Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..553h&link_type=abstract
Lunar and Planetary Science, volume 27, page 553
Physics
1
Europa, Io, Sulfur Dioxide, Volcanism
Scientific paper
We have initiated a project to investigate solid-liquid phase equilibria and to make pressure-volume-temperature measurements of SO2 under the range of conditions in which SO2 is likely to exist in Io and Europa. Our goals are (1) to study this system at pressures from 0.1 MPa (1 bar) to 400 MPa, (2) to investigate phase equilibria in certain binary chemical systems with SO2, and (3) to apply these data to problems of magmatic processes on Io and Europa and to these satellites' early volatile evolution. In our first data run pure sulfur dioxide melted at a temperature of 206.5 K at 78.7 MPa (787 bars). (The melting point at 0.1 MPa is 197.6 K.) No subsolidus transitions were observed between 206 K and 125.6 K at pressures of 65-80 MPa. Thermal modeling suggests that SO2 should melt in Io at depths of tens to hundreds of meters (~1-10 MPa pressure) and in Europa at depths of tens of kilometers (several hundred to a thousand megapascals). On Io, liquid SO2 should tend to erupt explosively, whereas on Europa SO2 should tend to sink and form sulfuric acid solution in a subcrustal brine ocean.
Hogenboom David L.
Kargel Jeff S.
Reiter M. L.
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