Magnesium isotopic fractionation of silicates produced in condensation experiments

Details Magnesium isotopic fractionation of silicates produced in condensation experiments Magnesium isotopic fractionation of silicates produced in condensation experiments

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.107..138u&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 107, no. 1, Oct. 1991, p. 138-147. Research supported by MOESC.

Physics

8

Chemical Fractionation, Condensing, Evaporation, Magnesium Isotopes, Silicates, Solar System Evolution, Abundance, Inclusions, Vacuum Furnaces

Scientific paper

The present study investigates isotopic mass fractionations for silicates produced in condensation experiments for the purpose of studying the evaporation-condensation process in the early solar nebula in connection with the isotopic data observed in various primitive materials. The silicate gas was fractionated to produce condensates at various temperatures below 1350 C down to room temperature, and the amount of isotopic mass fractionation varied considerably with the condensation temperature, Tc. The variation in the Mg-26/Mg-24 ratio with respect to the initial evaporation source, Delta-26, varies from +8 to -30 percent as Tc changes from 1350 C to room temperature. The obtained (Delta-26) - Tc relationship is explained in terms of the Rayleigh fractionation model, and the relationship indicates that the condensates fractionated isotopically toward the heavy mass with respect to the gas phase at temperatures from 700 to 1350 C. The findings show that the condensates can be fractionated both toward the heavy and light isotopes with respect to the initial source according to the fraction of the residual gas phase.

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