The magnesium sulfate-water system at pressures to 4 kilobars

Details The magnesium sulfate-water system at pressures to 4 kilobars The magnesium sulfate-water system at pressures to 4 kilobars

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept...27h&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 27-28 (SEE N92-10728 01-91)

Physics

Geophysics

Brines, Carbonaceous Chondrites, Chemical Composition, Icy Satellites, Magnesium Sulfates, Planetary Composition, Water, Asteroids, Eutectics, Gas Giant Planets, Low Pressure, Melting Points, Meteorites, Physiochemistry, Solar System

Scientific paper

Hydrated magnesium sulfate constitutes up to 1/6 of the mass of carbonaceous chondrites, and probably is important in many icy asteroids and satellites. It occurs naturally in meteorites mostly as epsomite. MgSO4, considered anhydrously, comprises nearly 3/4 of the highly soluble fraction of C1 chondrites. Thus, MgSO4 is probably an important solute in cryovolcanic brines erupted on certain icy objects in the outer solar system. While the physiochemical properties of the water-magnesium sulfate system are well known at low pressures, planetological applications of these data are hindered by a dearth of useful published data at elevated pressures. Accordingly, solid-liquid phase equilibria was recently explored in this chemical system at pressures extending to about 4 kilobars. The water magnesium sulfate system in the region of the eutectic exhibits qualitatively constant behavior between pressures of 1 atm and 2 kbar. The eutectic melting curve closely follows that for water ice, with a freezing point depression of about 4 K at 1 atm decreasing to around 3.3 K at 2 kbars. The eutectic shifts from 17 pct. MgSO4 at 1 atm to about 15.3 pct at 2 kbars. Above 2 kbars, the eutectic melting curve again tends to follow ice.

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