The cooling rates of iron meteorites - A new approach

Details The cooling rates of iron meteorites - A new approach The cooling rates of iron meteorites - A new approach

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...45..564r&link_type=abstract

Icarus, vol. 45, Mar. 1981, p. 564-576.

Computer Science

13

Cooling, Iron Meteorites, Meteoritic Composition, Nickel, Nucleation, Computerized Simulation, Density Measurement, Flux Density, Heat Flux, Metallography, Phase Diagrams, Iron Meteorites, Cooling Rates, Nickel, Concentrations, Distribution, Lamellae, Kamacite, Taenite, Cape York Meteorite, Nucleation, Models, Simulations, Computer Techniques, Photomicrographs, Analysis, Meteorites

Scientific paper

Measurements of Ni concentration profiles of a large number of neighboring kamacite and taenite lamellae in the iron meteorite Cape York (III A) have revealed that the kamacite plates have nucleated in a taenite of varying Ni concentration, equal to or above the bulk Ni concentration of the meteorite. This variation indicates that the kamacite plates nucleated in a stepwise manner (i.e., independently) during cooling through a certain temperature interval, rather than simultaneously after more or less undercooling of the meteorite. In this paper, the measured local bulk Ni concentrations are used in a computer simulation of the evolution of the Widmannstaetten pattern in order to calculate the cooling rate of the meteorite. The cooling rate obtained for Cape York is 1.3 K/million years. In most previous work, a correlation is seen between the resulting taenite width and the cooling rate in one and the same meteorite. No such correlation is seen using the present method.

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