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Noble gases in diamonds - Occurrences of solarlike helium and neonSeventeen diamond samples from diverse locations were analyzed for the contents of He, Ar, Kr, and Xe, and of their isotopes, using a Reynolds (1956) type glass mass spectrometer. The results disclosed a large spread in the He-3/He-4 ratios, ranging from values below atmospheric to close to the solar ratio. In particular, solarlike He-3/He-4 ratios were seen for an Australian colorless diamond composite and an Arkansas diamond, which also displayed solarlike neon isotopic ratios. Wide variation was also observed in the He-4/Ar-40 ratios, suggesting a complex history for the source regions and the diamond crystallization processes.
Document ID
19880032799
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Honda, M.
(California Univ. Berkeley, CA, United States)
Reynolds, J. H.
(California, University Berkeley, United States)
Roedder, E.
(USGS Reston, VA, United States)
Epstein, S.
(California Institute of Technology Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
November 10, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
88A20026
Funding Number(s)
CONTRACT_GRANT: NSF EAR-85-04096
CONTRACT_GRANT: NAG9-34
Distribution Limits
Public
Copyright
Other

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