Charlier, Bruce L. A. and Tissot, François L. H. and Vollstaedt, Hauke and Dauphas, Nicolas and Wilson, Colin J. N. and Marquez, Ren T. (2021) Survival of presolar p-nuclide carriers in the nebula revealed by stepwise leaching of Allende refractory inclusions. Science Advances, 7 (28). Art. No. eabf6222. ISSN 2375-2548. PMCID PMC8270483. doi:10.1126/sciadv.abf6222. https://resolver.caltech.edu/CaltechAUTHORS:20210712-174527876
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Abstract
The ⁸⁷Rb-⁸⁷Sr 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 μ⁸⁴Sr (up to +80,655) and ⁸⁷Sr variations that cannot be explained by decay of ⁸⁷Rb. The extreme ⁸⁴Sr but more subdued ⁸⁷Sr anomalies are best explained by the presence of a presolar carrier enriched in the p-nuclide ⁸⁴Sr. 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 ⁸⁷Sr/⁸⁶Sr between CAIs and volatile-depleted inner solar system materials.
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| Additional Information: | © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). Submitted 8 November 2020; Accepted 27 May 2021; Published 9 July 2021. CAI samples were generously provided by D. Ebel and S. Alpert (American Museum of Natural History). B.L.A.C. thanks the late C. Douthitt for support for the analytical work at Bremen, and F.L.H.T. thanks D. McGee for providing access to his clean laboratory for sample extraction. This research was supported by a VUW Research Establishment Grant 225107 to B.L.A.C.; an NSF-EAR grant (1824002), a Crosby Postdoctoral Fellowship (from MIT), and start-up funds (provided by Caltech) to F.L.H.T.; and NASA grants 80NSSC17K0744 (Habitable Worlds), 359NNX17AE86G (LARS), NNX17AE87G, and 80NSSC20K0821 (Emerging Worlds), and NSF grant EAR-2001098 (CSEDI) to N.D. Author contributions: B.L.A.C., F.L.H.T., and N.D. designed the research. F.L.H.T. selected and extracted the samples. F.L.H.T. and R.T.M. characterized the samples. B.L.A.C. processed the samples and developed techniques with H.V. B.L.A.C. and H.V. analyzed the samples. B.L.A.C., F.L.H.T., N.D., R.T.M., and C.J.N.W. interpreted the data. B.L.A.C., F.L.H.T., and C.J.N.W. wrote the first draft of the manuscript, which was subsequently edited by all authors. The authors declare that they have no competing interests. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional date related to this paper may be requested from the authors. | ||||||||||||||||||||
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| Issue or Number: | 28 | ||||||||||||||||||||
| PubMed Central ID: | PMC8270483 | ||||||||||||||||||||
| DOI: | 10.1126/sciadv.abf6222 | ||||||||||||||||||||
| Record Number: | CaltechAUTHORS:20210712-174527876 | ||||||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210712-174527876 | ||||||||||||||||||||
| Official Citation: | B. L. A. Charlier, F. L. H. Tissot, H. Vollstaedt, N. Dauphas, C. J. N. Wilson, R. T. Marquez, Survival of presolar p-nuclide carriers in the nebula revealed by stepwise leaching of Allende refractory inclusions. Sci. Adv. 7, eabf6222 (2021) | ||||||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||||||
| ID Code: | 109779 | ||||||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||||||
| Deposited By: | Tony Diaz | ||||||||||||||||||||
| Deposited On: | 12 Jul 2021 18:08 | ||||||||||||||||||||
| Last Modified: | 19 Jul 2021 17:52 |
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