Meteorite evidence for partial differentiation and protracted accretion of planetesimals
© 2020 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). Modern meteorite classification schemes assume that no...
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| Format: | Article |
| Language: | English |
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American Association for the Advancement of Science (AAAS)
2022
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| Online Access: | https://hdl.handle.net/1721.1/133942.2 |
| _version_ | 1811095230701633536 |
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| author | Maurel, Clara Bryson, James FJ Lyons, Richard J Ball, Matthew R Chopdekar, Rajesh V Scholl, Andreas Ciesla, Fred J Bottke, William F Weiss, Benjamin P |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Maurel, Clara Bryson, James FJ Lyons, Richard J Ball, Matthew R Chopdekar, Rajesh V Scholl, Andreas Ciesla, Fred J Bottke, William F Weiss, Benjamin P |
| author_sort | Maurel, Clara |
| collection | MIT |
| description | © 2020 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). Modern meteorite classification schemes assume that no single planetary body could be source of both unmelted (chondritic) and melted (achondritic) meteorites. This dichotomy is a natural outcome of formation models assuming that planetesimal accretion occurred nearly instantaneously. However, it has recently been proposed that the accretion of many planetesimals lasted over ≳1 million years (Ma). This could have resulted in partially differentiated internal structures, with individual bodies containing iron cores, achondritic silicate mantles, and chondritic crusts. This proposal can be tested by searching for a meteorite group containing evidence for these three layers. We combine synchrotron paleomagnetic analyses with thermal, impact, and collisional evolution models to show that the parent body of the enigmatic IIE iron meteorites was such a partially differentiated planetesimal. This implies that some chondrites and achondrites simultaneously coexisted on the same planetesimal, indicating that accretion was protracted and that apparently undifferentiated asteroids may contain melted interiors. |
| first_indexed | 2024-09-23T16:13:10Z |
| format | Article |
| id | mit-1721.1/133942.2 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:13:10Z |
| publishDate | 2022 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/133942.22024-02-22T15:17:10Z Meteorite evidence for partial differentiation and protracted accretion of planetesimals Maurel, Clara Bryson, James FJ Lyons, Richard J Ball, Matthew R Chopdekar, Rajesh V Scholl, Andreas Ciesla, Fred J Bottke, William F Weiss, Benjamin P Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences © 2020 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). Modern meteorite classification schemes assume that no single planetary body could be source of both unmelted (chondritic) and melted (achondritic) meteorites. This dichotomy is a natural outcome of formation models assuming that planetesimal accretion occurred nearly instantaneously. However, it has recently been proposed that the accretion of many planetesimals lasted over ≳1 million years (Ma). This could have resulted in partially differentiated internal structures, with individual bodies containing iron cores, achondritic silicate mantles, and chondritic crusts. This proposal can be tested by searching for a meteorite group containing evidence for these three layers. We combine synchrotron paleomagnetic analyses with thermal, impact, and collisional evolution models to show that the parent body of the enigmatic IIE iron meteorites was such a partially differentiated planetesimal. This implies that some chondrites and achondrites simultaneously coexisted on the same planetesimal, indicating that accretion was protracted and that apparently undifferentiated asteroids may contain melted interiors. 2022-01-18T20:23:06Z 2021-10-27T19:57:18Z 2022-01-18T20:23:06Z 2020-07 2019-11 2021-09-22T13:52:20Z Article http://purl.org/eprint/type/JournalArticle 2375-2548 https://hdl.handle.net/1721.1/133942.2 en http://dx.doi.org/10.1126/SCIADV.ABA1303 Science Advances Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ application/octet-stream American Association for the Advancement of Science (AAAS) Science Advances |
| spellingShingle | Maurel, Clara Bryson, James FJ Lyons, Richard J Ball, Matthew R Chopdekar, Rajesh V Scholl, Andreas Ciesla, Fred J Bottke, William F Weiss, Benjamin P Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title | Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title_full | Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title_fullStr | Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title_full_unstemmed | Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title_short | Meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| title_sort | meteorite evidence for partial differentiation and protracted accretion of planetesimals |
| url | https://hdl.handle.net/1721.1/133942.2 |
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