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Inert gases in twelve particles and one 'dust' sample from Luna 16.The inert gases were measured mass-spectrometrically in 12 fragments and one dust sample from Luna 16. The fragments were classified petrologically by microscopic inspection. The major petrologic types were breccias and basalts. The He-4/Ne-20 ratio of the breccias (average 49) was systematically smaller than that of the basalts (average 78), probably because of He-Ne fractionation during or after the formation of the breccias. We suggest that the He-4/Ne-20 ratios of bulk fines in general may reflect the proportions of basaltic and breccia (plus cindery glasses) fragments in the fines. Exposure ages of four fragments are several hundred million years. The Ar-40/Ar-36 slopes of breccias and basalts are identical: 0.65.
Document ID
19720038601
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Heymann, D.
Lakatos, S.
(Rice University Houston, Tex., United States)
Yaniv, A.
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 13
Subject Category
Space Sciences
Accession Number
72A22267
Funding Number(s)
CONTRACT_GRANT: NGL-44-006-127
Distribution Limits
Public
Copyright
Other

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