Oxygen isotopes in eucrites, shergottites, nakhlites, and chassignites

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Achondrites, Gas Analysis, Meteoritic Composition, Mineralogy, Oxygen Isotopes, Mass Spectroscopy, Oxygen 17, Oxygen 18, Meteorites, Oxygen, Isotopes, Eucrites, Shergottites, Nakhlites, Chassignites, Analysis, Isotopic Ratios, Samples, Meteorite, Quartz, Samples, Terrestrial, Fractionation, Parent Bodies, Classification, Snc Meteorites, Magnetite, Plagioclase, Pyroxene, Ilmenite, Catalogs, Shergotty Meteorite, Lagami Meteorite, Nakhla Meteorite, Experiments, Lafayette Meteorite, Chassigny Meteorite, Brachin

Scientific paper

Oxygen isotopic analyses (O-18/O-16 and O-17/O-16) have been carried out on three shergottites, two nakhlites, two chassignites, nine eucrites, and seventeen terrestrial samples. The eucrites define a fractionation line displaced from the terrestrial line, with an O-16 excess of 0.4 per thousand. The shergottites, nakhlites, and Chassigny define another fractionation line with an O-16 deficiency of 0.6 per thousand relative to the earth. Within each of these two groups, the meteorites have been derived from a common oxygen reservoir, and perhaps a common parent body. The difference between the two groups requires separate reservoirs. Surprisingly, Brachina, previously classified as a chassignite, has an oxygen isotopic composition that lies within the eucrite group.

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