Europium isotopic variations in Allende CAIs and the nature of mass-dependent fractionation in the solar nebula

Details Europium isotopic variations in Allende CAIs and the nature of mass-dependent fractionation in the solar nebula Europium isotopic variations in Allende CAIs and the nature of mass-dependent fractionation in the solar nebula

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.4287m&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 70, Issue 16, p. 4287-4294.

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We measured the 153Eu/151Eu ratio by MC-ICP-MS for a terrestrial basalt, two terrestrial soils, and four meteorites (whole rocks and/or chondrules of Bjurböle, Forest City, Murchison, and Allende) and found no isotopic variations. By contrast, two CAI separates from two different pieces of Allende show a 153Eu deficit of up to one per mil. Such a shortage in the heavy isotopes, which had also been identified in Allende CAIs for Sr [Patchett, P.J. 1980b. Sr isotopic fractionation in Allende chondrules: a reflection of solar nebular processes. Earth Planet. Sci. Lett.50, 181 188], cannot reflect evaporative fractionation. The lack of Sm isotope fractionation in the same samples further makes fractionation by purely kinetic processes an unlikely cause of the anomalous Eu isotopic composition. An alternative interpretation is condensation from a vapor already significantly depleted in Eu, but in such a scenario the fate of the missing material is unclear. We therefore prefer yet another interpretation, based on the low ionization potential of Eu (and Sr), in which electromagnetic separation of the ionized gas preferentially depletes the nebular gas in heavy isotopes.

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