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Noble gases in the howardites Bholghati and KapoetaAnalyses of noble gases in whole rock samples of the howardites Bholghati and Kapoeta and grain-size separates of Kapoeta yield evidence for excesses of the Xe isotopes Xe-129 , Xe-131, Xe-132, Xe-134, and Xe-136 in a low-temperture component, similar to lunar excess fission Xe. Such a component may be able to provide chronometric information if the relative abundances of radioactive progenitors (I-129, Pu-244, and U-238) can be determined, but the isotopic spectra obtained are not sufficiently precise to do so. Eucritic clast BH-5 in Bholghati contains Xe produced in situ by the decay of Pu-244. Calculated fission Xe retention ages are 30-70 Ma after the formation of the solar system, consistent with the apparent presence of Sm-146 decay products. Both the clast and the matrix of Bholghati have K-Ar ages of about 2 Ga, suggesting a common thermal event at least that recently.
Document ID
19900059362
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Swindle, T. D.
(Arizona, University Tucson, United States)
Hohenberg, C. M.
(Arizona Univ. Tucson, AZ, United States)
Nickols, R. H.
(Arizona Univ. Tucson, AZ, United States)
Olinger, C.
(Washington University Saint Louis, MO, United States)
Garrison, D. H.
(Arizona, University Tucson, United States)
Goswami, J. N.
(Physical Research Laboratory Ahmedabad, India)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 54
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
90A46417
Funding Number(s)
CONTRACT_GRANT: NAG9-7
CONTRACT_GRANT: NAG9-240
Distribution Limits
Public
Copyright
Other

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