Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.117..265r&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 117, no. 1-2, p. 265-278.
Other
37
Carbonaceous Chondrites, Geochemistry, Solar System, Thorium Isotopes, Trace Elements, Uranium Isotopes, Abundance, Meteoritic Composition, Radioactive Isotopes, Meteorites, Stony Meteorites, Chondrites, C Chondrites, Thorium, Isna, Uranium, Trace Elements, Samples, Meteorite, Ci Chondrites, Orgueil, Ivuna, Mass Specrometry, Laboratory Studies, Element Ratios, Lance, Solar System, Abundance, Earth, Mantle, Procedure, Murray, Nogoya, Techniques, Concentration, Catalog, Murchison, Yamato Meteorites, Y74662, A
Scientific paper
Results of an analysis of Th, U, and several other trace elements in 11 carbonaceous chondrites, including the two CI chondrites Orgueil and Ivuna, by mass spectrometric isotope dilution techniques, are presented. It is shown that the negative correlation between Th/U and U cannot be explained by terrestrial contamination of systematic fractionation within the solar nebula; rather it reflects low-temperature mobilization and redistribution of U on the chondrite parent bodies or within the meteorites. Under the assumption that refractor lithophile elements in the primitive mantle have chondritic relative abundances, but are enriched by a factor of 2.5 relative to CI, Th = 72.2 ppb and U = 18.5 are obtained as primitive mantle abundances. If the earth's early mantle possessed a Th/U weight ratio of greater than 4.1, as suggested by the lead isotopes of Archean rocks, this would reflect very early terrestrial Th-U fractionation.
Jochum Klaus Peter
Rocholl Alexander
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