Oxygen Reservoirs in the Early Solar Nebula Inferred from an Allende CAI

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Science  16 Oct 1998:
Vol. 282, Issue 5388, pp. 452-455
DOI: 10.1126/science.282.5388.452

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Ultraviolet laser microprobe analyses of a calcium-aluminum–rich inclusion (CAI) from the Allende meteorite suggest that a line with a slope of exactly 1.00 on a plot of δ17O against δ18O represents the primitive oxygen isotope reservoir of the early solar nebula. Most meteorites are enriched in 17O and 18O relative to this line, and their oxygen isotope ratios can be explained by mass fractionation or isotope exchange initiating from the primitive reservoir. These data establish a link between the oxygen isotopic composition of the abundant ordinary chondrites and the primitive 16O-rich component of CAIs.

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