Existence of an 16 O-Rich Gaseous Reservoir in the Solar Nebula
- 8 February 2002
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 295 (5557) , 1051-1054
- https://doi.org/10.1126/science.1068200
Abstract
Carbonaceous chondrite condensate olivine grains from two distinct petrographic settings, calcium-aluminum–rich inclusion (CAI) accretionary rims and amoeboid olivine aggregates (AOAs), are oxygen-16 (16O) enriched at the level previously observed inside CAIs. This requires that the gas in the nebular region where these grains condensed was 16O-rich. This contrasts with an16O-poor gas present during the formation of chondrules, suggesting that CAIs and AOAs formed in a spatially restricted region of the solar nebula containing 16O-rich gas. The16O-rich gas composition may have resulted either from mass-independent isotopic chemistry or from evaporation of regions with enhanced dust/gas ratios, possibly in an X-wind environment near the young Sun.Keywords
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