SO2-rich equatorial basins and epeirogeny of Io

Details SO2-rich equatorial basins and epeirogeny of Io SO2-rich equatorial basins and epeirogeny of Io

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...87m&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 87-89 (SEE N92-10728 01-91)

Physics

Geophysics

Abundance, Geodynamics, Io, Structural Properties (Geology), Sulfur Dioxides, Topography, Elevation, High Temperature, Histograms, Planetary Composition, Planetary Evolution, Plumes, Polar Regions

Scientific paper

Comparison of Io's large scale topography with an SO2 abundance map shows that SO2 is concentrated in equatorial topographic basins. In these basins, about 30 pct. of the surface is covered by SO2 at all elevations above the mean triaxial figure, and SO2 coverage increases with decreasing elevation to as much as 56 pct. at elevations below -1.5 km. The correlation is not good from long 240 to 360 degs where bright areas are covered by red, Pele type plume fallout, and in the polar regions where the topography is poorly known. The histogram of SO2 abundance binned by elevation appears bimodal, with a secondary concentration of SO2 at high elevations, but it is not certain that this is significant. Additional observations suggest that the basins have relatively little higher frequency topographic relief. The distribution of active plumes and hotspots show no obvious correlation with the topography. However, the Pele type plume all erupted from regions higher than the mean figure, and five of the eight Prometheus type plumes are more energetic and are associated with high temperature hotspots, whereas Prometheus type plumes are long lived and require large volatile reservoirs.

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