Fractionation in the solar nebula: condensation of yttrium and the rare earth elements

Research output: Contribution to journalArticle

190 Citations (Scopus)

Abstract

The 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 (Icarus 19, 523-530 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.

Original languageEnglish (US)
Pages (from-to)569-584
Number of pages16
JournalGeochimica et Cosmochimica Acta
Volume39
Issue number5
DOIs
StatePublished - 1975
Externally publishedYes

Fingerprint

Yttrium
yttrium
Fractionation
Rare earth elements
condensation
Condensation
condensate
rare earth element
fractionation
Gases
gas
Allende meteorite
Meteorites
thermodynamics
Thermodynamics
Chemical analysis

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Fractionation in the solar nebula : condensation of yttrium and the rare earth elements. / Boynton, William V.

In: Geochimica et Cosmochimica Acta, Vol. 39, No. 5, 1975, p. 569-584.

Research output: Contribution to journalArticle

@article{6c076fd4f4194ed891884b08569d6aa4,
title = "Fractionation in the solar nebula: condensation of yttrium and the rare earth elements",
abstract = "The 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 (Icarus 19, 523-530 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.",
author = "Boynton, {William V.}",
year = "1975",
doi = "10.1016/0016-7037(75)90003-4",
language = "English (US)",
volume = "39",
pages = "569--584",
journal = "Geochmica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier Limited",
number = "5",

}

TY - JOUR

T1 - Fractionation in the solar nebula

T2 - condensation of yttrium and the rare earth elements

AU - Boynton, William V.

PY - 1975

Y1 - 1975

N2 - The 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 (Icarus 19, 523-530 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.

AB - The 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 (Icarus 19, 523-530 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.

UR - http://www.scopus.com/inward/record.url?scp=0000111231&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000111231&partnerID=8YFLogxK

U2 - 10.1016/0016-7037(75)90003-4

DO - 10.1016/0016-7037(75)90003-4

M3 - Article

AN - SCOPUS:0000111231

VL - 39

SP - 569

EP - 584

JO - Geochmica et Cosmochimica Acta

JF - Geochmica et Cosmochimica Acta

SN - 0016-7037

IS - 5

ER -