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  • Hongyi Wang, Shuo Yao, Zelin Li, Lianghui Guo, Jing Yang, Changli Yao, Yuan Fang and Zhaojin Rong. 2024: Magnetized Magma Intrusion being Sources of a Weak and a Strong Lunar Magnetic Anomaly Revealed by 3D Distribution of Magnetization. Earth and Planetary Physics. DOI: 10.26464/epp2024040
    Citation: Hongyi Wang, Shuo Yao, Zelin Li, Lianghui Guo, Jing Yang, Changli Yao, Yuan Fang and Zhaojin Rong. 2024: Magnetized Magma Intrusion being Sources of a Weak and a Strong Lunar Magnetic Anomaly Revealed by 3D Distribution of Magnetization. Earth and Planetary Physics. DOI: 10.26464/epp2024040
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Magnetized Magma Intrusion being Sources of a Weak and a Strong Lunar Magnetic Anomaly Revealed by 3D Distribution of Magnetization

  • This work aims to investigate the origin of the magnetic carriers in lunar crust and the intensity of the ancient dynamo field. Magnetization and depth range of magnetic carriers are studied under a weak and a strong magnetic anomaly in Mare Tranquillitatis and in Oceanus Procellarum respectively, where the surface ages are 3.6 and 3.3 billion years. A sophisticated 3D amplitude inversion software from geophysical survey is used to reconstruct the distributions of magnetization in lunar crust . Since there is no globally measured surface magnetic field for the Moon, a crustal magnetic anomaly model with a grid resolution of 0.2° is used. The depth range of the magnetic source is fixed by the boundary identified by a relative criterion, which is 20% of the recovered maximum magnetization. The central burial depth of the magnetic carriers, is about 15 km and 25 km under Reiner Gamma and Mare Tranquillitatis. The volumes of the two magnetic sources are at the scales of 104 and 105 km3, respectively. The above differences may imply hotter crust under Reiner Gamma than Mare Tranquillitatis by 3.3 Ga. The results support that the magma intrusions magnetized by ancient magnetic field could be the origin of magnetic anomalies under Reiner Gamma and Mare Tranquillitatis. Compared to previous works, the maximum magnetization being 3 A/m under Reiner Gamma supports the intensity of the field being about ~μT.
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