Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p41a0190d&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P41A-0190
Physics
5430 Interiors (8147), 6225 Mars
Scientific paper
Extensive signs of past water exist on the Martian surface. While many experiments have been performed on hydrated terrestrial compositions, it is only recently that such experiments have been applied to Mars. High- pressure experiments were performed in a piston cylinder apparatus using a synthetic composition of Martian meteorite Yamato 980459, with 0.5 weight percent H2O added. This composition was chosen because it is a very primitive meteorite, and experiments suggest that it may represent a primary melt of the Martian mantle. The addition of 0.5 weight percent H2O lowered the liquidus temperature and decreased the slope of the liquidus slightly. Four phase assemblages were observed: 1) liquid, 2) olivine + liquid, 3) olivine + orthopyroxene + liquid, and 4) orthopyroxene + pigeonite + liquid. The multiple saturation point could exist at a higher pressure than the anhydrous experiments, indicating a hydrated Yamato 980459-type melt could form deeper within the Martian mantle.
Dalton Heather A.
Hervig Richard L.
Holloway John R.
Sharp Thomas G.
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