The method of transitional processes in studies of geological media with magnetic viscosity
The paper discusses the effect of magnetically viscous geological materials on the TEM response. Magnetic viscosity is a property of ferromagnetism. In rocks and soils it is often associated with superparamagnetism, or magnetic relaxation of ultra-fine ferrimagnetic mineral grains. Magnetic viscosit...
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| Datum: | 2012 |
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S. Subbotin Institute of Geophysics of the NAS of Ukraine
2012
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| Назва журналу: | Geofizicheskiy Zhurnal |
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Geofizicheskiy Zhurnal| _version_ | 1856543290230308864 |
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| author | Kozhevnikov, N. O. Antonov, E. Yu. Matasova, G. G. Kamnev, Ya. K. |
| author_facet | Kozhevnikov, N. O. Antonov, E. Yu. Matasova, G. G. Kamnev, Ya. K. |
| author_sort | Kozhevnikov, N. O. |
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| collection | OJS |
| datestamp_date | 2020-10-07T12:21:33Z |
| description | The paper discusses the effect of magnetically viscous geological materials on the TEM response. Magnetic viscosity is a property of ferromagnetism. In rocks and soils it is often associated with superparamagnetism, or magnetic relaxation of ultra-fine ferrimagnetic mineral grains. Magnetic viscosity in TEM data shows itself as voltage decaying inversely proportional to the first power of time. Most often it is treated as a geologic noise that hinders inversion of TEM response in terms of electrical conductivity. On the other hand, there is evidence that magnetic viscosity effects are related to the mineralogy and history of natural and man-made geological materials. Therefore, it appears reasonable to learn how, (1) using TEM systems of different geometry, to amplify or depress the magnetic viscosity response and (2) interpret it in terms of rock magnetism. We show, through forward calculation of TEM responses, laboratory magnetic viscosity measurements both in time and frequency domains, and inversion of the field TEM data in terms of time-dependant magnetic susceptibility, how magnetic viscosity effects can be used as a source of important information on the near-surface geology. The discussed results present a first experience in applying the TEM method to purposeful investigation into magnetic relaxation of rocks. There are still a number of important issues that remain beyond this consideration and will be a subject of a special study, namely, equivalence, resolution, and influence of measurement errors on the inversion quality. |
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| institution | Geofizicheskiy Zhurnal |
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| last_indexed | 2025-07-17T11:07:43Z |
| publishDate | 2012 |
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| spelling | journalsuranua-geofizicheskiy-article-1167622020-10-07T12:21:33Z The method of transitional processes in studies of geological media with magnetic viscosity Kozhevnikov, N. O. Antonov, E. Yu. Matasova, G. G. Kamnev, Ya. K. The paper discusses the effect of magnetically viscous geological materials on the TEM response. Magnetic viscosity is a property of ferromagnetism. In rocks and soils it is often associated with superparamagnetism, or magnetic relaxation of ultra-fine ferrimagnetic mineral grains. Magnetic viscosity in TEM data shows itself as voltage decaying inversely proportional to the first power of time. Most often it is treated as a geologic noise that hinders inversion of TEM response in terms of electrical conductivity. On the other hand, there is evidence that magnetic viscosity effects are related to the mineralogy and history of natural and man-made geological materials. Therefore, it appears reasonable to learn how, (1) using TEM systems of different geometry, to amplify or depress the magnetic viscosity response and (2) interpret it in terms of rock magnetism. We show, through forward calculation of TEM responses, laboratory magnetic viscosity measurements both in time and frequency domains, and inversion of the field TEM data in terms of time-dependant magnetic susceptibility, how magnetic viscosity effects can be used as a source of important information on the near-surface geology. The discussed results present a first experience in applying the TEM method to purposeful investigation into magnetic relaxation of rocks. There are still a number of important issues that remain beyond this consideration and will be a subject of a special study, namely, equivalence, resolution, and influence of measurement errors on the inversion quality. S. Subbotin Institute of Geophysics of the NAS of Ukraine 2012-08-01 Article Article application/pdf https://journals.uran.ua/geofizicheskiy/article/view/116762 10.24028/gzh.0203-3100.v34i4.2012.116762 Geofizicheskiy Zhurnal; Vol. 34 No. 4 (2012); 137-149 Геофизический журнал; Том 34 № 4 (2012); 137-149 Геофізичний журнал; Том 34 № 4 (2012); 137-149 2524-1052 0203-3100 ru https://journals.uran.ua/geofizicheskiy/article/view/116762/110824 Copyright (c) 2020 Geofizicheskiy Zhurnal https://creativecommons.org/licenses/by/4.0 |
| spellingShingle | Kozhevnikov, N. O. Antonov, E. Yu. Matasova, G. G. Kamnev, Ya. K. The method of transitional processes in studies of geological media with magnetic viscosity |
| title | The method of transitional processes in studies of geological media with magnetic viscosity |
| title_full | The method of transitional processes in studies of geological media with magnetic viscosity |
| title_fullStr | The method of transitional processes in studies of geological media with magnetic viscosity |
| title_full_unstemmed | The method of transitional processes in studies of geological media with magnetic viscosity |
| title_short | The method of transitional processes in studies of geological media with magnetic viscosity |
| title_sort | method of transitional processes in studies of geological media with magnetic viscosity |
| url | https://journals.uran.ua/geofizicheskiy/article/view/116762 |
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