The Rb-Sr radiochronometer provides key insights into the timing of volatile element depletion in planetary bodies, yet the unknown nucleosynthetic origin of Sr anomalies in Ca-Al-rich inclusions (CAIs, the oldest dated solar system solids) challenges the reliability of resulting chronological interpretations. To identify the nature of these Sr anomalies, we performed step-leaching experiments on nine unmelted CAIs from Allende. In six CAIs, the chemically resistant residues (0.06 to 9.7% total CAI Sr) show extreme positive μSr (up to +80,655) and Sr variations that cannot be explained by decay of Rb. The extreme Sr but more subdued Sr anomalies are best explained by the presence of a presolar carrier enriched in the -nuclide Sr. We argue that this unidentified carrier controls the isotopic anomalies in bulk CAIs and outer solar system materials, which reinstates the chronological significance of differences in initial Sr/Sr between CAIs and volatile-depleted inner solar system materials.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8270483 | PMC |
| http://dx.doi.org/10.1126/sciadv.abf6222 | DOI Listing |
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