geomorfГеоморфология и палеогеографияGeomorfologiya i Paleogeografiya2949-17892949-179710.31857/S2949178924020036POGZIGgeomorf-3303Research ArticleЛёссово-почвенные серии Северной ЕвразииLoess-soil series of Northern EurasiaПетромагнитные методы в изучении лёссово-почвенных серий Восточной СибириRock magnetic methods in the study of the loess-soil series of Eastern Siberiahttps://orcid.org/0000-0002-8840-0978КазанскийА. Ю.KazanskyA. Yu.kazansky_alex@mail.ruhttps://orcid.org/0000-0002-7732-5394МатасоваГ. Г.MatasovaG. G.galinamatasova@mail.ruhttps://orcid.org/0000-0002-4591-6421ЩетниковА. А.ShchetnikovA. A.shch@crust.irk.ruhttps://orcid.org/0000-0002-7390-8373ФилиновИ. А.FilinovI. A.filinov@crust.irk.ruМосковский государственный университет имени М. В. Ломоносова, геологический факультет; Геологический институт РАН, МоскваРоссияLomonosov Moscow State University, Faculty of Geology; Geological Institute RAS, MoscowRussian FederationГеологический институт РАН, Москва; Институт земной коры СО РАН, ИркутскРоссияGeological Institute RAS, Moscow; Institute of the Earth’s Crust SB RAS, IrkutskRussian FederationГеологический институт РАН, Москва; Институт земной коры СО РАН, Иркутск; Институт геохимии имени А. П. Виноградова, СО РАН, ИркутскРоссияGeological Institute RAS, Moscow; Institute of the Earth’s Crust SB RAS, Irkutsk; Vinogradov Institute of Geochemistry SB RAS, IrkutskRussian Federation2024251220245526385Copyright © Казанский А.Ю., Матасова Г.Г., Щетников А.А., Филинов И.А., 20242024Казанский А.Ю., Матасова Г.Г., Щетников А.А., Филинов И.А.Kazansky A.Y., Matasova G.G., Shchetnikov A.A., Filinov I.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://geomorphology.igras.ru/jour/article/view/3303

Петромагнитные методы дополняют визуальные геологические и гранулометрические исследования субаэральных комплексов, позволяя решать актуальные и интересные с точки зрения палеогеографии задачи. Магнитные характеристики, выражаемые числом, дают обоснованную базу для корректного сравнения субаэральных отложений между собой, для более детального расчленения осадков и уточнения их генезиса, для выявления маркирующих горизонтов, для корреляционного анализа данных различных методов. В работе обсуждаются основные механизмы формирования магнитных свойств лёссово-почвенных серий в различных регионах (“китайский” и “аляскинский”) и особенности в интерпретации петромагнитных параметров в рамках различных механизмов. Анализируется палео-климатическая информативность петромагнитных параметров в различных физико-географических обстановках. Показаны различия в формировании магнитных свойств лёссово-почвенных серий Сибири (“сибирский” механизм) и представлены принципы палеоклиматической интерпретации петромагнитных данных на основе исследования более 40 разрезов субаэральных комплексов юга Западной, Средней и Восточной Сибири. На примере разрезов субаэральных отложений Восточной Сибири на основе изменения петромагнитных параметров выявлен тренд климатических изменений в течение квартера, отражающийся в смене “педогенного” механизма на “сибирский” и далее на “аляскинский”. Наличие такого тренда может служить критерием для диагностики субаэральных отложений эоплейстоценового возраста.

Rock magnetic methods complement geological and granulometric studies of subaerial deposits, allowing to solve relevant and interesting problems in terms of paleogeography. The magnetic characteristics are numerical and provide a reasonable basis for a correct comparison of subaerial deposits among themselves, for a more detailed stratigraphic dissection of sediments and specifying their genesis, for the identification of marker horizons, and for the correlation of the data of different methods. The paper discusses the main mechanisms of formation of the magnetic properties of loess-soil series in different regions (“Chinese” and “Alaskan”) and peculiarities in the interpretation of rock magnetic parameters within the framework of different mechanisms. The paleoclimatic informativity of rock magnetic parameters in different physical-geographic settings is analyzed. The fundamental differences in the formation of the magnetic properties of the loess-soil series of Siberia (“Siberian” mechanism) are shown and the principles of paleoclimatic interpretation of rock magnetic data on the basis of more than 40 sections of subaerial complexes of southern Western, Preenisei and Eastern Siberia are developed. Based on changes in rock magnetic parameters, the trend of climatic changes during the quaternary period, which consists in the change from the “pedogenic” mechanism to the “Siberian” one and then to the “Alaskan” one, was revealed using the example of subaerial sediments of Eastern Siberia. This difference in mechanisms may serve as a criterion for diagnosing subaerial deposits of Eopleistocene age.

субаэральные отложениямагнитные свойствачастотно-зависимая магнитная восприимчивостьразмер магнитного зернапалеоклиматическая интерпретацияБайкальский регионsubaerial depositsmagnetic propertiesfrequency-dependent magnetic susceptibilitymagnetic grain sizepaleoclimatic interpretationBaikal regionИсследование выполнено за счет гранта Российского научного фонда № 23-27-00022This study was supported by the Russian Science Foundation Grant № 23-27-00022ReferencesАлексеева Н. В. (2005). Эволюция природной среды Западного Забайкалья в позднем кайнозое (по данным фауны мелких млекопитающих). М: ГЕОС. 141 с.Akram H., Yoshida M. (1997) Ultra-fine magnetite/maghemite and their magnetic granulometry in the Late Pleistocene loess-paleosol deposits, Haro River Area, Attock Basin, Pakistan. Proceedeings of Inter-PARMAGS Seminar (1996). Paleomagnetism of Collision Belts, Recent Progress in Geomagnetism, Rock Magnetism and Paleomagnetism. No. 1. Р. 153-197.Базаров Д. Б. (1986). 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The authors declare that there are no conflicts of interest present.