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Iodine-xenon studies of Allende inclusions - Eggs and the Pink AngelThe 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.
Document ID
19890026987
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Swindle, T. D.
(Washington Univ. Saint Louis, MO, United States)
Caffee, M. W.
(Washington Univ. Saint Louis, MO, United States)
Hohenberg, C. M.
(Washington University Saint Louis, MO, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1988
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 52
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
89A14358
Funding Number(s)
CONTRACT_GRANT: NAG9-7
Distribution Limits
Public
Copyright
Other

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