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1826193692152561664
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MIT
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Copyright © 2020 The Authors. Magnetic measurements of the lunar crust and Apollo samples indicate that the Moon generated a dynamo magnetic field lasting from at least 4.2 until <2.5 billion years (Ga) ago. However, it has been unclear when the dynamo ceased. Here, we report paleomagnetic and 40Ar/39Ar studies showing that two lunar breccias cooled in a near-zero magnetic field (<0.1 μT) at 0.44 ± 0.01 and 0.91 ± 0.11 Ga ago, respectively. Combined with previous paleointensity estimates, this indicates that the lunar dynamo likely ceased sometime between ~1.92 and ~0.80 Ga ago. The protracted lifetime of the lunar magnetic field indicates that the late dynamo was likely powered by crystallization of the lunar core.
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2024-09-23T09:43:10Z
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Article
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mit-1721.1/132237
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| institution |
Massachusetts Institute of Technology
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| language |
English
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2024-09-23T09:43:10Z
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| publishDate |
2021
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| publisher |
American Association for the Advancement of Science (AAAS)
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dspace
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| spelling |
mit-1721.1/1322372021-09-21T03:56:20Z The end of the lunar dynamo Copyright © 2020 The Authors. Magnetic measurements of the lunar crust and Apollo samples indicate that the Moon generated a dynamo magnetic field lasting from at least 4.2 until <2.5 billion years (Ga) ago. However, it has been unclear when the dynamo ceased. Here, we report paleomagnetic and 40Ar/39Ar studies showing that two lunar breccias cooled in a near-zero magnetic field (<0.1 μT) at 0.44 ± 0.01 and 0.91 ± 0.11 Ga ago, respectively. Combined with previous paleointensity estimates, this indicates that the lunar dynamo likely ceased sometime between ~1.92 and ~0.80 Ga ago. The protracted lifetime of the lunar magnetic field indicates that the late dynamo was likely powered by crystallization of the lunar core. 2021-09-20T18:21:26Z 2021-09-20T18:21:26Z 2020-05-08T14:33:32Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132237 en 10.1126/sciadv.aax0883 Science Advances Creative Commons Attribution NonCommercial License 4.0 https://creativecommons.org/licenses/by-nc/4.0/ application/pdf American Association for the Advancement of Science (AAAS) Science Advances
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| spellingShingle |
The end of the lunar dynamo
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| title |
The end of the lunar dynamo
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| title_full |
The end of the lunar dynamo
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| title_fullStr |
The end of the lunar dynamo
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| title_full_unstemmed |
The end of the lunar dynamo
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| title_short |
The end of the lunar dynamo
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| title_sort |
end of the lunar dynamo
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| url |
https://hdl.handle.net/1721.1/132237
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