Elemental and Isotope Fractionation of Chondrule-like Liquids

Introduction. Laboratory data on the evaporation kinetics and isotope fractionation of evaporation residues of silicate liquids exposed to vacuum or lowpressure gas of solar or dust-enriched compositions provide constraints on processes that affected the evolution of primitive inclusions in meteorites. In earlier work we focused on evaporations of Type B CAI-like liquids [1,4]. Here we will reexamine the evaporation kinetics of sodium and potassium from a chondrule-like liquid, and the isotopic fractionation of potassium of the evaporation residues. The quantities that need to be determined are the evaporation coefficients γi in the Hertz-