The high-pressure phase relation of the MgSO4-H2O system and its implication for the internal structure of Ganymede

Ryo Nakamura, Eiji Ohtani

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We have determined the phase relation of the MgSO4-H2O binary system using an externally heated diamond anvil cell in the compositional range of 0-30 wt.% MgSO4, and under temperature and pressure conditions from 298 to 500K and up to 4.5GPa. Using our experimental results, we were able to estimate the composition of the ice mantle of the large icy satellites of Jupiter, such as Ganymede.In our experiments, we identified the following phases in the MgSO4-H2O system up to 4GPa at 298K: Ices VI and VII, magnesium heptahydrate, MgSO4·7H2O, and a liquid phase. The present phase relations suggest that there may be a deep internal ocean down to a depth about 800km in the interior of Ganymede.

Original languageEnglish
Pages (from-to)648-654
Number of pages7
JournalIcarus
Volume211
Issue number1
DOIs
Publication statusPublished - 2011 Jan

Keywords

  • Ganymede
  • Ices
  • Satellites, Composition
  • Satellites, Dynamics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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