Partitioning of hydrogen between iron and ringwoodite and a potential water storages in the Martian core

Details Partitioning of hydrogen between iron and ringwoodite and a potential water storages in the Martian core Partitioning of hydrogen between iron and ringwoodite and a potential water storages in the Martian core

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr41a1776s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #MR41A-1776

Physics

3924 High-Pressure Behavior, 3954 X-Ray, Neutron, And Electron Spectroscopy And Diffraction, 6225 Mars, 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

Hydrogen is the most abundant element in the solar system. It has been proposed that the primordial Earth was covered by a hydrous magma ocean (Abe et al., 2000). In the hydrous magma ocean, metallic iron reacted with H2O and iron hydride was formed. Therefore, a large amount of hydrogen may have been transported into the Earth"fs core during core formation. In Mars, the Martian transition zone composed mainly of wadsleyite or ringwoodite, which can contain large amount of water, may directly contacts with the Martian core. The water in the transition zone minerals (wadsleyite or ringwoodite) possibly reacts with the Martian core (metallic iron). In addition, there is also a possibility that hydrous silicate mantle reacts with iron- rich core of the icy satellites, such as Ganymede. In this study, we determined the partitioning behavior of water between iron and ringwoodite, which is the major constituent hydrous mineral in the deep mantle of Earth and Mars, at 16-21 GPa and 1273 K. Experiments were carried out using a Kawai-type multianvil apparatus (SPEED 1500) together with a synchrotron X-ray radiation at BL04B1 beamline of SPring-8, Japan. The amount of hydrogen dissolved in iron hydride was estimated based on the volume expansion of iron by interstitial hydrogen atoms. The result revealed that water (hydrogen) is partitioned strongly into iron compared to ringwoodite. Therefore, the planetary core possibility contains significant amount of hydrogen and hydrogen can be classified as a "gsiderophile"h element at high pressure. Reference: Y. Abe, E. Ohtani, T. Okuchi, K, Righter, M. Drake: In Origin of of the Earth and Moon, edited by R.M. Canup, K. Righter, Arizona Univ. Press., pp 413 (2000).

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