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Poorly graphitized carbon as a new cosmothermometer for primitive extraterrestrial materialsA description is presented for the most common carbon phase in carbon-rich chondritic porous (CP) aggregate collected from the stratosphere by NASA researchers as part of the Cosmic Dust Program. An extraterrestrial origin was confirmed for the samples by microscopic examinations. The sample grains contained 45 percent carbon-rich phases and 30 percent low-temperature phases. Studies of the d002 interlayer spacing of the carbon clumps indicated that graphitization occurred at metamorphic temperatures after solar nebular condensation, yet early in solar system formation. Graphitized terrestrial materials served as a useful reference against which the CP materials were compared.
Document ID
19850059751
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rietmeijer, F. J. M.
(NASA Johnson Space Center Houston, TX, United States)
Mackinnon, I. D. R.
(Microbeam, Inc. Houston, TX, United States)
Date Acquired
August 12, 2013
Publication Date
June 27, 1985
Publication Information
Publication: Nature
Volume: 315
ISSN: 0028-0836
Subject Category
Lunar And Planetary Exploration
Accession Number
85A41902
Funding Number(s)
CONTRACT_GRANT: NAS9-17005
Distribution Limits
Public
Copyright
Other

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