Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347..655d&link_type=abstract
Nature (ISSN 0028-0836), vol. 347, Oct. 18, 1990, p. 655-658. Research supported by NASA and NSF.
Physics
69
Carbonaceous Chondrites, Evaporation Rate, Forsterite, Silicates, Thermal Vacuum Tests, Chemical Fractionation, Fractions, Heavy Ions, Refractory Materials
Scientific paper
Synthetic forsterite (Mg2SiO4) was partially evaporated in vacuum for various durations and at different temperatures. The residual charges obtained when molten Mg2SiO4 was evaporated to 12 percent of its initial mass were enriched in heavy isotopes by about 20, 30, and 15 per mil/amu for O, Mg, and Si, respectively, whereas solid forsterite evaporated to a similar residual mass fraction showed negligible fractionations. These results imply that calcium and aluminum-rich refractory inclusions in carbonaceous chondrites must have been at least partially molten in the primordial solar nebula if the observed large mass fractionation effects were caused by evaporation processes in the nebula.
Clayton Robert N.
Davis Andrew M.
Hashimoto Akihiko
Mayeda Toshiko K.
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