Cooling rates of IIIAB iron meteorites

Details Cooling rates of IIIAB iron meteorites Cooling rates of IIIAB iron meteorites

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...80..315r&link_type=abstract

Icarus (ISSN 0019-1035), vol. 80, Aug. 1989, p. 315-325. Research supported by Statens Naturvidenskabelige Forskningsrad and Hen

Computer Science

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Cooling, Iron Meteorites, Meteoritic Composition, Nickel, Phase Diagrams, Phosphorus, X Ray Analysis, X Ray Spectra, Meteorites, Iron Meteorites, Cooling, Iiiab Irons, Samples, Meteorite, Laboratory Studies, Catalog, Parent Bodies, Procedure, Nickel, Kamacite, Computer Methods, Simulations, Nucleation, Metalography, Phosphorous, Core, Origin, Size, Radius

Scientific paper

The method of central taenite Ni content vs taenite width has been used to ascertain metallographic cooling rates for 12 Fe meteorites of group IIIAB, with experimentally determined values of the local bulk Ni and P included in the calculations as input parameters. No indications of undercooling are found in any of the meteorites thus investigated; the cooling rates are found to remain constant through the group, thereby suggesting a core origin for group IIIAB. The group's 49 K/yr average cooling rate corresponds to a parent body radius of 25 + or - 7 km. A tentative interpretation of nucleation history which reflects the parent body's early impact history is proposed.

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