Computer Science
Scientific paper
Oct 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..999r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 10, pp.999-1009
Computer Science
3
Scientific paper
Phase diagrams for the - transformation equilibria in iron-nickel alloys at high pressures have previously been calculated by the authors. The phase compositions and structures of iron meteorites are discussed in terms of the high pressure diagrams, using arguments which were first advanced by H.H. Uhlig. It is concluded that the structures of iron meteorites were developed within the pressure range 30-60 kilobars. The new 50 kilobar diagram permits the time interval for formation of the Widmanstatten texture to be less than 10 8 years, thus resolving a current controversy between advocates of high pressure and low pressure crystallization for iron meteorites. The influence of minor components, principally phosphorus, on the crystallization equilibria is also considered. The small amounts of phosphorus usually occurring in meteorites do not change the binary Fe-Ni equilibrium sufficiently to modify the principal conclusions. However, the stabilizing effect of phosphorus on the phase may account for the fact that meteoritic kamacite is slightly richer in nickel than would be expected from either the high pressure or the low pressure binary Fe--Ni phase diagram.
Kaufman Larry
Ringwood A. E.
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