gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-2s-0624gtcrust-1457Research ArticleСОВРЕМЕННАЯ ГЕОДИНАМИКАRECENT GEODYNAMICSПЕРВЫЕ ДАННЫЕ О ЗАПИСИ ГЕОМАГНИТНОГО ЭКСКУРСА, СОХРАНЕННОЙ В СПЕЛЕОТЕМЕ С ЗАПАДНОГО КАВКАЗАGEOMAGNETIC EXCURSION RECORD PRESERVED IN THE SPELEOTHEM FROM WESTERN CAUCASUS: FIRST DATAhttps://orcid.org/0000-0002-8433-642XГаврюшкинД. А.GavriushkinD. A.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

Dmitriy A. Gavriushkin

10-1 Bolshaya Gruzinskaya St, Moscow 123242

dmitry.gavriushkin@gmail.comhttps://orcid.org/0000-0003-0491-3977ПасенкоА. М.PasenkoA. M.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

https://orcid.org/0000-0001-8364-0529ВеселовскийР. В.VeselovskiyR. V.

123242, Москва, ул. Большая Грузинская, 10, стр. 1119991, Москва, Ленинские горы, 1

10-1 Bolshaya Gruzinskaya St, Moscow 1232421 Leninskie Gory, Moscow 119991

https://orcid.org/0000-0002-1094-8706РудькоД. В.Rud’koD. V.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

Институт физики Земли им. О.Ю. Шмидта РАН; ВОО «Российский союз спелеологов»РоссияSchmidt Institute of Physics of the Earth, Russian Academy of Sciences; RPO "Russian Union of Speleologists"Russian FederationИнститут физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian FederationИнститут физики Земли им. О.Ю. Шмидта РАН; Московский государственный университет им. М.В. ЛомоносоваРоссияSchmidt Institute of Physics of the Earth, Russian Academy of Sciences; Lomonosov Moscow State UniversityRussian Federation202204052022132624624Copyright © Гаврюшкин Д.А., Пасенко А.М., Веселовский Р.В., Рудько Д.В., 20222022Гаврюшкин Д.А., Пасенко А.М., Веселовский Р.В., Рудько Д.В.Gavriushkin D.A., Pasenko A.M., Veselovskiy R.V., Rud’ko D.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1457

Изучение эволюции геомагнитного поля на малых временных масштабах, в частности таких характерных событий, как геомагнитные инверсии и экскурсы, в наши дни приобрело особую актуальность в связи с возросшим вниманием человечества к окружающей среде. В значительной мере дискуссионным остается вопрос о том, как именно резкие изменения характеристик геомагнитного поля отражаются на климате и биосфере; представления о скорости и динамике этих изменений также весьма расплывчаты. «Классические» геологические объекты и существующие методы исследований предоставляют ограниченные возможности для высокодетальных реконструкций вариаций геомагнитного поля, поэтому палеомагнитологи ищут новые объекты и подходы для решения этой задачи. Начатое нами исследование предполагает использование – впервые в России – спелеотемов для изучения вековых вариаций геомагнитного поля.

В настоящем кратком сообщении представлены палеомагнитные записи двух кернов из натечной плотины пещеры Воронцовской, располагающейся на западном крыле Кавказских гор в долине р. Кудепста. Предварительные результаты указывают на наличие записи геомагнитного экскурса в обоих кернах. Дальнейшее изучение образцов из пещеры Воронцовской позволит сопоставить выявленное событие с известными экскурсами, а также уточнить его возраст, продолжительность и динамику.

The study of the geomagnetic field evolution on minor timescales, in particular of such significant events as geomagnetic reversals and excursions, has acquired particular relevance nowadays due to the increased attention of mankind to the environment. The question of how exactly abrupt changes in the characteristics of the geomagnetic field affect the climate and biosphere remains largely debatable; the idea of the speed and dynamics of these changes is also very vague. "Classical" geological objects and existing methods provide limited opportunities for highly detailed reconstructions of geomagnetic field variations; therefore, paleomagnetologists are looking for new objects and approaches to solve this problem. The research that we have begun involves the use – for the first time in Russia – of speleothems to study secular variations of the geomagnetic field.

This brief communication presents paleomagnetic records of two drill-cores from the flowstone from Vorontsovskaya cave, located on the western flank of the Caucasus Mountains in the valley of the river Kudepsta. Preliminary results indicate the presence of a geomagnetic excursion record in both drill-cores. Further study of the samples from Vorontsovskaya cave will make it possible to compare the discovered event with known excursions, as well as to clarify its age, duration, and dynamics.

геомагнитный экскурсвековые вариацииспелеотемычетвертичный периодмагнетизм окружающей средыпалеомагнетизмэволюция геомагнитного поляgeomagnetic excursionsecular variationsspeleothemsQuaternaryenvironmental magnetismpaleomagnetismgeomagnetic field evolutionИсследование выполнено при финансовой поддержке РНФ, грант № 22-27-00453, с использованием оборудования Центра коллективного пользования «Петрофизика, геомеханика и палеомагнетизм» ИФЗ РАН (г. Москва).This study was performed with the support from the Russian Science Foundation, grant 22-27-00453, and with the use of equipment from the Shared Research Facilities "Petrophysics, Geomechanics and Paleomagnetism" of IPE RAS (Moscow).ReferencesБагдасарян Т.Э., Гаврюшкин Д.А., Веселовский Р.В., Усанова О.И. Спелеотемы как источник палеомагнитной записи на примере Воронцовской пещеры, Западный Кавказ // Труды КНЦ РАН (Геология и геохимия). 2019. Вып. 1. С. 32–37. https://doi.org/10.25702/KSC.2307-5252.2019.6.004.Bagdasaryan T.E., Gavrushkin D.A., Veselovskiy R.V., Usanova O.I., 2019. Speleothems as a Source of Paleomagnetic Records by the Example of Vorontsovskaya Cave, Western Caucasus. Proceedings of KSC RAS (Geology and Geophysics) 1, 32–37(in Russian) https://doi.org/10.25702/KSC.2307-5252.2019.6.004.Bogue S.W., Merrill R.T., 1992. The Character of the Field during Geomagnetic Reversals. Annual Review of Earth and Planetary Sciences 20, 181–219.Bogue S.W., Merrill R.T., 1992. The Character of the Field during Geomagnetic Reversals. Annual Review of Earth and Planetary Sciences 20, 181–219.Chou Y.-M., Jiang X., Liu Q., Hu H.-M., Wu Ch.-Ch., Liu J., Jiang Zh., Lee T.-Q. et al., 2018. Multidecadally Resolved Polarity Oscillations during a Geomagnetic Excursion. Proceedings of the National Academy of Sciences 115 (36) 8913–8918. https://doi.org/10.1073/pnas.1720404115.Chou Y.-M., Jiang X., Liu Q., Hu H.-M., Wu Ch.-Ch., Liu J., Jiang Zh., Lee T.-Q. et al., 2018. Multidecadally Resolved Polarity Oscillations during a Geomagnetic Excursion. Proceedings of the National Academy of Sciences 115 (36) 8913–8918. https://doi.org/10.1073/pnas.1720404115.Courtillot V., Olson P., 2007. Mantle Plumes Link Magnetic Superchrons to Phanerozoic Mass Depletion Events. Earth and Planetary Science Letters 260 (3–4), 495–504. https://doi.org/10.1016/j.epsl.2007.06.003.Courtillot V., Olson P., 2007. Mantle Plumes Link Magnetic Superchrons to Phanerozoic Mass Depletion Events. Earth and Planetary Science Letters 260 (3–4), 495–504. https://doi.org/10.1016/j.epsl.2007.06.003.Дублянский В.Н., Илюхин В.В. Крупнейшие карстовые пещеры и шахты СССР. М.: Изд-во Наука, 1982. 137 с.Dublyansky V.N., Ilyukhin V.N., 1982. The Largest Karst Caves and Mines of the USSR. Nauka, Moscow, 137 p. (in Russian)Enkin R.J., 1994. A Computer Program Package for Analysis and Presentation of Paleomagnetic Data. Geological Survey of Canada, Sidney, 16 p.Enkin R.J., 1994. A Computer Program Package for Analysis and Presentation of Paleomagnetic Data. Geological Survey of Canada, Sidney, 16 p.Font E., Veiga-Pires C., Pozo M., Carvallo C., de Siqueira Neto A.C., Camps P., Fabre S., Mirão J., 2014. Magnetic Fingerprint of Southern Portuguese Speleothems and Implications for Paleomagnetism and Environmental Magnetism. Journal of Geophysical Research: Solid Earth 119 (11), 7993–8020. https://doi.org/10.1002/2014JB011381.Font E., Veiga-Pires C., Pozo M., Carvallo C., de Siqueira Neto A.C., Camps P., Fabre S., Mirão J., 2014. Magnetic Fingerprint of Southern Portuguese Speleothems and Implications for Paleomagnetism and Environmental Magnetism. Journal of Geophysical Research: Solid Earth 119 (11), 7993–8020. https://doi.org/10.1002/2014JB011381.Gallet Y., Genevey A., Le Goff M., Frédéric F., Eshraghi S., 2006. Possible Impact of the Earth Magnetic Field on the History of Ancient Civilizations. Earth and Planetary Science Letters 246 (1–2), 17–26. https://doi.org/10.1016/j.epsl.2006.04.001.Gallet Y., Genevey A., Le Goff M., Frédéric F., Eshraghi S., 2006. Possible Impact of the Earth Magnetic Field on the History of Ancient Civilizations. Earth and Planetary Science Letters 246 (1–2), 17–26. https://doi.org/10.1016/j.epsl.2006.04.001.Korte M., Constable C., Donadini F., Holme R., 2011. Reconstructing the Holocene Geomagnetic Field. Earth and Planetary Science Letters 312, 3–4, 497–505. https://doi.org/10.1016/j.epsl.2011.10.031.Korte M., Constable C., Donadini F., Holme R., 2011. Reconstructing the Holocene Geomagnetic Field. Earth and Planetary Science Letters 312, 3–4, 497–505. https://doi.org/10.1016/j.epsl.2011.10.031.Laj C., Channell J.E.T., 2007. Geomagnetic Excursions. In: B. Romanowicz, A. Dziewonski (Eds), Treatise on Geophysics. Vol. 5: Geomagnetism. Elsevier, p. 373–416. https://doi.org/10.1016/B978-044452748-6.00095-X.Laj C., Channell J.E.T., 2007. Geomagnetic Excursions. In: B. Romanowicz, A. Dziewonski (Eds), Treatise on Geophysics. Vol. 5: Geomagnetism. Elsevier, p. 373–416. https://doi.org/10.1016/B978-044452748-6.00095-X.Lascu I., Feinberg J.M., 2011. Speleothem Magnetism. Quaternary Science Reviews 30 (23–24), 3306–3320. https://doi.org/10.1016/j.quascirev.2011.08.004.Lascu I., Feinberg J.M., 2011. Speleothem Magnetism. Quaternary Science Reviews 30 (23–24), 3306–3320. https://doi.org/10.1016/j.quascirev.2011.08.004.Lascu I., Feinberg J.M., Dorale J.A., Cheng H., Edwards R.L., 2016. Age of the Laschamp Excursion Determined by U-Th Dating of a Speleothem Geomagnetic Record from North America. Geology 44 (2), 139–142. https://doi.org/10.1130/G37490.1.Lascu I., Feinberg J.M., Dorale J.A., Cheng H., Edwards R.L., 2016. Age of the Laschamp Excursion Determined by U-Th Dating of a Speleothem Geomagnetic Record from North America. Geology 44 (2), 139–142. https://doi.org/10.1130/G37490.1.Morinaga H., Horie I., Yaskawa K., 1992. A Geomagnetic Reversal Recorded in a Stalagmite Collected in Western Japan. Journal of Geomagnetism and Geoelectricity 44 (8), 661–675. https://doi.org/10.5636/jgg.44.661.Morinaga H., Horie I., Yaskawa K., 1992. A Geomagnetic Reversal Recorded in a Stalagmite Collected in Western Japan. Journal of Geomagnetism and Geoelectricity 44 (8), 661–675. https://doi.org/10.5636/jgg.44.661.Nilsson A., Holme R., Korte M., Suttie N., Hill M., 2014. Reconstructing Holocene Geomagnetic Field Variation: New Methods, Models and Implications. Geophysical Journal International 198 (1), 229–248. https://doi.org/10.1093/gji/ggu120.Nilsson A., Holme R., Korte M., Suttie N., Hill M., 2014. Reconstructing Holocene Geomagnetic Field Variation: New Methods, Models and Implications. Geophysical Journal International 198 (1), 229–248. https://doi.org/10.1093/gji/ggu120.Osete M.-L., Martin-Chivelet J., Rossi C., Edwards R.L., Egli R., Munoz-Garcia B., Wang X., Pavón-Carrasco F.J., Heller F., 2012. The Blake Geomagnetic Excursion Recorded in a Radiometrically Dated Speleothem. Earth and Planetary Science Letters 353–354, 173–181. https://doi.org/10.1016/j.epsl.2012.07.041.Osete M.-L., Martin-Chivelet J., Rossi C., Edwards R.L., Egli R., Munoz-Garcia B., Wang X., Pavón-Carrasco F.J., Heller F., 2012. The Blake Geomagnetic Excursion Recorded in a Radiometrically Dated Speleothem. Earth and Planetary Science Letters 353–354, 173–181. https://doi.org/10.1016/j.epsl.2012.07.041.Pavón-Carrasco F.J., Osete M.L., Torta J.M., De Santis A., 2014. A Geomagnetic Field Model for the Holocene Based on Archaeomagnetic and Lava Flow Data. Earth and Planetary Science Letters 388, 98–109. https://doi.org/10.1016/j.epsl.2013.11.046.Pavón-Carrasco F.J., Osete M.L., Torta J.M., De Santis A., 2014. A Geomagnetic Field Model for the Holocene Based on Archaeomagnetic and Lava Flow Data. Earth and Planetary Science Letters 388, 98–109. https://doi.org/10.1016/j.epsl.2013.11.046.Perkins A.M., 1996. Observations under Electron Microscopy of Magnetic Minerals Extracted from Speleothems. Earth and Planetary Science Letters 139 (1–2), 281–289. https://doi.org/10.1016/0012-821X(96)00013-1.Perkins A.M., 1996. Observations under Electron Microscopy of Magnetic Minerals Extracted from Speleothems. Earth and Planetary Science Letters 139 (1–2), 281–289. https://doi.org/10.1016/0012-821X(96)00013-1.Perkins A.M., Maher B.A., 1993. Rock Magnetic and Palaeomagnetic Studies of British Speleothems. Journal of Geomagnetism and Geoelectricity 45 (2), 143–153. https://doi.org/10.5636/jgg.45.143.Perkins A.M., Maher B.A., 1993. Rock Magnetic and Palaeomagnetic Studies of British Speleothems. Journal of Geomagnetism and Geoelectricity 45 (2), 143–153. https://doi.org/10.5636/jgg.45.143.Поспелова Г.А. Геомагнитные экскурсы хрона Брюнес и глобальные климатические осцилляции // Физика Земли. 2000. № 8. С. 3–14.Pospelova G.A., 2000. Geomagnetic Excursions of the Brunhes Chron and Global Climate Oscillations. Izvestiya, Physics of the Solid Earth 36 (8), 619–629 (in Russian)Pozzi J.-P., Rousseau L., Falguères C., Mahieux G., Deschamps P., Shao Q., Kachi D., Bahain J.-J., Tozzi C., 2019. U-Th Dated Speleothem Recorded Geomagnetic Excursions in the Lower Brunhes. Scientific Reports 9, 1114. https://doi.org/10.1038/s41598-018-38350-4.Pozzi J.-P., Rousseau L., Falguères C., Mahieux G., Deschamps P., Shao Q., Kachi D., Bahain J.-J., Tozzi C., 2019. U-Th Dated Speleothem Recorded Geomagnetic Excursions in the Lower Brunhes. Scientific Reports 9, 1114. https://doi.org/10.1038/s41598-018-38350-4.Thébault E., Finlay C.C., Beggan C.D., Alken P., Aubert J., Barrois O., Bertrand F., Bondar T. et al., 2015. International Geomagnetic Reference Field: The 12th Generation. Earth, Planets and Space 67, 79. https://doi.org/10.1186/s40623-015-0228-9.Thébault E., Finlay C.C., Beggan C.D., Alken P., Aubert J., Barrois O., Bertrand F., Bondar T. et al., 2015. International Geomagnetic Reference Field: The 12th Generation. Earth, Planets and Space 67, 79. https://doi.org/10.1186/s40623-015-0228-9.

The authors declare that there are no conflicts of interest present.