Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements
The lithospheric magnetic field is an important component of the geomagnetic field, and the oceanic lithosphere exhibits distinct characteristics. Because of its formation mechanisms, evolutionary history, and geomagnetic field polarity reversals, the oceanic lithosphere has significant remanent mag...
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Science Press
2025-05-01
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| Series: | Earth and Planetary Physics |
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| Online Access: | http://www.eppcgs.org/article/doi/10.26464/epp2025032?pageType=en |
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| author | ShiDa Sun Hui Li JinSong Du Pan Zhang Chao Chen PengFei Liu |
| author_facet | ShiDa Sun Hui Li JinSong Du Pan Zhang Chao Chen PengFei Liu |
| author_sort | ShiDa Sun |
| collection | DOAJ |
| description | The lithospheric magnetic field is an important component of the geomagnetic field, and the oceanic lithosphere exhibits distinct characteristics. Because of its formation mechanisms, evolutionary history, and geomagnetic field polarity reversals, the oceanic lithosphere has significant remanent magnetization, which causes magnetic anomaly stripes parallel to the mid-ocean ridges. However, it is difficult to construct a high-resolution lithospheric magnetic field model in oceanic regions with relatively sparse data or no data. Using forward calculated lithospheric magnetic field data based on an oceanic remanent magnetization (ORM) model with physical and geological foundations as a supplement is a feasible approach. We first collect the latest available oceanic crust age grid, plate motion model, geomagnetic polarity timescale, and oceanic lithosphere thermal structure. Combining the assumptions that the paleo geomagnetic field is a geocentric axial dipole field and that the normal oceanic crust moves only in the horizontal direction, we construct a vertically integrated ORM model of the normal oceanic crust with a known age, including the intensity, inclination, and declination. Both the ORM model and the global induced magnetization (GIM) model are then scaled from two aspects between their forward calculated results and the lithospheric magnetic field model LCS-1. One aspect is the difference in their spherical harmonic power spectra, and the other is the misfit between the grid data over the oceans. We last compare the forward calculated lithospheric magnetic anomaly from the scaled ORM and GIM models with the Macau Science Satellite-1 (MSS-1) observed data. The comparison results show that the magnetic anomalies over the normal oceanic crust regions at satellite altitude are mainly contributed by the high-intensity remanent magnetization corresponding to the Cretaceous magnetic quiet period. In these regions, the predicted and observed anomalies show good consistency in spatial distribution, whereas their amplitude differences vary across regions. This result suggests that regional ORM construction should be attempted in future work to address these amplitude discrepancies. |
| format | Article |
| id | doaj-art-b6ec85f79e8e4c9e96c03559d04dcc22 |
| institution | Kabale University |
| issn | 2096-3955 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Science Press |
| record_format | Article |
| series | Earth and Planetary Physics |
| spelling | doaj-art-b6ec85f79e8e4c9e96c03559d04dcc222025-08-20T03:53:39ZengScience PressEarth and Planetary Physics2096-39552025-05-019365366610.26464/epp2025032S22589-sunshida-FRevised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurementsShiDa Sun0Hui Li1JinSong Du2Pan Zhang3Chao Chen4PengFei Liu5Key Laboratory of Intelligent Detection and Equipment for Underground Space of Beijing-Tianjin-Hebei Urban Agglomeration, Ministry of Natural Resources, Hebei GEO University, Shijiazhuang 050031, ChinaCenter for Integrated Gravity, Magnetic, and Electrical Prospecting, Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaHubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, ChinaMacau Institute of Space Technology and Application, Macau University of Science and Technology, Macao 999078, ChinaThe lithospheric magnetic field is an important component of the geomagnetic field, and the oceanic lithosphere exhibits distinct characteristics. Because of its formation mechanisms, evolutionary history, and geomagnetic field polarity reversals, the oceanic lithosphere has significant remanent magnetization, which causes magnetic anomaly stripes parallel to the mid-ocean ridges. However, it is difficult to construct a high-resolution lithospheric magnetic field model in oceanic regions with relatively sparse data or no data. Using forward calculated lithospheric magnetic field data based on an oceanic remanent magnetization (ORM) model with physical and geological foundations as a supplement is a feasible approach. We first collect the latest available oceanic crust age grid, plate motion model, geomagnetic polarity timescale, and oceanic lithosphere thermal structure. Combining the assumptions that the paleo geomagnetic field is a geocentric axial dipole field and that the normal oceanic crust moves only in the horizontal direction, we construct a vertically integrated ORM model of the normal oceanic crust with a known age, including the intensity, inclination, and declination. Both the ORM model and the global induced magnetization (GIM) model are then scaled from two aspects between their forward calculated results and the lithospheric magnetic field model LCS-1. One aspect is the difference in their spherical harmonic power spectra, and the other is the misfit between the grid data over the oceans. We last compare the forward calculated lithospheric magnetic anomaly from the scaled ORM and GIM models with the Macau Science Satellite-1 (MSS-1) observed data. The comparison results show that the magnetic anomalies over the normal oceanic crust regions at satellite altitude are mainly contributed by the high-intensity remanent magnetization corresponding to the Cretaceous magnetic quiet period. In these regions, the predicted and observed anomalies show good consistency in spatial distribution, whereas their amplitude differences vary across regions. This result suggests that regional ORM construction should be attempted in future work to address these amplitude discrepancies.http://www.eppcgs.org/article/doi/10.26464/epp2025032?pageType=enoceanic remanent magnetizationlithospheric magnetic fieldlcs-1macau science satellite-1 |
| spellingShingle | ShiDa Sun Hui Li JinSong Du Pan Zhang Chao Chen PengFei Liu Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements Earth and Planetary Physics oceanic remanent magnetization lithospheric magnetic field lcs-1 macau science satellite-1 |
| title | Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements |
| title_full | Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements |
| title_fullStr | Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements |
| title_full_unstemmed | Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements |
| title_short | Revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to LCS-1 model and MSS-1 magnetic measurements |
| title_sort | revised global vertically integrated remanent magnetization model of the oceanic lithosphere with comparison to lcs 1 model and mss 1 magnetic measurements |
| topic | oceanic remanent magnetization lithospheric magnetic field lcs-1 macau science satellite-1 |
| url | http://www.eppcgs.org/article/doi/10.26464/epp2025032?pageType=en |
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