Ion microprobe analysis of olivine in pallasite meteorites for nickel

Details Ion microprobe analysis of olivine in pallasite meteorites for nickel Ion microprobe analysis of olivine in pallasite meteorites for nickel

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..43....5r&link_type=abstract

Earth and Planetary Science Letters, vol. 43, no. 1, Apr. 1979, p. 5-12. Research supported by the Natural Environment Research

Computer Science

6

Ion Probes, Iron Meteorites, Nickel, Olivine, Abundance, Diffusion, Magnesium, Solid Phases, Temperature Effects, Thermodynamic Equilibrium, Trace Elements, Meteorites, Thermodynamics, Olivines, Microprobe Analysis, Ions, Nickel, Pallasites, Equilibrium, Temperatures, Metals, Matrix, Isotopes, Composition, Grain Size, Diffusion, Cooling Rate

Scientific paper

The ion microprobe has been used to analyse olivine in seven pallasites for Ni. The results are in the range 22-41 micrograms/gram and are significantly lower than published electron probe analyses. The olivine-metal equilibrium temperatures deduced from thermodynamic calculations are correspondingly lower, and it is likely that equilibrium between olivine and metal was maintained to somewhat below the temperature of the gamma-alpha transformation in metal (about 700 C). The results appear to be consistent with cooling rates of about 1 K/Ma derived from metal phase compositions, and certainly more so than the previous electron probe data. A Ni profile across an olivine grain in Eagle Station shows a decrease from 40 micrograms/gram at the center to 25 micrograms/gram at the edge, illustrating the effect of limited diffusion of Ni in olivine during cooling. A correlation between grain size and central Ni content was also observed in Eagle Station, the smallest grains having the lowest Ni content.

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