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29 March 2024
 
  » pubmed » pmid9874638

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Oxygen isotope exchange between refractory inclusion in Allende and solar nebula gas
H Yurimoto ; M Ito ; H Nagasawa ;
Date 4 Dec 1998
Journal Science, 282 (5395), 1874-7
AbstractA calcium-aluminum-rich inclusion (CAI) from the Allende meteorite was analyzed and found to contain melilite crystals with extreme oxygen-isotope composition (approximately 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.
Source PubMed, pmid9874638
Other source [GID 59164] pmid9836634
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