Computer Science
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1199e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Aug. 1978, p. 1199-1212.
Computer Science
151
Abundance, Carbonaceous Chondrites, Chondrites, Meteoritic Composition, Rare Earth Elements, Chemical Fractionation, Condensation, Geochemistry, Chondrites, Carbonaceous Chondrites, Meteorites, Abundance, Anomalies, Fractionation, Solar System, Rare Earth Elements, Solar Nebula
Scientific paper
Fifteen chondrites, including eight carbonaceous chondrites, were analyzed for rare earth element abundances by isotope dilution. Examination of REE for a large number of individual chondrites shows that only a small proportion of the analyses have flat unfractionated REE patterns within experimental error. While some of the remaining analyses are consistent with magmatic fractionation, many patterns, in particular those with positive Ce anomalies, can not be explained by known magmatic processes. Elemental abundance anomalies are found in all major chondrite classes. The persistence of anomalies in chondritic materials relatively removed from direct condensational processes implies that anomalous components are resistant to equilibrium or were introduced at a late stage of chondrite formation. Large-scale segregation of gas and condensate is implied, and bulk variations in REE abundances between planetary bodies is possible.
Evensen Norman M.
Hamilton J. P.
Keith O'Nions R.
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