Nebular condensation of Ga, GE and SB and the chemical classification of iron meteorites

Details Nebular condensation of Ga, GE and SB and the chemical classification of iron meteorites Nebular condensation of Ga, GE and SB and the chemical classification of iron meteorites

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.282..790w&link_type=abstract

Nature, vol. 282, Dec. 20-27, 1979, p. 790-793. NASA-supported research.

Computer Science

11

Iron Meteorites, Meteoritic Composition, Nebulae, Antimony, Astatine, Chlorine Compounds, Condensates, Copper, Fractionation, Gallium, Germanium, Gold, Graphs (Charts), Solidification, Sulfur Compounds, Meteorites, Iron Meteorites, Concentrations, Solar Nebula, Data, Condensation, Temperatures, Siderophile Elements, Volatile Elements, Crystallization, Gallium, Germanium, Antimony, Fractionation, Core, Ratio, Abundance

Scientific paper

The quantization of the Ga and Ge contents in iron meteorites, which is used as a key parameter in the chemical classification of iron meteorites, is discussed in terms of nebular condensation. The calculation of nebular equilibrium condensation is examined, taking into account the dependence of the activity coefficient on temperature and composition, and recent calculations of the condensation temperatures of Ga, Ge, Sb, Au, As and Cu are presented, noting that Ge is the most volatile siderophile, followed by Ga and Sb. The narrow intragroup ranges of Ga and Ge are interpreted in terms of minimal fractionation during core crystallization, while the larger ranges of Sb are attributed to its significantly smaller solid/liquid distribution coefficient in IIIAB meteorites.

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