An evaluation of the methods to determine the cooling rates of iron meteorites

Details An evaluation of the methods to determine the cooling rates of iron meteorites An evaluation of the methods to determine the cooling rates of iron meteorites

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..715s&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, March 1988, p. 715-726.

Computer Science

26

Cooling, Iron Meteorites, Meteoritic Microstructures, Widmanstatten Structure, Kamacite, Nickel Compounds, Phase Diagrams, Meteorites, Iron Meteorites, Cooling, Techniques, Numercial Methods, Models, Diffusion, Phases, Patterns, Metallography, Toluca, Bristol, Tazewell, Parameters, Procedure, Laboratory Studies, Samples, Meteorite, Experiments, Comparisons, Time Scale

Scientific paper

Three techniques used in the past to determine the cooling rate of a meteorite are compared: (1) the kamacite bandwidth method of Goldstein and Short (1967), (2) the profile-matching method of Goldstein and Ogilvie (1965),and (3) the taenite central Ni content method of Wood (1964). For this purpose, a numerical model was developed, using the most recent phase diagram and diffusion coefficients, to simulate the growth of Widmanstaetten pattern in iron meteorites. The three cooling-rate-determination methods were applied to three meteorites, namely the Tazewell, the Toluca, and the Bristol. It was found that the impingement had a significant effect on the value of the measured cooling rate, making the kamacite bandwidth method, which disregards impingement, inadequate. The cooling rates estimated for the three meteorites by the Wood method are lower by a factor of 50 to 100 compared to cooling rates of Narayan and Goldstein (1985), who used the bandwidth method, and greater by a factor of 5 compared to older cooling rates.

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