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Laboratory simulation of meteoritic noble gases. II - Sorption of xenon on carbon: Etching and heating experimentsThe release of trapped Xe from amorphous-C phases of meteorites is simulated experimentally by HNO3 etching of carbon-black and pyrolyzed polyvinylidene chloride samples exposed to Xe-127 for 0.5-240 h at 100-1000 C and then degassed for 9 h or more at the same temperatures, as reported by Wacker et al. (1985). The results are presented in tables and graphs and characterized in detail. Samples exposed at 100-200 C are found to lose most of their Xe after etching to a depth of only about 20 pm, while those exposed at 800-1000 C exhibit a second more tightly bound component extending to a depth of 3 nm, indicative of diffusion of Xe during exposure and resembling planetary Xe. The higher noble-gas concentrations measured in meteorites are attributed to rate-controlled Xe uptake over a long period in the solar nebula.
Document ID
19850054074
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zadnik, M. G.
(Chicago Univ. Chicago, IL, United States)
Wacker, J. F.
(Chicago Univ. Chicago, IL, United States)
Lewis, R. S.
(Chicago, University Chicago, IL, United States)
Date Acquired
August 12, 2013
Publication Date
April 1, 1985
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 49
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
85A36225
Funding Number(s)
CONTRACT_GRANT: NAG9-52
CONTRACT_GRANT: NSF EAR-82-12355
Distribution Limits
Public
Copyright
Other

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