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Fractionation in the solar nebula - Condensation of yttrium and the rare earth elementsThe condensation of Y and the rare earth elements (REE) from the solar nebula may be controlled by thermodynamic equilibrium between gas and condensed solids. Highly fractionated REE patterns may result if condensates are removed from the gas before condensation is complete. It is found that the fractionation is not a smooth function of REE ionic radius but varies in an extremely irregular pattern. Both Yb and Eu are predicted to be extremely depleted in the early condensate without the requirement of condensation in the divalent state. The model is discussed with respect to a highly fractionated pattern observed by Tanaka and Masuda (1973), in a pink Ca-Al-rich inclusion from the Allende meteorite and can account for the abundances of each REE determined. According to the model this inclusion represents a condensate from a previously fractionated gas rather than from a gas of solar composition. Before the condensation of this inclusion, an earlier condensate was formed and was removed from equilibrium with the gas.
Document ID
19750051000
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Boynton, W. V.
(Oregon State University Corvallis, Ore., United States)
Date Acquired
August 8, 2013
Publication Date
May 1, 1975
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 39
Subject Category
Lunar And Planetary Exploration
Accession Number
75A35072
Funding Number(s)
CONTRACT_GRANT: NGL-38-002-020
Distribution Limits
Public
Copyright
Other

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