 1999) or hydrated salt minerals (McCord et al., Science 280, 1242, 1998; J. Geophys. Res. 104, 11827, 1999) has been mapped using multiple observations by Galileo's Near Infrared Mapping Spectrometer (NIMS). A diffuse distribution, modulated by geological features, shows an enhancement on the trailing side (270 W longitude) and diminished concentration for longitudes approaching the leading side at 90 W, where there is little hydrate. The diffuse pattern is similar to sulfur ion implantation profiles estimated by R. E. Johnson et al. (Icarus 75, 423, 1988) and Pospieszalska and Johnson (Icarus 78, 1, 1989), suggesting that ion implantation provides sulfur that is then radiolyzed to produce sulfate and the observed hydrate. Increased hydrate concentrations in geological features such as lineae may result from the burial and subsequent resurfacing of implanted material by solid state convection or from an endogenic source of sulfurous material extruded to the surface. This work was supported by NASA's Jupiter System Data Analysis Program.
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