Computer Science
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2215s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, Sept. 1988, p. 2215-2227.
Computer Science
16
Allende Meteorite, Iodine Isotopes, Meteoritic Composition, Xenon Isotopes, Abundance, Plutonium Isotopes, Radioactive Age Determination, Uranium Isotopes
Scientific paper
The I-Xe systems of six Allende inclusions (five Eggs and the Pink Angel) appear to have been altered by nonnebular secondary processes. Evidence for this includes temperature-ordered variations in the initial I isotopic composition within several objects (with older apparent I-Xe ages associated with higher extraction temperatures) and the absence of primitive I-Xe ages. The span of apparent ages seen in Allende objects (10 Myr or more) is probably too long to reflect any nebular process, so at least some alteration probably occurred ont the parent body. The range in initial (Pu-244)/(U-238) ratios for the Eggs (0.003-0.014) includes the current best estimates of the bulk solar system value (0.004-0.007). For Egg 3, the Pu/U ratio varies by a factor of two between extractions, probably the result of fractionation of Pu from U among different phases.
Caffee Marc W.
Hohenberg Charles M.
Swindle Timothy D.
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