Computer Science
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993metic..28..637b&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 28, no. 5, p. 637-640
Computer Science
6
Glass, Impact Melts, Meteoritic Composition, Nitrogen, Rare Gases, Shergottites, Spallation, Chemical Composition, Radiogenic Materials, Space Temperature
Scientific paper
A glass separate from the LEW88516 shergottite was analyzed by step-wise combustion for N and noble gases to determine whether it contained trapped gas similar in composition to the martian atmosphere-like component previously observed in lithology C of EETA79001. Excesses of Ar-40 and Xe-129 were in fact observed in this glass, although the amounts of these excesses less than or = to 20% of those seen in the latter meteorite, and are comparable to the amounts seen in whole-rock analyses of LEW88516. The isotopic composition of N in LEW88516 does not show an enrichment in delta N-15 commensurate with the amount of isotopically-heavy N expected from the noble gases excesses. One must posit some extreme assumptions about the nature of the N components present in LEW88516 in order to allow the presence of the trapped nitrogen component. Alternatively, the N has somehow been decoupled from the noble gases, and was either never present of has been lost.
Becker Richard H.
Pepin Robert O.
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