Journal
SCIENCE
Volume 342, Issue 6157, Pages 463-466Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1242237
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Funding
- NASA [NNX09AG93G, NNX11AB39G]
- NASA [NNX09AG93G, 117664, NNX11AB39G, 149928] Funding Source: Federal RePORTER
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Meteorites contain a wide range of oxygen isotopic compositions that are interpreted as heterogeneity in solar nebula. The anomalous oxygen isotopic compositions of refractory mineral phases may reflect a chemical fractionation process in the nebula, but there are no experiments to demonstrate this isotope effect during particle formation through gas-phase reactions. We report experimental results of gas-to-particle conversion during oxidation of silicon monoxide that define a mass-independent line (slope one) in oxygen three-isotope space of O-18/O-16 versus O-17/O-16. This mass-independent chemical reaction is a potentially initiating step in nebular meteorite formation, which would be capable of producing silicate reservoirs with anomalous oxygen isotopic compositions.
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