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<b>Abstract</b>— <p>The group of Talaya lakes in the eastern Maimandzhinsky Mountains, Kolyma Highlands, NE Russia, comprises Gryazevoe, Shchuch’e, Goluboe, and Nalimnoe lakes of glacial origin, which were formed in the Late Neopleistocene to Early Holocene. Geochemical characteristics were obtained from the lake sediments, tephra, deluvial deposits, and bedrocks. Based on the analysis of the distribution of major elements, the SiO<sub>2</sub>/TiO<sub>2</sub>, Fe<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>, Fe<sub>2</sub>O<sub>3</sub>/MnO, SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>/MgO, and SiO<sub>2</sub>/Fe<sub>2</sub>O<sub>3</sub> ratios, the ICV and CIA indices, and on the analysis of principal-component data, geochemical zones reflecting various sedimentation conditions have been distinguished in the sediments: intervals of biogenic, terrigenous, and chemogenic (authigenic) accumulation. The authigenic iron-containing minerals are sulfides (pyrite and pyrrhotite), and the clastic minerals are titanomagnetite, magnetite, and ilmenite. Data obtained on the dependences of the ratios of elements and indices on the graine size of granulometric fractions of the deluvium highlight relationships between geochemical characteristics of the lake sediments and deluvial deposits and make it possible to reconstruct the principal evolutionary stages of the lakes. The paper presents comprehensive characteristics of the sediments accumulated during the transition from the Late Neopleistocene to Holocene.</p>

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Distinctive Features of Sedimentation in the Talaya Group of Glacial Lakes, Kolyma Highlands, during the Late Neopleistocene–Holocene: Geochemical Evidence

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • D. K. Pozhidaeva,
  • P. S. Minyuk

摘要

Abstract—

The group of Talaya lakes in the eastern Maimandzhinsky Mountains, Kolyma Highlands, NE Russia, comprises Gryazevoe, Shchuch’e, Goluboe, and Nalimnoe lakes of glacial origin, which were formed in the Late Neopleistocene to Early Holocene. Geochemical characteristics were obtained from the lake sediments, tephra, deluvial deposits, and bedrocks. Based on the analysis of the distribution of major elements, the SiO2/TiO2, Fe2O3/TiO2, Fe2O3/MnO, SiO2/Al2O3, SiO2/MgO, and SiO2/Fe2O3 ratios, the ICV and CIA indices, and on the analysis of principal-component data, geochemical zones reflecting various sedimentation conditions have been distinguished in the sediments: intervals of biogenic, terrigenous, and chemogenic (authigenic) accumulation. The authigenic iron-containing minerals are sulfides (pyrite and pyrrhotite), and the clastic minerals are titanomagnetite, magnetite, and ilmenite. Data obtained on the dependences of the ratios of elements and indices on the graine size of granulometric fractions of the deluvium highlight relationships between geochemical characteristics of the lake sediments and deluvial deposits and make it possible to reconstruct the principal evolutionary stages of the lakes. The paper presents comprehensive characteristics of the sediments accumulated during the transition from the Late Neopleistocene to Holocene.