In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede

Details In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p21a1580s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P21A-1580

Physics

[1015] Geochemistry / Composition Of The Core, [3924] Mineral Physics / High-Pressure Behavior, [3954] Mineral Physics / X-Ray, Neutron, And Electron Spectroscopy And Diffraction, [6222] Planetary Sciences: Solar System Objects / Ganymede

Scientific paper

In situ X-ray diffraction experiments on FeS-H system up to 16.5 GPa and 1723 K were carried out using a Kawai-type multianvil high-pressure apparatus with synchrotron X-ray radiation at the BL04B1 beamline of SPring-8, Japan. Hydrogen was supplied to FeS by thermal decomposition of LiAlH4 and FeSHx was formed at high pressure and temperature. Melting temperature and phase relations of FeSHx were determined based on in situ powder X-ray diffraction experiments. The melting temperature of FeSHx was reduced by 150-250 K comparing with that of pure FeS. The hydrogen concentration in FeSHx was determined to be x = 0.2-0.4 just before melting occurred between 3.0 and 16.5 GPa. Ganymede is one of the Galilean satellites of Jupiter and the largest moon in our Solar System. The Galilean mission suggested that the strongly differentiated interior of Ganymede and the presence of a liquid metallic core in Ganymede. It is considered that sulfur is the major light element in Ganymede’s core. Although the interior of Ganymede is differentiated today, the silicate rock and the iron alloy mixed with H2O and the iron alloy could react with H2O (as ice or water) or the hydrous silicate before the differentiation of Ganymede occurred at an early period, resulting in a synthesis of iron hydride. Therefore, Ganymede's core may be composed of an Fe-S-H system. According to our results, hydrogen dissolved in Ganymede's core lowers the melting temperature of the core composition, and so today, the Ganymede's core could be partially molten, solid FeSHx and liquid FeHx-FeSHx (enriched core in sulfur and hydrogen).

Affiliated with

Also associated with

No associations

Rating

In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In situ X-ray observation of melting temperature of FeS-H system under high pressure: Implications for the core of Ganymede will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1495176