Evidence of presolar SiC in the Allende Curious Marie calcium–aluminium-rich inclusion
Abstract
Calcium–aluminium-rich inclusions (CAIs) are one of the first solids to have condensed in the solar nebula, while presolar grains formed in various evolved stellar environments. It is generally accepted that CAIs formed close to the Sun at temperatures above 1,500 K, where presolar grains could not survive, and were then transported to other regions of the nebula where the accretion of planetesimals took place. In this context, a commonly held view is that presolar grains are found solely in the fine-grained rims surrounding chondrules and in the low-temperature fine-grained matrix that binds the various meteoritic components together. Here we demonstrate, on the basis of noble gas isotopic signatures, that presolar SiC grains were incorporated into fine-grained CAIs in the Allende carbonaceous chondrite at the time of their formation, and have survived parent-body processing. This finding provides new clues on the conditions in the nascent Solar System at the condensation of the first solids.
Additional Information
© 2020 Springer Nature Limited. Received 05 March 2019; Accepted 06 December 2019; Published 27 January 2020. We are grateful to D. Nakashima and A. Nguyen for the constructive and thorough review and for the help provided during the editorial process. We thank P. Heck, J. Holstein, and the Robert A. Pritzker Center for Meteoritics and Polar Studies at the Field Museum for providing the Curious Marie specimen (catalogue number ME3364-3.2). This work was supported by NASA grant 80NSSC19K0508 to O.P.; a Crosby Postdoctoral Fellowships (MIT), NSF-EAR grant 1824002, and start-up funds provided by Caltech to F.L.H.T.; by NASA grants NNX17AE86G (LARS), NNX17AE87G 531 (Emerging Worlds) and 80NSSC17K0744 (Habitable Worlds) to N.D. Data availability: The data that support the plots within this paper and other findings of this study are provided in the Supplementary Information as Supplementary Tables 1‒4, and are also available from the corresponding author upon reasonable request. Author Contributions: O.P designed the study, conducted the noble gas analyses, treated the data and wrote the first draft of the paper. F.L.H.T. selected, prepared and characterized the studied sample. O.P. and S.A. interpreted the data. N.D. critically contributed to the paper presentation. All the authors contributed to the discussion of the results and commented on the manuscript. The authors declare no competing interests. Peer review information: Nature Astronomy thanks Daisuke Nakashima, Ann Nguyen and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.Attached Files
Accepted Version - nihms-1546027.pdf
Supplemental Material - 41550_2019_1000_MOESM1_ESM.pdf
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Additional details
- Alternative title
- Evidence of presolar SiC in the Allende Curious Marie calcium aluminum rich inclusion
- PMCID
- PMC6999789
- Eprint ID
- 100052
- DOI
- 10.1038/s41550-019-1000-z
- Resolver ID
- CaltechAUTHORS:20191125-163016120
- NASA
- 80NSSC19K0508
- Massachusetts Institute of Technology (MIT)
- NSF
- EAR-1824002
- Caltech
- NASA
- NNX17AE86G
- NASA
- NNX17AE87G
- NASA
- 80NSSC17K0744
- Created
-
2020-01-29Created from EPrint's datestamp field
- Updated
-
2022-02-22Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences