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Early volatile depletion on planetesimals inferred from C-S systematics of iron meteorite parent bodies

Hirschmann, Marc M. and Bergin, Edwin A. and Blake, Geoff A. and Ciesla, Fred J. and Li, Jie (2021) Early volatile depletion on planetesimals inferred from C-S systematics of iron meteorite parent bodies. Proceedings of the National Academy of Sciences of the United States of America, 118 (13). Art. No. e2026779118. ISSN 0027-8424. PMCID PMC8020667. doi:10.1073/pnas.2026779118. https://resolver.caltech.edu/CaltechAUTHORS:20210322-144941510

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Abstract

During the formation of terrestrial planets, volatile loss may occur through nebular processing, planetesimal differentiation, and planetary accretion. We investigate iron meteorites as an archive of volatile loss during planetesimal processing. The carbon contents of the parent bodies of magmatic iron meteorites are reconstructed by thermodynamic modeling. Calculated solid/molten alloy partitioning of C increases greatly with liquid S concentration, and inferred parent body C concentrations range from 0.0004 to 0.11 wt%. Parent bodies fall into two compositional clusters characterized by cores with medium and low C/S. Both of these require significant planetesimal degassing, as metamorphic devolatilization on chondrite-like precursors is insufficient to account for their C depletions. Planetesimal core formation models, ranging from closed-system extraction to degassing of a wholly molten body, show that significant open-system silicate melting and volatile loss are required to match medium and low C/S parent body core compositions. Greater depletion in C relative to S is the hallmark of silicate degassing, indicating that parent body core compositions record processes that affect composite silicate/iron planetesimals. Degassing of bare cores stripped of their silicate mantles would deplete S with negligible C loss and could not account for inferred parent body core compositions. Devolatilization during small-body differentiation is thus a key process in shaping the volatile inventory of terrestrial planets derived from planetesimals and planetary embryos.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1073/pnas.2026779118DOIArticle
https://www.pnas.org/content/suppl/2021/03/19/2026779118.DCSupplementalPublisherSupporting Information
https://arxiv.org/abs/2104.02706arXivDiscussion Paper
http://www.ncbi.nlm.nih.gov/pmc/articles/pmc8020667/PubMed CentralArticle
ORCID:
AuthorORCID
Hirschmann, Marc M.0000-0003-1213-6645
Bergin, Edwin A.0000-0003-4179-6394
Blake, Geoff A.0000-0003-0787-1610
Ciesla, Fred J.0000-0002-0093-065X
Li, Jie0000-0003-4761-722X
Additional Information:© 2021 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND). Contributed by Marc M. Hirschmann, February 24, 2021 (sent for review December 30, 2020; reviewed by Nancy L. Chabot and Richard J. Walker). We are grateful for the detailed and helpful reviews from Nancy Chabot and Rich Walker. This research comes from an interdisciplinary collaboration funded by the Integrated NSF Support Promoting Interdisciplinary Research and Education Program through Grant AST1344133. Additional funding has been provided by National Aeronautics and Space Administration Grants 80NSSC19K0959 (to M.M.H.), XRP NNX16AB48G (to G.A.B.), and XRP 80NSSC20K0259 (to E.A.B. and F.J.C.). Data Availability: All study data are included in the article and/or supporting information. Author contributions: M.M.H. designed research; M.M.H. performed research; M.M.H., E.A.B., G.A.B., F.J.C., and J.L. analyzed data; and M.M.H., E.A.B., G.A.B., F.J.C., and J.L. wrote the paper. Reviewers: N.L.C., Johns Hopkins University Applied Physics Laboratory; and R.J.W., University of Maryland. The authors declare no competing interest. This article contains supporting information online at https://www.pnas.org/lookup/suppl/doi:10.1073/pnas.2026779118/-/DCSupplemental.
Funders:
Funding AgencyGrant Number
NSFAST-1344133
NASA80NSSC19K0959
NASANNX16AB48G
NASA80NSSC20K0259
Subject Keywords:iron meteorites; carbon; sulfur; planetary accretion; planetesimals
Issue or Number:13
PubMed Central ID:PMC8020667
DOI:10.1073/pnas.2026779118
Record Number:CaltechAUTHORS:20210322-144941510
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210322-144941510
Official Citation:Early volatile depletion on planetesimals inferred from C–S systematics of iron meteorite parent bodies. Marc M. Hirschmann, Edwin A. Bergin, Geoff A. Blake, Fred J. Ciesla, Jie Li. Proceedings of the National Academy of Sciences Mar 2021, 118 (13) e2026779118; DOI: 10.1073/pnas.2026779118
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108515
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Mar 2021 20:20
Last Modified:19 Apr 2021 21:32

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