Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 46567 10.2205/2021ES000765 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Rock-magnetic studies of the Tarkhanian sediments in Kop-Takyl section (the Kerch Peninsula) Rock-magnetic studies of the Tarkhanian sediments in Kop-Takyl section (the Kerch Peninsula) Pilipenko O V Pilipenko O V pilipenko@ifz.ru Salnaya N V Salnaya N V Rostovtseva Yu V Rostovtseva Yu V Novruzov Z Novruzov Z Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences ; Geophysical Center of the Russian Academy of Sciences ru Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences ; Geophysical Center of the Russian Academy of Sciences ru Geophysical Center of the Russian Academy of Sciences; Geological Institute of the Russian Academy of Sciences ru Geophysical Center of the Russian Academy of Sciences; Geological Institute of the Russian Academy of Sciences ru Geophysical Center of the Russian Academy of Sciences; Moscow Geological Faculty of the Lomonosov Moscow State University ru Geophysical Center of the Russian Academy of Sciences; Moscow Geological Faculty of the Lomonosov Moscow State University ru Geological and Geophysical Institute of NASA ru Geological and Geophysical Institute of NASA ru 21 2 29 10 2021 https://rjes.ru/en/nauka/article/46567/view

A detailed rock-magnetic study of the Tarkhanian sediments of the Kop-Takyl section, located on the Black Sea coast of the Kerch Peninsula, was carried out in order to verify the reliability of the obtained magnetostratigraphic data of the studied strata. It was previously shown that reverse magnetized rocks are distinguished in the upper part of the Kuvinian beds located at the base of the Tarkhanian regional stage of the Kop-Takyl section. The overlying rocks of the Terskian and Argunian Beds are characterized by normal polarity. This is inconsistent with the available magnetostratigraphic data on the same age Miocene sections. To clarify the reason for this discrepancy, a detailed magneto-mineralogical study of the composition of the ferromagnetic fraction was carried out by conducting thermomagnetic analysis according to the dependence of the saturation magnetic moment on temperature, calculating and constructing a Biplot diagram, and wavelet analysis of the coercive spectra of the saturation isothermal remanent magnetization. It was determined that the main ferromagnetic mineral in the rocks of the upper part of the section, which includes the Argunian Beds, is magnetite. In the lower part of the section, which includes the Kuvinian, Terskian and lower parts of the Argunian Beds, in addition to magnetite, greigite occurs. In the lower part of the Argunian Beds of the section, there is an increase in rock-magnetic parameters, in particular, magnetic susceptibility, due to an increase in the contribution of organic and bacteria activity. The rock-magnetic division of the deposits of the Kop-Takyl section is associated with a change in the deposition conditions that existed in the paleobasin.

A detailed rock-magnetic study of the Tarkhanian sediments of the Kop-Takyl section, located on the Black Sea coast of the Kerch Peninsula, was carried out in order to verify the reliability of the obtained magnetostratigraphic data of the studied strata. It was previously shown that reverse magnetized rocks are distinguished in the upper part of the Kuvinian beds located at the base of the Tarkhanian regional stage of the Kop-Takyl section. The overlying rocks of the Terskian and Argunian Beds are characterized by normal polarity. This is inconsistent with the available magnetostratigraphic data on the same age Miocene sections. To clarify the reason for this discrepancy, a detailed magneto-mineralogical study of the composition of the ferromagnetic fraction was carried out by conducting thermomagnetic analysis according to the dependence of the saturation magnetic moment on temperature, calculating and constructing a Biplot diagram, and wavelet analysis of the coercive spectra of the saturation isothermal remanent magnetization. It was determined that the main ferromagnetic mineral in the rocks of the upper part of the section, which includes the Argunian Beds, is magnetite. In the lower part of the section, which includes the Kuvinian, Terskian and lower parts of the Argunian Beds, in addition to magnetite, greigite occurs. In the lower part of the Argunian Beds of the section, there is an increase in rock-magnetic parameters, in particular, magnetic susceptibility, due to an increase in the contribution of organic and bacteria activity. The rock-magnetic division of the deposits of the Kop-Takyl section is associated with a change in the deposition conditions that existed in the paleobasin.

 arkhanian Eastern Paratethys magnetostratigraphy rock magnetic parameters arkhanian Eastern Paratethys magnetostratigraphy rock magnetic parameters

Burov, B. V., D. K. Nurgaliev, P. G. Yasonov (1986), Paleomagntetic analysis, 167 pp. Publ. Kazan State University, Kazan, Russia. (in Russian) Burov, B. V., D. K. Nurgaliev, P. G. Yasonov (1986), Paleomagntetic analysis, 167 pp. Publ. Kazan State University, Kazan, Russia. (in Russian) Dearing, J. (1999), Environmental magnetic Susceptibility. Using the Bartington M32 System, 104 pp. Chi Publishing, Kenilworth, England Dearing, J. (1999), Environmental magnetic Susceptibility. Using the Bartington M32 System, 104 pp. Chi Publishing, Kenilworth, England Egli, R. (2003), Analysis of the field dependence of remanent magnetization curves, J. Geophys. Res., 108, 2081 Egli, R. (2003), Analysis of the field dependence of remanent magnetization curves, J. Geophys. Res., 108, 2081 Enkin, R. J. (2003), The direction-correction tilt test: an all-purpose tilt/fold test for paleomagnetic studies, Earth Plan. Science Lett., 212, 151-166 Enkin, R. J. (2003), The direction-correction tilt test: an all-purpose tilt/fold test for paleomagnetic studies, Earth Plan. Science Lett., 212, 151-166 Evans, M. E., F. Heller (1999), Environmental Magnetism. Principles and Applications of Envirimagnetics, 299 pp. Elsevier Science, USA Evans, M. E., F. Heller (1999), Environmental Magnetism. Principles and Applications of Envirimagnetics, 299 pp. Elsevier Science, USA Golovina, L. A., I. A. Goncharova (2004), Plankton and benthos (nannoplankton and bivalves) in the Tarkhan deposits of the Kerch Peninsula and the Western Ciscaucasia, Problems of stratigraphy of the Phanerozoic of Ukraine p. 147-150, Institute of Geological Sciences, NAS of Ukraine, Kiev. (in Russian) Golovina, L. A., I. A. Goncharova (2004), Plankton and benthos (nannoplankton and bivalves) in the Tarkhan deposits of the Kerch Peninsula and the Western Ciscaucasia, Problems of stratigraphy of the Phanerozoic of Ukraine p. 147-150, Institute of Geological Sciences, NAS of Ukraine, Kiev. (in Russian) Goncharova, I. A. (1989), Bivalve Mollusks of the Tarkhan and Chokrak basins, PIN AN USSR, 200 pp. Science, Moscow. (in Russian) Goncharova, I. A. (1989), Bivalve Mollusks of the Tarkhan and Chokrak basins, PIN AN USSR, 200 pp. Science, Moscow. (in Russian) Grebenyuk, L. V. (2004), Magnetostratigraphy of the Neogene sediments of the South of the European Russia and the Caucasus. Ph.D. dissertation, p. 181, Publ. Saratov University, Saratov. (in Russian) Grebenyuk, L. V. (2004), Magnetostratigraphy of the Neogene sediments of the South of the European Russia and the Caucasus. Ph.D. dissertation, p. 181, Publ. Saratov University, Saratov. (in Russian) Kosareva, L. R., E. V. Utemov, D. K. Nurgaliev, et al. (2015), Separation of Ferromagnetic Components by Analyzing the Hysteresis Loops of Remanent magnetization, Izvestiya. Physics of the Solid Earth, 51, No. 5, 689-708 Kosareva, L. R., E. V. Utemov, D. K. Nurgaliev, et al. (2015), Separation of Ferromagnetic Components by Analyzing the Hysteresis Loops of Remanent magnetization, Izvestiya. Physics of the Solid Earth, 51, No. 5, 689-708 Mann, S., N. H. C. Sparks, R. B. Frankel, et al. (2015), Biomineralization of ferrimagnetic greigite (Fe 3 S 4 ) and iron pyrite (FeS 2 ) in a magnitotactic bacterium, Nature, 343, No. 5, 258-261 Mann, S., N. H. C. Sparks, R. B. Frankel, et al. (2015), Biomineralization of ferrimagnetic greigite (Fe 3 S 4 ) and iron pyrite (FeS 2 ) in a magnitotactic bacterium, Nature, 343, No. 5, 258-261 Molostovsky, E. A. (1986), The scale of the magnetic polarity of the Mesozoic and Cenozoic and its significance for stratigraphy: based on the materials of the western part of the USSR: dissertation of the doctor of geological min. sciences, p. 401, Publ. Saratov University, Saratov. (in Russian Molostovsky, E. A. (1986), The scale of the magnetic polarity of the Mesozoic and Cenozoic and its significance for stratigraphy: based on the materials of the western part of the USSR: dissertation of the doctor of geological min. sciences, p. 401, Publ. Saratov University, Saratov. (in Russian Neveskaya, L. A., E. I. Kovalenko, E. V. Beluzhenko, et al. (2004), Explanatory Note to the Unified Regional Stratigraphic Scheme of Neogene Deposits of the Southern Regions of the European Part of Russia, 83 pp. Paleontological Institute of the RAS, Moscow. (in Russian) Neveskaya, L. A., E. I. Kovalenko, E. V. Beluzhenko, et al. (2004), Explanatory Note to the Unified Regional Stratigraphic Scheme of Neogene Deposits of the Southern Regions of the European Part of Russia, 83 pp. Paleontological Institute of the RAS, Moscow. (in Russian) Nurgaliev, D K., P. G. Yasonov (2009), Coercive spectrometer. The patent of the Russian Federation for utility model No. 81805, p. 401, Bulletin of FIPS No. 9, Saratov. (in Russian) Nurgaliev, D K., P. G. Yasonov (2009), Coercive spectrometer. The patent of the Russian Federation for utility model No. 81805, p. 401, Bulletin of FIPS No. 9, Saratov. (in Russian) Palcu, D. V., S. V. Popov, L. A. Golovina, et al. (2019), The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea, Gondwana Research, 67, 82-100 Palcu, D. V., S. V. Popov, L. A. Golovina, et al. (2019), The shutdown of an anoxic giant: Magnetostratigraphic dating of the end of the Maikop Sea, Gondwana Research, 67, 82-100 Pevzner, M. A. (1986), Stratigraphy of the Middle Miocene - Pliocene of the South of Europe (according to paleomagnetic data): dissertation of the doctor of geological min. sciences, p. 375, Moscow, Russia. (in Russian) Pevzner, M. A. (1986), Stratigraphy of the Middle Miocene - Pliocene of the South of Europe (according to paleomagnetic data): dissertation of the doctor of geological min. sciences, p. 375, Moscow, Russia. (in Russian) Pilipenko, O. V., E. V. Filina, Yu. V. Rostovtseva, et al. (2020), Petromagnetism and paleomagnetism of the Tarkhanian sediments in Kop-Takyl section, Russ. J. Earth Sci., 20, ES3003 Pilipenko, O. V., E. V. Filina, Yu. V. Rostovtseva, et al. (2020), Petromagnetism and paleomagnetism of the Tarkhanian sediments in Kop-Takyl section, Russ. J. Earth Sci., 20, ES3003 Peters, C., R. Thompson (1998), Magnetic identification of selected natural iron oxides and sulphides, J. of Magnetism and Magnetic Materials, 183, 365- 374 Peters, C., R. Thompson (1998), Magnetic identification of selected natural iron oxides and sulphides, J. of Magnetism and Magnetic Materials, 183, 365- 374 Rostovtseva, Yu. V. (2012), Sedimentogenesis in the basins of the Middle and Late Miocene of 14 of 15 ES2005 pilipenko et al.: rock-magnetic studies of the tarkhanian ES2005 East Paratetis (stratotype Kerch-Taman region), Abstract of the Ph.D. dissertation, p. 48, 11 Format, Moscow Rostovtseva, Yu. V. (2012), Sedimentogenesis in the basins of the Middle and Late Miocene of 14 of 15 ES2005 pilipenko et al.: rock-magnetic studies of the tarkhanian ES2005 East Paratetis (stratotype Kerch-Taman region), Abstract of the Ph.D. dissertation, p. 48, 11 Format, Moscow Tarling, D. H., F. Hrouda (1993), The Magnetic Anisotropy of Rocks, 277 pp. Chapman & Hall, London Tarling, D. H., F. Hrouda (1993), The Magnetic Anisotropy of Rocks, 277 pp. Chapman & Hall, London Taylor, J. (1985), Introduction to Error Theory, 272 pp. World, Moscow. (in Russian) Taylor, J. (1985), Introduction to Error Theory, 272 pp. World, Moscow. (in Russian) Trubikhin, V. M. (1998), Paleomagnetic Scale and Stratigraphy of the Neogene-Quaternary Sediments of Paratetis, Basic Sections of the Neogene of East Paratetis (Taman Peninsula), 13-17 pp. Taman, Volgograd. (in Russian) Trubikhin, V. M. (1998), Paleomagnetic Scale and Stratigraphy of the Neogene-Quaternary Sediments of Paratetis, Basic Sections of the Neogene of East Paratetis (Taman Peninsula), 13-17 pp. Taman, Volgograd. (in Russian) Utemov, E. V., D. V. Nurgaliev (2005), Natural wavelet transformations of gravimetric data: theory and applications, Izvestiya, Physics of the Solid Earth, 4, 88-96. (in Russian) Utemov, E. V., D. V. Nurgaliev (2005), Natural wavelet transformations of gravimetric data: theory and applications, Izvestiya, Physics of the Solid Earth, 4, 88-96. (in Russian)