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I-Xe systematics in LL chondritesA stepwise heating analysis of Ar and Xe data from five neutron-irradiated whole rock LL chondrites (Soko Banja, Alta Ameen, Tuxtuac, Guidder, and Olivenza) is presented, emphasizing the complicated thermal history of ordinary chondrites. None of the present meteorites show a well-defined (Ar-40)-(Ar-39) apparent age plateau comprised of more than two release fractions. Most of the samples are found to yield well-defined high-temperature correlations between Xe-129/Xe-130 and Xe-128/Xe-130, and thus determinations of I-129/I-127 and Xe-129/Xe-130 at the time of isotopic closure for Xe. As in the case of other ordinary chondrites, the I-Xe systematics for LL chondrites correlate neither with a metamorphic grade nor with chronologies based opon other methods.
Document ID
19880057350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bernatowicz, T. J.
(Arizona Univ. Tucson, AZ, United States)
Podosek, F. A.
(Washington University Saint Louis, MO, United States)
Swindle, T. D.
(Arizona, University Tucson, United States)
Honda, M.
(Australian National University Canberra, Australia)
Date Acquired
August 13, 2013
Publication Date
May 1, 1988
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 52
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
88A44577
Funding Number(s)
CONTRACT_GRANT: NSF EAR-87-09445
CONTRACT_GRANT: NSF EAR-81-16361
CONTRACT_GRANT: NAG9-240
CONTRACT_GRANT: NAG9-55
Distribution Limits
Public
Copyright
Other

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