Interstellar organic matter in meteorites

Details Interstellar organic matter in meteorites Interstellar organic matter in meteorites

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47.2199y&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 47, Dec. 1983, p. 2199-2216.

Other

57

Hydrogen, Interstellar Matter, Meteoritic Composition, Organic Materials, Abundance, Carbon Isotopes, Deuterium, Residues

Scientific paper

Deuterium-enriched hydrogen is present in organic matter in such meteorites as noncarbonaceous chondrites. The majority of the unequilibrated primitive meteorites contain hydrogen whose D/H ratios are greater than 0.0003, requiring enrichment (relative to cosmic hydrogen) by isotope exchange reactions taking place below 150 K. The D/H values presented are the lower limits for the organic compounds derived from interstellar molecules, since all processes subsequent to their formation, including terrestrial contamination, decrease their D/H ratios. In contrast, the D/H ratios of hydrogen associated with hydrated silicates are relatively uniform for the meteorites analyzed. The C-13/C-12 ratios of organic matter, irrespective of D/H ratio, lie well within those observed for the earth. Present findings suggest that other interstellar material, in addition to organic matter, is preserved and is present in high D/H ratio meteorites.

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