Rock magnetic methods in the study of the loess-soil series of Eastern Siberia

A. Yu. Kazansky; G. G. Matasova; A. A. Shchetnikov; I. A. Filinov

doi:10.31857/S2949178924020036

Rock magnetic methods in the study of the loess-soil series of Eastern Siberia

A. Yu. Kazansky, G. G. Matasova, A. A. Shchetnikov, I. A. Filinov

https://doi.org/10.31857/S2949178924020036

EDN: POGZIG

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Abstract

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.

Keywords

subaerial deposits, magnetic properties, frequency-dependent magnetic susceptibility, magnetic grain size, paleoclimatic interpretation, Baikal region

About the Authors

A. Yu. Kazansky

Lomonosov Moscow State University, Faculty of Geology; Geological Institute RAS, Moscow
Russian Federation

G. G. Matasova

Geological Institute RAS, Moscow; Institute of the Earth’s Crust SB RAS, Irkutsk
Russian Federation

A. A. Shchetnikov

Geological Institute RAS, Moscow; Institute of the Earth’s Crust SB RAS, Irkutsk; Vinogradov Institute of Geochemistry SB RAS, Irkutsk
Russian Federation

I. A. Filinov

Geological Institute RAS, Moscow; Institute of the Earth’s Crust SB RAS, Irkutsk; Vinogradov Institute of Geochemistry SB RAS, Irkutsk
Russian Federation

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For citations:

Kazansky A.Yu., Matasova G.G., Shchetnikov A.A., Filinov I.A. Rock magnetic methods in the study of the loess-soil series of Eastern Siberia. Geomorfologiya i Paleogeografiya. 2024;55(2):63-85. (In Russ.) https://doi.org/10.31857/S2949178924020036. EDN: POGZIG