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Noble-gas-rich separates from the Allende meteoritePredominantly carbonaceous HF/HCl-resistant residues from the Allende meteorite are studied. Samples are characterized by SEM/EDXA, X-ray diffraction, INAA, C, S, H, N, and noble gas analyses. Isotopic data for carbon show variations no greater than 5%, while isotopic data from noble gases confirm previously established systematics. Noble gas abundances correlate with those of C and N, and concomitant partial loss of C and normal trapped gas occur during treatments with oxidizing acids. HF/HCl demineralization of bulk meteorite results in similar fractional losses of C and trapped noble gases, which leads to the conclusion that various macromolecular carbonaceous substances serve as the main host phase for normal trapped noble gases and anomalous gases in acid-resistant residues, and as the carrier of the major part of trapped noble gases lost during HF/HCl demineralization. Limits on the possible abundances of dense mineralic host phases in the residues are obtained, and considerations of the nucleogenetic origin for CCF-XE indicate that carbonaceous host phases and various forms of organic matter in carbonaceous meteorites may have a presolar origin.
Document ID
19820030291
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ott, U.
(California, University Berkeley, CA, United States)
Mack, R.
(California Univ. Berkeley, CA, United States)
Chang, S.
(NASA Ames Research Center Extraterrestrial Research Div., Moffett Field, CA, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1981
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 45
Subject Category
Lunar And Planetary Exploration
Accession Number
82A13826
Distribution Limits
Public
Copyright
Other

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