Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..255g&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Feb. 1986, p. 255-263. SERC-supported research.
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4
Carbon Isotopes, Forsterite, Meteoritic Composition, Stony Meteorites, Abundance, Fractionation, Inclusions, Oxygen Isotopes, Silicates, Meteorites, Chondrites, Carbon, Isotopes, Winona, Mt. Morris, Pontlyfni, Stony Meteorites, Kakangari, Acapulco, Cumberland Falls, Metal, Nickel, Inclusions, Aurbrites, Composition, Abundance, Comparisons, Techniques, Samples, Meteorite, Procedure, Graphite, Iron
Scientific paper
Carbon content and C-isotope composition studies were conducted on the stone meteorites Winona, Mt. Morris (WI), Pontlyfni, Acapulco, and Kakangari, and on a chondritic inclusion from the Cumberland Falls aubrite, to search for similarities that might exist between these meteorites. To compare the C-release profiles, the samples were subjected to step combustion in the 200-1200 C range. The isotopic composition of released C gas was measured with a mass spectrometer. Samples from Winona, Mt. Morris, Pontlyfni, and the Cumberland Falls chondrite behave in a common fashion during combustion, with graphite being the major indigenous carbon component. Similar delta-C-13 values, which were close to the range reported for enstatite chondrites and IAB irons, indicated commonality in the origin of all these samples. Acapulco has a slightly different C distribution, with more of the element possibility still in the metal than as graphite. Both the graphite and the C in metal are isotopically lighter in the Acapulso sample than in the first meteorite group. Kakangari showed no relation to any of the other meteorites, supporting the view that this meteorite might be unique.
Grady Michael
Pillinger Colin T.
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