TY - JOUR

T1 - The Holocene environmental changes revealed from the sediments of the Yarkov sub-basin of Lake Chany, south-western Siberia

AU - Krivonogov, S. K.

AU - Zhdanova, A. N.

AU - Solotchin, P. A.

AU - Kazansky, A. Y.

AU - Chegis, V. V.

AU - Liu, Z.

AU - Song, M.

AU - Zhilich, S. V.

AU - Rudaya, N. A.

AU - Cao, X.

AU - Palagushkina, O. V.

AU - Nazarova, L. B.

AU - Syrykh, L. S.

N1 - As the data presented in this paper have been collected and treated during more than 15 years, we acknowledge all funds and organizations supported the authors in this period. The paper is written within the State assignment of the Institute of geology and mineralogy SB RAS. The biomarker analysis and all organic matter related interpretations were made in favor of the joint Russia-China research project, RFBR no. 21-55-53037 and NSFC no. 42111530031. The lake level changes were investigated in favor of the RFBR project No. 19-29-05085. Numerical reconstruction of climate was made in the frame of ANSO Collaborative Research (ANSO-CR-PP-2021-02). The contribution by Natalia Rudaya matches interests of the RSF project no. 20-17-00110 and the Tomsk State University Development Program (Priority-2030). Xianyong Cao was financed by National Natural Science Foundation of China (grant no. 41988101) and the Sino-German Mobility Program (grant no. M-0359). Diatom and chironomid analyses were funded by the RSF project No. 20-17-00135. Databases developed with the support of the RSF No. 22-17-00185 and 22-17-00113 projects were used for quantitative environmental reconstructions (WD and T July) and supplementary statistical research. We acknowledge Dr. Kim Ju Yong, Korean Institute of Geosciences and Mineral Resources (KIGAM), for his kind help with radiocarbon dating. We are grateful to the reviewers Prof. Frank Riedel, Free University of Berlin, and Prof. Mary Edwards, University of Southampton, for their significant comments and improvements.

PY - 2023/3

Y1 - 2023/3

N2 - Lake Chany is the largest endorheic lake in Siberia whose catchment is entirely on the territory of Russia. Its geographical location on the climate-sensitive boundary of wet and dry landscapes provides an opportunity to gain more knowledge about environmental changes in the West Siberian interior during the Holocene and about the evolution of the lake itself. Sediment cores obtained from the Yarkov sub-basin of the lake in 2008 have been comprehensively studied by a number of approaches including sedimentology and AMS dating, pollen, diatom and chironomid analyses (with statistical interpretation of the results), mineralogy of authigenic minerals and geochemistry of plant lipids (biomarker analysis.). Synthesis of new results presented here and published data provides a good justification for our hypothesis that Lake Chany is very young, no older than 3.6 ka BP. Before that, between 9 and 3.6 ka BP, the Chany basin was a swampy landscape with a very low sedimentation rate; it could not be identified as a water body. In the early lake phase, between 3.6 and 1.5 ka BP, the lake was shallow, 1.2–3.5 m in depth, and it rose to its modern size, up to 6.5 m in depth, during the last millennium. Our data reveal important changes in the understanding of the history of this large endorheic lake, as before it was envisioned as a large lake with significant changes in water level since ca. 14 ka BP. In addition to hydrology, our proxies provide updates and details of the regional vegetation and climate change since ca. 4 ka BP in the West-Siberian forest-steppe and steppe. As evolution of the Chany basin is dependent on hydroclimatic changes in a large region of southern West Siberia, we compare lake-level change and climate-change proxies from the other recently and most comprehensively studied lakes of the region.

AB - Lake Chany is the largest endorheic lake in Siberia whose catchment is entirely on the territory of Russia. Its geographical location on the climate-sensitive boundary of wet and dry landscapes provides an opportunity to gain more knowledge about environmental changes in the West Siberian interior during the Holocene and about the evolution of the lake itself. Sediment cores obtained from the Yarkov sub-basin of the lake in 2008 have been comprehensively studied by a number of approaches including sedimentology and AMS dating, pollen, diatom and chironomid analyses (with statistical interpretation of the results), mineralogy of authigenic minerals and geochemistry of plant lipids (biomarker analysis.). Synthesis of new results presented here and published data provides a good justification for our hypothesis that Lake Chany is very young, no older than 3.6 ka BP. Before that, between 9 and 3.6 ka BP, the Chany basin was a swampy landscape with a very low sedimentation rate; it could not be identified as a water body. In the early lake phase, between 3.6 and 1.5 ka BP, the lake was shallow, 1.2–3.5 m in depth, and it rose to its modern size, up to 6.5 m in depth, during the last millennium. Our data reveal important changes in the understanding of the history of this large endorheic lake, as before it was envisioned as a large lake with significant changes in water level since ca. 14 ka BP. In addition to hydrology, our proxies provide updates and details of the regional vegetation and climate change since ca. 4 ka BP in the West-Siberian forest-steppe and steppe. As evolution of the Chany basin is dependent on hydroclimatic changes in a large region of southern West Siberia, we compare lake-level change and climate-change proxies from the other recently and most comprehensively studied lakes of the region.

KW - Climate

KW - Environment

KW - Holocene

KW - Multiproxy study

KW - Saline lake

KW - West Siberia

UR - https://www.scopus.com/inward/record.url?eid=2-s2.0-85145689769&partnerID=40&md5=681859d2a25d9f1812bf6ca4aafd5c0c

UR - https://www.mendeley.com/catalogue/9c131111-042f-3c41-bdb5-7911d9105202/

U2 - 10.1016/j.gsf.2022.101518

DO - 10.1016/j.gsf.2022.101518

M3 - Article

VL - 14

JO - Geoscience Frontiers

JF - Geoscience Frontiers

SN - 1674-9871

IS - 2

M1 - 101518

ER -