Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater
The Martian dynamo evolution is critical for understanding Mars’s interior structure, thermal evolution, and climate change. It has been inferred to shut down at ∼4.1–4.0 Ga based on the magnetic signatures of large impact craters, but be present at ∼3.9 Ga and ∼3.7 Ga from the paleomagnetic studies...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/add3f3 |
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| author | Kuixiang Zhang Can Huang Zongyu Yue Hao Luo Jipeng Qin Dongke Chen Junyu Zhao Yasong Ge Aimin Du |
| author_facet | Kuixiang Zhang Can Huang Zongyu Yue Hao Luo Jipeng Qin Dongke Chen Junyu Zhao Yasong Ge Aimin Du |
| author_sort | Kuixiang Zhang |
| collection | DOAJ |
| description | The Martian dynamo evolution is critical for understanding Mars’s interior structure, thermal evolution, and climate change. It has been inferred to shut down at ∼4.1–4.0 Ga based on the magnetic signatures of large impact craters, but be present at ∼3.9 Ga and ∼3.7 Ga from the paleomagnetic studies and magnetic fields above volcanic units. Here, we investigate the magnetic signatures of the Iota crater, located inside the CT3-G area with a centrally strong magnetic anomaly. The Iota crater shows a weak central magnetic field with an inside-outside strength ratio of 0.39. Forward modeling is established to explore the relationship between the magnetic field signatures of craters and the magnetization caused by impact. The results show that the average magnetization of the retained materials beneath the Iota crater is about 20% of the maximum of the surroundings, indicating that the dynamo strength at that time became weak. The magnetic signatures of Iota and CT3-G reveal that the Martian dynamo decayed at ∼4.1 Ga, but did not stop completely. |
| format | Article |
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| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-809422cc922b402c8b7c0d4671fb28e92025-08-20T02:33:24ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01986214010.3847/1538-4357/add3f3Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota CraterKuixiang Zhang0https://orcid.org/0009-0001-0417-0600Can Huang1https://orcid.org/0000-0003-0223-0494Zongyu Yue2Hao Luo3Jipeng Qin4https://orcid.org/0009-0001-1596-4684Dongke Chen5Junyu Zhao6Yasong Ge7https://orcid.org/0000-0002-4345-522XAimin Du8https://orcid.org/0000-0002-0525-7898Key Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; Key Laboratory of Solar Activity and Space Weather, National Space Science Center, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaCollege of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of China; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaKey Laboratory of Deep Petroleum Intelligent Exploration and Development, Institute of Geology and Geophysics, Chinese Academy of Sciences , Beijing, People’s Republic of China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences , Beijing, People’s Republic of ChinaThe Martian dynamo evolution is critical for understanding Mars’s interior structure, thermal evolution, and climate change. It has been inferred to shut down at ∼4.1–4.0 Ga based on the magnetic signatures of large impact craters, but be present at ∼3.9 Ga and ∼3.7 Ga from the paleomagnetic studies and magnetic fields above volcanic units. Here, we investigate the magnetic signatures of the Iota crater, located inside the CT3-G area with a centrally strong magnetic anomaly. The Iota crater shows a weak central magnetic field with an inside-outside strength ratio of 0.39. Forward modeling is established to explore the relationship between the magnetic field signatures of craters and the magnetization caused by impact. The results show that the average magnetization of the retained materials beneath the Iota crater is about 20% of the maximum of the surroundings, indicating that the dynamo strength at that time became weak. The magnetic signatures of Iota and CT3-G reveal that the Martian dynamo decayed at ∼4.1 Ga, but did not stop completely.https://doi.org/10.3847/1538-4357/add3f3Magnetic anomaliesMarsImpact phenomena |
| spellingShingle | Kuixiang Zhang Can Huang Zongyu Yue Hao Luo Jipeng Qin Dongke Chen Junyu Zhao Yasong Ge Aimin Du Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater The Astrophysical Journal Magnetic anomalies Mars Impact phenomena |
| title | Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater |
| title_full | Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater |
| title_fullStr | Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater |
| title_full_unstemmed | Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater |
| title_short | Martian Dynamo Change at ∼4.1 Ga: Evidence from the Magnetic Measurements of the Iota Crater |
| title_sort | martian dynamo change at ∼4 1 ga evidence from the magnetic measurements of the iota crater |
| topic | Magnetic anomalies Mars Impact phenomena |
| url | https://doi.org/10.3847/1538-4357/add3f3 |
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