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

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Abstract

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 [small delta, Greek]17 O against [small delta, Greek]18 O represents the primitive oxygen isotope reservoir of the early solar nebula. Most meteorites are enriched in17 O and18 O 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 (16) O-rich component of CAIs.

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