Other
Scientific paper
May 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..609o&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 5, pp.609-617
Other
2
Scientific paper
Observed distribution ratios of nickel between cohenite and kamacite (as obtained from the literature) indicate that the two equilibrated under different sets of isothermaluisobaric conditions in some meteorites. The range of P - T conditions corresponding to such distributions are calculated for the cases of ideal solid solutions. Lack of precise thermodynamic data and the probable nonideality of cohenite solutions permit only semi quantitative conclusions: the presence of nickel in cohenite and iron increases the pressure of stabilization of cohenite (at any temperature) by, at most, a few thousand atmospheres; calculated distribution ratio trends indicate that some cohenite will be indicative of high temperature at low pressures consistent with an asteroidal parent body, while with different distribution ratios higher pressures may be required at lower temperatures. Thus, cohenite in some meteorites may have metastably persisted during lower temperature annealing of the metal phase and not indicate high pressures at all.
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