Terrestrial planet formation from lost inner solar system material
Abstract
Two fundamentally different processes of rocky planet formation exist, but it is unclear which one built the terrestrial planets of the solar system. They formed either by collisions among planetary embryos from the inner solar system or by accreting sunward-drifting millimeter-sized "pebbles" from the outer solar system. We show that the isotopic compositions of Earth and Mars are governed by two-component mixing among inner solar system materials, including material from the innermost disk unsampled by meteorites, whereas the contribution of outer solar system material is limited to a few percent by mass. This refutes a pebble accretion origin of the terrestrial planets but is consistent with collisional growth from inner solar system embryos. The low fraction of outer solar system material in Earth and Mars indicates the presence of a persistent dust-drift barrier in the disk, highlighting the specific pathway of rocky planet formation in the solar system.
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 License 4.0 (CC BY). Submitted 31 May 2021; Accepted 3 November 2021; Published 22 December 2021. We thank NASA and the Meteorite Working Group, the UNM Meteorite Museum, and the Institut für Planetologie for providing samples for this study. This work has been performed partly in preparation of the European Research Council (ERC) Advanced Grant proposal "HolyEarth" by A.M. and T.K., which is funded by the ERC (grant no. 101019380). This work was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–Project ID 263649064–TRR 170. This is TRR 170 publication no. 146. Author contributions: Conceptualization: C.B. and T.K. Methodology: C.B., A.M., G.B., J.H.R., and T.S.K. Investigation: C.B., F.S., A.M., G.B., and J.H.R. Visualization: F.S. Supervision: C.B. and T.K. Writing, original draft: C.B. and T.K. Writing, review and editing: A.M., F.S., G.B., J.H.R., and T.S.K. 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.Attached Files
Published - sciadv.abj7601.pdf
Supplemental Material - sciadv.abj7601_data_file_s1.zip
Supplemental Material - sciadv.abj7601_sm.pdf
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Additional details
- PMCID
- PMC8694615
- Eprint ID
- 112647
- Resolver ID
- CaltechAUTHORS:20220103-818852800
- 101019380
- European Research Council (ERC)
- 263649064
- Deutsche Forschungsgemeinschaft (DFG)
- Created
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2022-01-03Created from EPrint's datestamp field
- Updated
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2022-07-25Created from EPrint's last_modified field