Other
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..455a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Feb. 1990, p. 455-468. Research supported by SERC.
Other
3
Allende Meteorite, Carbon Isotopes, Interstellar Matter, Meteoritic Composition, Combustion Products, Copper Oxides, Extraction, Hydrochloric Acid, Silicon Carbides
Scientific paper
A systematic search for isotopic compositions which might indicate the presence of interstellar grains in the Allende meteorite (other than the fine-grained diamond known to be present in this meteorite) was conducted using a method in which extended stepped combustion was followed by the isolation of an acid-insoluble residue. Two isotopically heavy carbon components were revealed. One of them, called C-aleph, has delta C-13 of 345 percent and a combustion temperature of 700-750 C. The second component (C-kappa) has delta C-13 of 527 percent and a combustion temperature of 900-1000 C. Another component, possibly C-theta, was liberated by the precombustion reaction. The discovery of these carbon components demonstrates that primitive meteorites are a rich source of interstellar grains.
Arden John W.
Ash Richard D.
Grady Michael
Pillinger Colin T.
Wright Ian P.
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