Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001m%26ps...36..883r&link_type=abstract
Meteoritics & Planetary Science, vol. 36, no. 6, p. 883-896
Physics
2
Scientific paper
Metallographic cooling rates have been calculated for all five members of group IIF using two different techniques. We have determined cooling rates of ~5 deg C/Ma based on Ni profiles through the taenite rim enclosing kamacite spindles. Ni profiles through the kamacite phase are less precise cooling rate indicators, but suggest a cooling rate of ~1 deg C/Ma within an order of magnitude at lower temperatures (360-400 deg C). Based on the kamacite bandwidth and the Ni profiles through the taenite we estimate that the kamacite nucleated 130-200 deg C below the temperature predicted from the phase diagram. The size of and the distance between large kamacite spindles is found to be consistent with the thermal history that we have determined on the basis of Ni profiles in kamacite and taenite. We find that previously published kamacite bandwidth cooling rates for the five group IIF members are most likely in error because of the presence of large schreibersite spindles in some kamacite spindles and because undercooling of kamacite were ignored. Contrary to previous workers we find that the metallographic cooling rates are consistent with cooling in a common core.
Haack Henning
Rasmussen Kaare L.
Ulff-Møller Finn
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