Oxygen isotopes comets

Clayton, R. N. (2004) Oxygen isotopes in meteorites. In Treatise on Geochemistry, Volume 1 Meteorites, Comets, and Planets, ed. Davis, A. M. Oxford Elsevier, pp. 129-142. 

The oxygen isotopic compositions of comet silicate grains (Fig. 12.10) resemble those of chondrites, suggesting that they formed within the solar nebula (McKeegan et al., 2006). Only one grain was found with anomalous oxygen isotopes, demonstrating its extrasolar... 

Oxygen isotopic compositions (relative to standard mean ocean water, SMOW) of several mineral grains in three Stardust particles, each grain denoted by a separate symbol. Open circles are from a CAI comet particle. After McKeegan et al. (2006). 

To date, there exists very little quantitative information concerning oxygen isotope compositions in major solar system reservoirs that is obtained by remote (spectroscopic) observation or spacecraft measurements. A measurement of water ice from comet P/Halley, made by the Giotto mission, yields = 12 75 %o (Balsiger et al. 1995 Eberhardt et al. 1995) but no measurement of is available. Precise data are obtained for the Moon, of course, from returned Apollo samples, and the oxygen isotope composition of Mars and the largest asteroid, Vesta, may be inferred from laboratory... 

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