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https://doi.org/10.26516/2541-9641.2025.1.23

Geochemical Signatures of Loesses from the Tunka Valley and Oka Basin, South of Eastern Siberia: Comparison with Geochemical Signatures of Loesses from Adjacent Asia


S.V. Rasskazov1,2, T.A. Yasnygina1, I.S. Chuvashova1, A.P. Papaev3, S.V. Snopkov2,4, D.I. Parfenov2, K.O. Ivanov2, I.V. Polezhaeva2, M.E. Kalinovich2

1Institute of the Earth's Crust SB RAS, Irkutsk, Russia

2Irkutsk State University, Irkutsk, Russia

3Orlik Secondary School, Orlik, Russia

4Irkutsk National Research Technical University, Irkutsk, Russia

Abstract. We present results of comparative geochemical studies of loesses in the Oka Basin and in the Tunka Valley. We infer that those, underlying and covering the Ust-Zhom-Bolok lava cover in the Oka Basin, are critical for dating its eruption in the late Pleistocene. We determine a wider range of loess compositions for the Oka Basin than for the Tunka Valley and emphasize a general compositional difference of these loesses, representative for the south of Eastern Siberia, compared to those from China and Yakutia.

Keywords: loess, alluvium, basalts, Holocene, late Pleistocene, Eastern Sayans, Tunka Valley, China, Yakutia

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Rasskazov Sergei Vasilevich,

doctor of geological and mineralogical sciences, professor,

664025, Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

Head of Dynamic Geology Char,

664033, Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Head of the Laboratory for Isotopic and Geochronological Studies,

tel.: (3952) 51–16–59,

email: rassk@crust.irk.ru

Yasnygina Tatyana Alexandrovna,

candidate of geological and mineralogical sciences,

664033 Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Senior Researcher,

tel.: (3952) 51–16–59,

email: ty@crust.irk.ru

Chuvashova Irina Sergeevna,

candidate of geological and mineralogical sciences,

664033 Irkutsk, st. Lermontova, 128,

Institute of the Earth's Crust SB RAS,

Senior Researcher,

tel.: (3952) 51–16–59,

email: chuvashova@crust.irk.ru

Papaev Alexey Purboevich,

Candidate of Geography,

Orlik settlement, Okinsky district, Buryat Republic,

Orlik Secondary School,

Deputy Director for Educational Work,

еmail: papaev13@rambler.ru

 

Snopkov Sergey Viktorovich,

Candidate of Geological and Mineralogical Sciences,

assistant professor,

664025, Irkutsk, Lenin st., 3,

Irkutsk State University, Faculty of Geology,

664074, Irkutsk, Kurchatov st., 3,

Siberian School of Geosciences, Irkutsk National Research Technical University,

Leading Researcher,

email: snopkov_serg@mail.ru

 

Parfenov Daniil Igorevich,

664025, Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

second year bachelor's student,

email: parff0315@mail.ru

 

Ivanov Kirill Olegovich,

664025, Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

second year student of master's degree program, correspondence department,

email: kirionid@yandex.ru

 

Polezhaeva Irina Viktorovna,

664003 Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

second year student of master's degree program, correspondence department,

email: polezhaeva80@mail.ru

 

Kalinovich Milena Eugeneievna,

664003 Irkutsk, st. Lenina, 3,

Irkutsk State University, Faculty of Geology,

second year student of master's degree program, correspondence department,

email: 05080058@list.ru

 

 



Article received: 10.03.2025; corrected: 20.03.2025; accepted: 21.03.2025.


FOR CITATION: Rasskazov S.V., Yasnygina T.A., Chuvashova I.S., Papaev A.P., Snopkov S.V., Parfenov D.I., Ivanov K.O., Polezhaeva I.V., Kalinovich M.E. Geochemical Signatures of Loesses from the Tunka Valley and Oka Basin, South of Eastern Siberia: Comparison with Geochemical Signatures of Loesses from Adjacent Asia // Geology and Environment. 2025. Vol. 5, No. 1. P. 23-60. DOI 10.26516/2541-9641.2025.1.23. EDN: CSHFGK


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