A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization
The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal-silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest that crystallization of these cores generated dynamo magnetic fields. Here we descri...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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American Geophysical Union (AGU)
2022
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| Online Access: | https://hdl.handle.net/1721.1/140396 |
| _version_ | 1826194940045033472 |
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| author | Maurel, Clara Bryson, James F. J. Shah, Jay Chopdekar, Rajesh V. T. Elkins‐Tanton, Linda A. Raymond, Carol 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 F. J. Shah, Jay Chopdekar, Rajesh V. T. Elkins‐Tanton, Linda A. Raymond, Carol Weiss, Benjamin P. |
| author_sort | Maurel, Clara |
| collection | MIT |
| description | The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal-silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest that crystallization of these cores generated dynamo magnetic fields. Here we describe the magnetic history of the partially differentiated IIE iron meteorite parent body. This is the first planetesimal for which we have a time-resolved paleomagnetic record constrained by 40Ar/39Ar chronometry spanning several tens of million years (Ma). We find that the core of the IIE parent body generated a dynamo, likely powered by core crystallization, starting before 78 ± 13 Ma after solar system formation and lasting at least 80 Ma. Such extended core crystallization suggests that the core composed a substantial fraction of the body ( urn:x-wiley:00948276:media:grl61991:grl61991-math-0001 13%–19% core-to-body radius ratio depending on the body’s radius), indicating efficient core formation within some partially differentiated planetesimals. |
| first_indexed | 2024-09-23T10:04:33Z |
| format | Article |
| id | mit-1721.1/140396 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:04:33Z |
| publishDate | 2022 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1403962024-06-07T18:52:26Z A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization Maurel, Clara Bryson, James F. J. Shah, Jay Chopdekar, Rajesh V. T. Elkins‐Tanton, Linda A. Raymond, Carol Weiss, Benjamin P. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting that led to metal-silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest that crystallization of these cores generated dynamo magnetic fields. Here we describe the magnetic history of the partially differentiated IIE iron meteorite parent body. This is the first planetesimal for which we have a time-resolved paleomagnetic record constrained by 40Ar/39Ar chronometry spanning several tens of million years (Ma). We find that the core of the IIE parent body generated a dynamo, likely powered by core crystallization, starting before 78 ± 13 Ma after solar system formation and lasting at least 80 Ma. Such extended core crystallization suggests that the core composed a substantial fraction of the body ( urn:x-wiley:00948276:media:grl61991:grl61991-math-0001 13%–19% core-to-body radius ratio depending on the body’s radius), indicating efficient core formation within some partially differentiated planetesimals. 2022-02-16T15:06:14Z 2022-02-16T15:06:14Z 2021-02-11 Article http://purl.org/eprint/type/JournalArticle 0094-8276 1944-8007 https://hdl.handle.net/1721.1/140396 Maurel, C., Bryson, J. F. J., Shah, J., Chopdekar, R. V., Elkins-Tanton, L. T., Raymond, C. A., & Weiss, B. P. (2021). A long-lived planetesimal dynamo powered by core crystallization. Geophysical Research Letters, 48, e2020GL091917. en http://dx.doi.org/10.1029/2020gl091917 Geophysical Research Letters Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf American Geophysical Union (AGU) Wiley |
| spellingShingle | Maurel, Clara Bryson, James F. J. Shah, Jay Chopdekar, Rajesh V. T. Elkins‐Tanton, Linda A. Raymond, Carol Weiss, Benjamin P. A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title | A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title_full | A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title_fullStr | A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title_full_unstemmed | A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title_short | A Long‐Lived Planetesimal Dynamo Powered by Core Crystallization |
| title_sort | long lived planetesimal dynamo powered by core crystallization |
| url | https://hdl.handle.net/1721.1/140396 |
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