Полиненасыщенные длинноцепочечные алкеноны в отложениях озер Северо-Минусинской долины (Южная Сибирь), как палео-индикатор климатических изменений

Bulkhin, Alexander; Zykov, Vladimir; Boyandin, Anatoly; Marchenko, Dmitry; Anishchenko, Olesya; M.R.; Rogozin, Denis

doi:10.31951/2658-3518-2024-A-4-286

Authors

Bulkhin A.O. ¹
Zykov V.V. ¹
Boyandin A.N. ¹
Marchenko D.N. ^{1, 2}
Anishchenko O.V. ¹
Kabilov M.R. ³
Rogozin D.Y. ^{1, 2}

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DOI:

https://doi.org/10.31951/2658-3518-2024-A-4-286

Keywords:

long-chain alkenones, salinity indicator, lake sediments, haptophyte algae, South Siberia, paleoclimatology

Abstract

The research of biochemical thermo- and salt-sensitive markers - long-chain alkenones in sediments of lakes of the North Minusinsk valley is an important contribution to the understanding of climatic changes in this region. We found that the total concentration of alkenones in the top layers of bottom sediments of saline lakes increases significantly at a salinity of about 20 g l^-1. Also, it was found that the average chain length of alkenones in the surface sediments rises with increasing salinity and thus can be used as an indicator of salinity, and the ratio of alkenones C₃₇/C₃₈ varies widely, suggesting that this index can be used as a paleo-indicator of salinity. The high correlation between , and indices with salinity indicates their potential for paleosalinity reconstruction. The obtained functional dependences were additionally verified in the core of bottom sediments of Lake Utichie-3 and confirmed the possibility of using alkenones as a paleo-indicator of climatically determined salinity changes in endorheic lakes. The taxonomic composition of haptophyte algae and alkenone composition in the studied lakes were comparable to lakes in prairie regions of North America.