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Trapped noble gases indicate lunar origin for Antarctic meteoriteThe isotopic abundances of the noble gases (He, Ne, Ar, Kr, Xe) are reported for Antarctic ALHA 81005. It contains solar wind-implanted gases whose absolute and relative concentrations are quite similar to lunar regolith samples but not to other meteorites. ALHA 81005 also contains a large excess Ar-40 component which is identical to the component in lunar fines implanted from the lunar atmosphere. Large concentrations of cosmogenic Ne-21, Kr-82, and Xe-126 in ALHA 81005 indicate a total cosmic ray exposure age of at least 200 million years. The noble gas data alone are strong evidence for a lunar origin of this meteorite.
Document ID
19830065649
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bogard, D. D.
(NASA Johnson Space Center Planetary and Earth Sciences Div., Houston, TX, United States)
Johnson, P.
(Northrop Services, Inc. Houston, TX, United States)
Date Acquired
August 11, 2013
Publication Date
September 1, 1983
Publication Information
Publication: Geophysical Research Letters
Volume: 10
ISSN: 0094-8276
Subject Category
Lunar And Planetary Exploration
Accession Number
83A46867
Distribution Limits
Public
Copyright
Other

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