Physics – Geophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...13..501m&link_type=abstract
In: Lunar and Planetary Science Conference, 13th, Houston, TX, March 15-19, 1982, Proceedings. Part 2. (A83-21281 07-91) Washing
Physics
Geophysics
Earth Core, Geochemistry, Planetary Evolution, Astronomical Models, Geophysics, High Pressure, Iron Oxides, Magnesium Oxides, Oxygen, Phase Diagrams, Phase Transformations, Silicates
Scientific paper
For a model of the formation of the earth's core involving oxygen as the principal light alloying element, calculations predict that an increasing pressure in the system FeO-MgO will result in the gradual exsolution of an almost pure, high pressure FeO(hpp) phase, leaving an iron-depleted (Fe, Mg)O rock salt phase. Assuming the earth to have accreted from the primordial solar nebula as a relatively homogeneous mixture of metallic iron and silicate-oxide phases, core segregation involving oxygen would commence at a depth where pressure is sufficiently high to cause exsolution of FeO(hpp) from the rock salt phase, and the temperature is sufficiently high to allow the formation of an Fe-FeO(hpp) melt. A gravitational instability then leads to the vertical differentiation of the earth as the molten metal sinks to form the core, and the depleted silicate material rises diapirically to form the mantle.
Jackson Ian
McCammon Catherine A.
Ringwood A. E.
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