Доклады Академии наукДоклады Академии наук0869-5652The Russian Academy of Sciences1318210.31857/S0869-5652486153-56Research ArticleSources of paleomagnetic signal in iron-bearing marine sedimentary depositsRudminM. A.rudminma@tpu.ruMazurovA. K.rudminma@tpu.ruSergienkoV. I.<p>Academician of the RAS</p>rudminma@tpu.ruSavichevO. G.rudminma@tpu.ruSemiletovI. P.<p>Correspondent member of RAS</p>rudminma@tpu.ruNational Research Tomsk Polytechnic UniversityPacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences26052019486153560606201906062019Copyright © 2019, Russian academy of sciences2019<p>This paper presents the results of interpreting the change in the magnetic signal of ferruginous marine sedimentary rocks using the example of the Cretaceous-Paleogene Bakchar deposit (Western Siberia). Anomalous magnetic susceptibility (MS) values are determined by two factors: (a) a diagenetic process accompanied by the formation of pyrrhotite, greigite and siderite in ironstones, (b) an increase detrital input with deposition of magnetite and ilmenite in the siltstones on the background of climate moistening and intense weathering. It is shown that increased MS values in iron-bearing marine sedimentary deposits can be associated with the formation of ferrimagnetic sulfides, which indicates to the methane emission through ancient marine bottom sediments.</p>marine sedimentsironstonesmagnetic mineralsmagnetic susceptibilityBakchar depositWestern Siberiaморские отложенияжелезнякимагнитные минералымагнитная восприимчивостьБакчарское месторождениеЗападная Сибирь[Roberts A.P. // Earth-Sci. Rev. 2015. V. 151. P. 1-47.][Liu Q., Roberts A..P., Larrasoaña J.C., Banerjee S.K., Guyodo Y., Tauxe L., Oldfield F. // Rev. Geophys. 2012. V. 50. № 4. P. 1-50.][Западно-Сибирский железорудный бассейн / Под ред. Ф.Н. Шахова. Новосибирск: СО РАН СССР, 1964. 448 с.][Рудмин М.А., Мазуров А.К. // ДАН. 2016. Т. 471. № 2. С. 1238-1241.][Rudmin M., Roberts A..P., Horng C.-S., Mazurov A., Savinova O., Ruban A., Kashapov R., Veklich M. // Geochem., Geoph., Geosys. 2018. V. 19. P. 1-22.][Larrasoaña J.C., Roberts A..P., Musgrave R.J., Gràcia E., Piñero E., Vega M., Martínez-Ruiz F. // Earth and Planet. Sci. Lett. 2007. V. 261. № 3. P. 350-366.][Lemaitre N., Bayon G., Ondréas H., Caprais J.-C., Freslon N., Bollinger C., Rouget M.-L., de Prunelé A., Ruffine L., Olu-Le Roy K., Sarthou G. // Earth and Planet. Sci. Lett. 2014. V. 404. P. 376-388.][Сергиенко В.И., Лобковский Л.И., Семилетов И.П. и др. // ДАН. 2012. Т. 446. № 3. С. 330-335.][Shakhova N., Semiletov I., Sergienko V., et al. // Phil. trans. Ser. A. 2015. V. 373. № 2052. P. 1-13.][Shakhova N., Semiletov I., Gustafsson O., et al. // Nature Commun. 2017. V. 8. P. 1-13.]