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16O Excesses in Olivine Inclusions in Yamato-86009 and Murchison Chondrites and Their Relation to CAIs

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Science  05 Feb 1999:
Vol. 283, Issue 5403, pp. 828-831
DOI: 10.1126/science.283.5403.828

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Abstract

In situ ion microprobe analyses of oxygen isotopes in Yamato-86009 and Murchison chondrites show that they contain abundant olivine-rich inclusions that have large oxygen-16 (16O) excesses, similar to those in spinel grains in calcium-aluminium–rich inclusions in Allende and other carbonaceous chondrites. The existence of16O-enriched olivine-rich inclusions suggests that oxygen isotopic anomalies were more extensive in the early solar system than was previously thought and that their origin may be attributed to a nebular chemical process rather than to an unidentified16O-rich carrier of presolar origin.

  • * To whom correspondence should be addressed. E-mail: hiyagon{at}geoph.s.u-tokyo.ac.jp

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