Direct age constraints on the magnetism of Jack Hills zircon
<jats:p>A potential record of Earth’s magnetic field going back 4.2 billion years (Ga) ago is carried by magnetite inclusions in zircon grains from the Jack Hills. This magnetite may be secondary in nature, however, meaning that the magnetic record is much younger than the zircon crystallizati...
| Main Authors: | , , , , , , , , , , |
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| Outros autores: | |
| Formato: | Artigo |
| Idioma: | English |
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American Association for the Advancement of Science (AAAS)
2023
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| Acceso en liña: | https://hdl.handle.net/1721.1/148209 |
| _version_ | 1826211718996426752 |
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| author | Taylor, Richard JM Reddy, Steven M Saxey, David W Rickard, William DA Tang, Fengzai Borlina, Cauê S Fu, Roger R Weiss, Benjamin P Bagot, Paul Williams, Helen M Harrison, Richard J |
| 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 Taylor, Richard JM Reddy, Steven M Saxey, David W Rickard, William DA Tang, Fengzai Borlina, Cauê S Fu, Roger R Weiss, Benjamin P Bagot, Paul Williams, Helen M Harrison, Richard J |
| author_sort | Taylor, Richard JM |
| collection | MIT |
| description | <jats:p>A potential record of Earth’s magnetic field going back 4.2 billion years (Ga) ago is carried by magnetite inclusions in zircon grains from the Jack Hills. This magnetite may be secondary in nature, however, meaning that the magnetic record is much younger than the zircon crystallization age. Here, we use atom probe tomography to show that Pb-bearing nanoclusters in magnetite-bearing Jack Hills zircons formed during two discrete events at 3.4 and <2 Ga. The older population of clusters contains no detectable Fe, whereas roughly half of the younger population of clusters is Fe bearing. This result shows that the Fe required to form secondary magnetite entered the zircon sometime after 3.4 Ga and that remobilization of Pb and Fe during an annealing event occurred more than 1 Ga after deposition of the Jack Hills sediment at 3 Ga. The ability to date Fe mobility linked to secondary magnetite formation provides new possibilities to improve our knowledge of the Archean geodynamo.</jats:p> |
| first_indexed | 2024-09-23T15:10:26Z |
| format | Article |
| id | mit-1721.1/148209 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:10:26Z |
| publishDate | 2023 |
| publisher | American Association for the Advancement of Science (AAAS) |
| record_format | dspace |
| spelling | mit-1721.1/1482092023-02-27T03:08:55Z Direct age constraints on the magnetism of Jack Hills zircon Taylor, Richard JM Reddy, Steven M Saxey, David W Rickard, William DA Tang, Fengzai Borlina, Cauê S Fu, Roger R Weiss, Benjamin P Bagot, Paul Williams, Helen M Harrison, Richard J Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences <jats:p>A potential record of Earth’s magnetic field going back 4.2 billion years (Ga) ago is carried by magnetite inclusions in zircon grains from the Jack Hills. This magnetite may be secondary in nature, however, meaning that the magnetic record is much younger than the zircon crystallization age. Here, we use atom probe tomography to show that Pb-bearing nanoclusters in magnetite-bearing Jack Hills zircons formed during two discrete events at 3.4 and <2 Ga. The older population of clusters contains no detectable Fe, whereas roughly half of the younger population of clusters is Fe bearing. This result shows that the Fe required to form secondary magnetite entered the zircon sometime after 3.4 Ga and that remobilization of Pb and Fe during an annealing event occurred more than 1 Ga after deposition of the Jack Hills sediment at 3 Ga. The ability to date Fe mobility linked to secondary magnetite formation provides new possibilities to improve our knowledge of the Archean geodynamo.</jats:p> 2023-02-24T15:56:00Z 2023-02-24T15:56:00Z 2023-01-06 2023-02-24T15:16:53Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148209 Taylor, Richard JM, Reddy, Steven M, Saxey, David W, Rickard, William DA, Tang, Fengzai et al. 2023. "Direct age constraints on the magnetism of Jack Hills zircon." Science Advances, 9 (1). en 10.1126/sciadv.add1511 Science Advances Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Association for the Advancement of Science (AAAS) Science Advances |
| spellingShingle | Taylor, Richard JM Reddy, Steven M Saxey, David W Rickard, William DA Tang, Fengzai Borlina, Cauê S Fu, Roger R Weiss, Benjamin P Bagot, Paul Williams, Helen M Harrison, Richard J Direct age constraints on the magnetism of Jack Hills zircon |
| title | Direct age constraints on the magnetism of Jack Hills zircon |
| title_full | Direct age constraints on the magnetism of Jack Hills zircon |
| title_fullStr | Direct age constraints on the magnetism of Jack Hills zircon |
| title_full_unstemmed | Direct age constraints on the magnetism of Jack Hills zircon |
| title_short | Direct age constraints on the magnetism of Jack Hills zircon |
| title_sort | direct age constraints on the magnetism of jack hills zircon |
| url | https://hdl.handle.net/1721.1/148209 |
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