Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..343s&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Physics
3
Directional Solidification (Crystals), Iron Meteorites, Meteoritic Composition, Meteoritic Microstructures, Crystallography, Distribution (Property), Fractionation, Iron Alloys, Nickel Alloys, Separation, Meteorites, Iron Meteorites, Segregation, Solidification, Experiments, Laboratory Studies, Fractional Crystallization, Parent Bodies, Alloys, Iron, Nickel, Analogs, Equilibrium, Distribution, Composition, Sem, Elements, Theoretical Studies, Diagrams, Procedure, Structure, Electron Microscopy
Scientific paper
A directional solidification technique was developed and applied to the problem of fractional crystallization of an iron meteorite parent body. Samples of Fe-Ni alloys close to meteorite compositions and containing S, P, and C were made. The solidified structures contain secondary phases such as sulphides within the pro-eutectic single crystal austenite (taenite). As a result of these experiments, we propose that the secondary phases observed in iron meteorites were formed during primary solidification of austenite (taenite). The measured composition profiles of Ni, P and C in the alloys were used to explain the elemental distribution within a chemical group of iron meteorites. An analytical procedure was applied to determine the equilibrium distribution coefficients as a function of fraction solidified for Ni and P from the composition profiles. The distribution coefficients of Ni and P agree with previous values. These distribution coefficients are of particular interest in the determination of the elemental distributions in iron meteorites.
Goldstein Joseph I.
Sellamuthu R.
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