Metal Grains in Chondritic Meteorites

Details Metal Grains in Chondritic Meteorites Metal Grains in Chondritic Meteorites

Dec 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965natur.208.1085w&link_type=abstract

Nature, Volume 208, Issue 5015, pp. 1085-1086 (1965).

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Scientific paper

THE nickel-iron minerals taenite and kamacite in octahedrites (iron meteorites) are inhomogeneous, as shown in Fig. 1: taenite crystals are richest in nickel and kamacite crystals are poorest in nickel at the phase boundaries where they abut one another1-3. This is a natural consequence of the behaviour of nickel-iron alloy systems if they are cooled slowly and steadily, as in the interior of a planet4-10. The binary nickel-iron phase diagram predicts that beneath ~ 800° C, as temperature falls, taenite and kamacite should continuously react with one another and change in composition. Nickel concentration should increase steadily in taenite, while in kamacite at T < ~ 500° C it should decrease.

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