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Oxygen Isotope Exchange Between Refractory Inclusion in Allende and Solar Nebula Gas

Science  04 Dec 1998:
Vol. 282, Issue 5395, pp. 1874-1877
DOI: 10.1126/science.282.5395.1874

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Abstract

A calcium-aluminum–rich inclusion (CAI) from the Allende meteorite was analyzed and found to contain melilite crystals with extreme oxygen-isotope compositions (∼5 percent oxygen-16 enrichment relative to terrestrial oxygen-16). Some of the melilite is also anomalously enriched in oxygen-16 compared with oxygen isotopes measured in other CAIs. The oxygen isotopic variation measured among the minerals (melilite, spinel, and fassaite) indicates that crystallization of the CAI started from oxygen-16–rich materials that were probably liquid droplets in the solar nebula, and oxygen isotope exchange with the surrounding oxygen-16–poor nebular gas progressed through the crystallization of the CAI. Additional oxygen isotope exchange also occurred during subsequent reheating events in the solar nebula.

  • * To whom correspondence should be addressed. E-mail: yuri{at}geo.titech.ac.jp

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