Computer Science
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..791f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 4, pp.791-796
Computer Science
4
Scientific paper
Data for the partition of FeO and NiO between (Mg, Fe, Ni)-olivine and oxide-bearing (Fe, Ni)-monosulfide liquid at 1300 to 1395°C and low pressure have been analyzed to derive activity coefficients for FeS, NiS and NiSi 1/2 O 2 relative to literature values for FeSi 1/2 O 2 . FeS and NiS exhibit positive deviations from ideal solution in the monosulfide-oxide liquid, which vary from small for f O 2 values 1 log unit above the iron-wustite (IW) buffer to moderate for f O 2 values 0.5 log units below the fayalite-magnetite-quartz (FMQ) buffer and appear to be largely related to oxygen content. The mixing of FeS and NiS is only approximately consistent with a regular solution model. The activity coefficient of NiSi 1/2 O 2 in (Mg, Fe, Ni)-olivine is consistent with small to moderate positive deviations from ideal solution in the (Mg, Fe, Ni)-composition field of natural olivine, increasing with an increase in fayalite content and a decrease in NiSi 1/2 O 2 content. For natural olivine at 1300 to 1395°C, NiSi 1/2 O 2 is 1.1 at Fo96 and about 1.8 at Fo80.
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