bluuebunny/crossref_metadata_2025 huggingface dataset:
Geomorphological evidence of Lake Ladoga Holocene regressions after the Baltic Ice lake drainage (derived from sediment echosounder data)
Authors: Aksenov A.O. ,   Saint-Petersburg State University, 7/9 Universitetskaya emb., Saint-Petersburg, 199034, Russia,   Arctic and Antarctic Research Institute, 38 Bering str., Saint-Petersburg, 199397, Russia, Krastel  ,   Kiel University, 4 Christian-Albrechts-Platz, Kiel, 24118, Germany, Rybalko A.E. ,   Saint-Petersburg State University, 7/9 Universitetskaya emb., Saint-Petersburg, 199034, Russia,   FSBI VNII Okeangeologia, 1 Angliyskiy ave., Saint-Petersburg, 190121, Russia, Fedorov G.B. ,   Saint-Petersburg State University, 7/9 Universitetskaya emb., Saint-Petersburg, 199034, Russia,   Arctic and Antarctic Research Institute, 38 Bering str., Saint-Petersburg, 199397, Russia
Published: September 2022

Abstract. Lake Ladoga has been experiencing frequent water-level fluctuations during the Holocene. Plenty surveys about reconstructions of lake level were published during the last century. They focused on the onshore transgressive sediments and landforms, while a regression below present level was only an assumption. Here for the first time, we present indications of lake-level lowstands by means of sediment echosounder data collected within the PLOT-project . Three types of landforms of coastal and terrestrial origin are detected in the basin. These are coastal bars, erosional terraces and buried erosional valleys. Three paleo-shorelines were determined at depths of 13, 21 and 40-42 m. The first two shorelines are identified by the presence of the coastal bars, while the level of maximum regression is obtained from erosional marks. Reported landforms are assumed to be formed in the Early Holocene following the Baltic Ice Lake drainage.
Quaternary and geomorphological features of Lake Onego. Comparison with Lake Ladoga
Authors: Beliaev P.Yu. ,   State Company VNII Oceanologya, Angliyskiy Avenue, 1, St.Petersburg, 190121, Russia,   Northern Water Problems Institute of the Federal Research Centre Karelian Research Center of the Russian Academy of Sciences, Aleksandra Nevskogo Avenue, 50, Petrozavodsk, 185003, Russia, Rybalko A.E. ,   State Company VNII Oceanologya, Angliyskiy Avenue, 1, St.Petersburg, 190121, Russia,   Northern Water Problems Institute of the Federal Research Centre Karelian Research Center of the Russian Academy of Sciences, Aleksandra Nevskogo Avenue, 50, Petrozavodsk, 185003, Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, Moika Emb. 48, Saint-Petersburg, 191186, Russia
Published: September 2022

Abstract. Lake Onego is a very important source of fresh water and traffic artery of Russian NW. In addition, it is a very significant source of paleogeographical and Quaternary geological information. Studies of geology, geomorphology, paleolimnology and ecology of Onego and Ladoga lakes are being conducted since 19th century by different institutes and research companies. At the modern stage of limnological research the most significant research centers are: Saint-Petersburg state university, Moscow state university, Limnological institute RAS, Northern Water problem institute RAS, PMGRE, VSEGEI, VNII Ocengeologia, and a lot of organizations with geology, ecology, limnology and hydrology specializations with Russian and foreign researchers. This article was written based on the results of field works conducted in 2014 - 2020. The article aimed to update the stratigraphy of Quaternary deposits of the Lake Onego bottom; describe bottom sediments and relief of Lake Onego; highlight stages of the Lake Onego bottom development according to geological and geomorphological features; compare Onego and Ladoga lakes bottom sediments and relief.
Sedimentary processes in Lake Onego at the present time
Authors: Belkina N.A. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Strakhovenko V.D. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia,   V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug ave.,  Novosibirsk, 630090, Russia, Subetto D.A. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia,   Herzen University, 48 Moika Embankment, Saint-Petersburg, 191186, Russia, Efremenko N.A. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Potakhin M.S. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Kulik N.V. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Gatalskaya E.V. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Ryabinkin A.V. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Kukharev V.I. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Rybalko A.E. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia,   Arctic and Antarctic Research Institute, 38 Bering str., Saint-Petersburg, 199397, Russia, Zdorovennova G.E. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Zdorovennov R.E. ,   Northern Water Problems Institute KRC RAS, 50 Aleksander Nevsky str., Petrozavodsk, 185030, Russia, Ludikova A.V. ,   Institute of Limnology RAS, 9 Sevastianova str., Saint-Petersburg, 196105, Russia
Published: September 2022

Abstract. The data on studies of sedimentation processes in the Lake Onego were collected. The research program includes monitoring of atmospheric precipitation, the river flow, the distribution of suspended matter in the water column, the flow of suspended matter to the bottom and point source of pollution. The distribution and accumulation rates of sedimentary matter in the lake were determined. The composition of sedimentary matter has been studied.
Evolution of vegetation in the Utinoe Lake basin (the Russian Far East) during the Middle-Late Holocene
Authors: Belyanin P.S. ,   The Pacific Geographical Institute of the Far Eastern Branch of the Russian Academy of Sciences, Radio Str., 7, Vladivostok, 690041, Russia, Belyanina N.I. ,   The Pacific Geographical Institute of the Far Eastern Branch of the Russian Academy of Sciences, Radio Str., 7, Vladivostok, 690041, Russia
Published: September 2022

Abstract. Evolution of vegetation in the Utinoe Lake basin was studied. Periodicity of vegetation changes in its basin were reconstructed by the palynological data. The Middle Holocene stage of the vegetation evolution proceeded in the conditions of general planetary increase in average annual temperatures, accompanied by flooding of lowland plains by the Sea of Japan. Composition of the polydominant forests on the ridges during the Middle-Late Holocene was more rich what the present time were formed. Vegetation of the foothill plains was represented with sedge and mixed meadows. The Late Holocene stage was characterized by a decrease in average annual temperatures and series of climatic changes. Its beginning was marked by the cooling, during which the coastal lowlands were freed from sea waters. Climate deterioration caused expansion of dark coniferous and small-leaved plants in the Utinoe Lake basin, as well as reduction of polydominant forests. On the foothills near the coast of the Peter the Great Bay sedge meadows were developed, sometimes there were thickets of Betula sect. Nanae and sphagnum swamps. At the end of the Late Holocene the warming occurred again. On the mountain frame of the Utinoe Lake basin, the vegetation formations with the dominance Q. mongolica, Q. dentata, A. holophylla, P.koraiensis with the presence of birches began to dominate. The dissemination of Pinus densiflora, Ulmus, Carpinus cordata and Acer has increased. On the lowlands the sedge-reed meadows with different grass dominated.
Approaching a new theory on Caspian Sea response to global climate changes during MIS2 - MIS1: generalization and reassessment of 18O data
Authors: Berdnikova A.A. ,   Lomonosov Moscow State University, Leninskye gory, 1, Moscow, 119991, Russia, Tkach N.T. ,   Lomonosov Moscow State University, Leninskye gory, 1, Moscow, 119991, Russia, Zenina M.A. ,   P.P. Shirshov Institute of Oceanology, Russian Academy of Science, Nakhimovsky Prospect, 36, Moscow, 117997, Russia
Published: September 2022

Abstract. The study represents correlation 18O records from the Caspian basin together with available stable oxygen data on the continual sequence of deep-sea cores and on Kara-Bogaz-Gol Gulf, nearby lakes, and caves to complete palaeogeographical reconstruction of the Caspian Sea region. Typical Quaternary caspian ostracods shells and valves were measured for the 18O analysis. Oxygen isotope data allowed to correlate region transgressive-regressive events with glacial-interglacial rhythm and global climate changes. It was distinguished three main evolution stages of the Caspian Sea region, including the Last Ice Sheet degradation with a series of step-like environmental shifts matching the sequence of abrupt cooling/warming events; abrupt warming at the beginning of the Holocene; and climatic fluctuations of a smaller scale and different sets during the second part of the Holocene. It was established that Caspian Sea level oscillations occur as a response to climatic changes among numerous probable causes. Transgressions were usually accompanied by the freshening of water and cold climate while regressions were primarily correspond to increased salinities and warm climate. The reconstruction of the Caspian Sea hydro-climatic changes was confirmed by observed similar trends in the oxygen isotope record of nearby regions.
Late Glacial and Holocene environmental history of the Oka Plateau, East Sayan Mountains (Siberia): a palaeolimnological study of several lakes
Authors: Bezrukova E.V. ,   Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky Str., 1A, Irkutsk, 664033, Russia, Reshetova S.A. ,   Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky Str., 1A, Irkutsk, 664033, Russia, Kulagina N.V. ,   Institute of the Earths Crust, Siberian Branch of the Russian Academy of Sciences, Lermontov Str., 128, Irkutsk, 664033, Russia, Volchatova E.V. ,   Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky Str., 1A, Irkutsk, 664033, Russia, Tkachenko L.L. ,   Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky Str., 1A, Irkutsk, 664033, Russia, Shchetnikov A.A. ,   Institute of the Earths Crust, Siberian Branch of the Russian Academy of Sciences, Lermontov Str., 128, Irkutsk, 664033, Russia, Krainov M.A. ,   Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences, Favorsky Str., 1A, Irkutsk, 664033, Russia, Filinov I.A. ,   Institute of the Earths Crust, Siberian Branch of the Russian Academy of Sciences, Lermontov Str., 128, Irkutsk, 664033, Russia
Published: September 2022

Abstract. Palaeoenvironmental changes including vegetation, chemical weathering intensity, lake s water level fluctuations, and climate dynamics in the East Sayan Mountains were investigated using pollen, mineralogical, petromagnetic, X-ray fluorescence analyses and radiocarbon dating. Based on these data sets from three high-mountain lakes, we reconstructed the variations in local and regional vegetation, biomes, and climate during the Late Glacial and Holocene in the Oka Plateau, East Sayan Mountains, and the surrounding areas.
Long-chain alkenones in the lake sediments of North-Minusinsk Basin (South Siberia): implications for paleoclimate reconstructions
Authors: Bulkhin A.O. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia,   Siberian Federal University (SibFU), 79 Svobodny ave., Krasnoyarsk, 660041, Russia, Zykov V.V. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia, Marchenko D.N. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia,   Siberian Federal University (SibFU), 79 Svobodny ave., Krasnoyarsk, 660041, Russia, Boyandin A.N. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia, Rogozin D.Y. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia,   Siberian Federal University (SibFU), 79 Svobodny ave., Krasnoyarsk, 660041, Russia
Published: September 2022

Abstract. The core-top calibration study of 22 lakes indicates that in salt lakes the total alkenones increase sharply at a salinity of about 20 g/L, while alkenones are absent in the sediments of freshwater lakes. For the first time, this study shows that the Uk40 and Uk40 unsaturation indices are positively correlated with salinity and thus can be used to reconstruct salinity. The C37/C38 ratio is negatively correlated with salinity, and therefore this parameter can be used as an indicator of salinity. Also, the %C37:4 indicator is not correlated with salinity. It was found that the average chain length of alkenones increases with salinity, but the correlation was weak. Analysis of the alkenone composition and 18S rRNA suggests that all lakes are inhabited by Group II haptophytes, except for one freshwater lake, where the Group I of LCA-producing haptophytes was found. The taxonomic composition of haptophyte algae and the alkenone composition in the lakes were comparable to those in the lakes of the Canadian Prairies, apparently due to the similarity of climatic factors and the ionic composition of lake water in the two regions.
Macro-charcoal particles in lake sediments of North-Minusinsk Basin (South Siberia, Russia) as indicator of natural and human-induced paleo-fires
Authors: Burdin L.A. ,   Siberian Federal University (SibFU), 79 Svobodny ave., Krasnoyarsk, 660041, Russia, Bolobanshchikova G.N. ,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia, Rogozin D.Y. ,   Siberian Federal University (SibFU), 79 Svobodny ave., Krasnoyarsk, 660041, Russia,   Institute of Biophysics SB RAS, 50/50 Akademgorodok str., Krasnoyarsk, 660036, Russia
Published: September 2022

Abstract. Microscopic analysis of the core from the bottom sediments of Lake Shira (southern Siberia, Khakassia, Russia), have shown that for the last 100 years the sedimentation flux of charcoal particles sharply increased. This increase is consistent with the results for many lakes in the world and is presumably due to the current increase in anthropogenic impact, both in the form of accidental and deliberate arson, and in the form of burning wood and coal for heating residential buildings and recreation in the area adjacent to the lake. A flux of charcoal particles >100 m into Lake Shira was estimated base on sedimentation traps in 2012-2019. It was shown that the particle flux increasing from October to May, which can be explained by two factors: the burning of fuel from surrounding villages at cold time and fires of steppe in April-May. During the warm season, this flow are significantly decreased, therefore, a impact of campfires is likely minor compare to village sources. Our data show a significant contribution of anthropogenic factors to the flow of coal particles from burning fuel and spring fires.
Paleolimnological reconstructions for Lake Arakhley (Central Transbaikalia, Russia) inferred from high-resolution reflection seismic data
Authors: Chensky D.A. ,   National Research Irkutsk State Technical University, 83 Lermontov str., Irkutsk, 664074, Russia, Gubin N.A. ,   National Research Irkutsk State Technical University, 83 Lermontov str., Irkutsk, 664074, Russia, Kazantsev V.A. ,   Institution of Science Institute of Natural Resources, Ecology and Cryology of SB RAS, 26 Butina str., Chita, 672014, Russia, Fedotov A.P. ,   Limnological Institute SB RAS, 3 Ulan-Batorskaya str., Irkutsk, 664033, Russia
Published: September 2022

Abstract. High-resolution seismic data (65 km profiles) have been used to study the sedimentary infill of Ivan-Arakhley lake system (Lakes Arakhley, Ivan and Shakshinskoe). It found that full limnological cycle bears only sediment cover of Lake Arakhley. Total sediment infill of Lake Arakhley is 6-7 m, and it was be divided into three sequences. The uppermost ~2.5 m of sediment cover was presented by a normal lacustrine filling. Lacustrine sediments began to form ca. 21 cal. ka BP. The lake was almost dried during the regression occurred between ca. 3 and 2.6 cal. ka BP.
Late Holocene vegetation history of the Western Caucasus inferred from high-resolution pollen record from Lake Karakel
Authors: Chepurnaya A.A. ,   Lomonosov Moscow State University, 1 Leninskiye gory, Moscow, 119991, Russia, Novenko E.Y. ,   Lomonosov Moscow State University, 1 Leninskiye gory, Moscow, 119991, Russia,   Institute of Geography RAS, 29 Staromonetniy lane, Moscow, 119017, Russia, Aleksandrin M.Y. ,   Institute of Geography RAS, 29 Staromonetniy lane, Moscow, 119017, Russia
Published: September 2022

Abstract. The paper presents a new paleoecological evidence for the last 2200 years based on high resolution pollen record and detail radiocarbon dating, obtained from Lake Karakel (Teberda River valley, Western Caucasus). The obtained results showed that vegetation changes from 2200 to stage 1200 cal, yr BP occurred under a climate warming and increase of humidity. The Medieval Climatic Anomaly-MCA (ca. 1200-880 cal. yr BP) was characterized in this region by the predominance of broadleaved forests. The MCA was followed by a cold interval of the Little Ice Age (ca. 880-120 cal yr BP) that marked by expansion of pine, spruce and fir forests to the lower altitude the present time.
Lake sediments as archives of early anthropogenic impact on the landscapes of the Vishtynets Upland (Kaliningrad region RF, SE Baltic)
Authors: Druzhinina O. ,   Herzen University, 48 Moika Embankment, St. Petersburg, 191186, Russia
Published: September 2022

Abstract. The study of lake sediments contributes to the understanding of the types and intensity of anthropogenic impact on the landscapes of the Vishtynets Upland (Southeastern Baltic) in prehistoric times and the Middle Ages by combining available paleoecological and archaeological information. The results of lithological, paleobotanical and geochemical studies, together with archaeological data, have allowed a deeper understanding of the dynamics of anthropogenic impact in the area, including the emergence of agriculture and ancient metallurgy. Archaeological data testify to the presence of human activity on the Vishtynets Upland from the Late Paleolithic, and applied paleolimnological analysis revealed the first signs of anthropogenic impact, starting from the Late Mesolithic and Neolithic, and intensifying it from the Bronze Age.
Cladocera remains in reconstructions of past ecological conditions of the Yamal Peninsula
Authors: Ibragimova A.G. ,   Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russia,   A.N. Severtsov Institute of Ecology and Evolutionof the Russian Academy of Sciences, Leninsky Prospekt Str., 33, Moscow, 119071, Russia, Nigmatullin N.M. ,   Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russia, Nigamatzyanova G.R. ,   Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russia, Salnikova E.Yu. ,   Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russia, Frolova L.A. ,   Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russia
Published: September 2022

Abstract. The aim of this study is to explore the Cladocera community from the bottom sediments of small unnamed lake (21-Ya-02B) whilst attempt to reconstruct the ecological and climatic conditions for the Yamal Peninsula. In total, remains of 37 taxa were identified in bottom sediments of the lake. Cladocera community in the lower layers at the column is represented by low taxonomic abundance and typical northern species. On the depth of 65-40 cm the maximum number of taxa was identified, which allows it to be considered the temperature optimum zone of Cladocera. Changes in the upper layers of the column may indicate climate warming in the study area and, as a consequence, thawing of permafrost.
Lithochemical parameters in equilibrium systems of modern sedimentation in lakes and on the sea shelf
Authors: Kalugin I.A. ,   Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug ave., Novosibirsk, 630090, Russia, Gaskova O.L. ,   Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug ave., Novosibirsk, 630090, Russia,   Novosibirsk State University, 1 Pirogov str., Novosibirsk, 630090, Russia, Meydan A.F. ,   Yuzuncu Yil University, Faculty of Geological Engineering, Van, 65000, Turkey, Babich V.V. ,   Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug ave., Novosibirsk, 630090, Russia, Markovich T.I. ,   Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug ave., Novosibirsk, 630090, Russia, Astakhov A.S. ,   Ilyichev Pacific Oceanological Institute FEB RAS, 43 Baltiyskaya str., Vladivostok, 690041, Russia
Published: September 2022

Abstract. The work combines physicochemical and statistical modeling in the description of marine and continental salt water bodies. Sedimentary systems consist of aluminosilicate, carbonate and organogenic source material. Paleoclimatic changes are traditionally considered in the time scale. However, the real fluctuation amplitude of the target natural parameter is usually absent or has insufficient resolution for quantitative paleoclimatic reconstructions. Accessible quantitative analysis of time series is based on mineralogy and geochemistry of bottom sediments. Ahalytical complex includes X-ray phase diagnostics of minerals, SEM and XRF analysis of bulk chemical composition, isotopic dating and counting of annual rhythms. Modern high-resolution techiquem like scanning XRF SR with a measurement step of 1 mm successfully provides the necessary synchronization between analytical data and instrumental seasonal-annual observations. Multiple regression methods are used to calculate the transfer functions for transforming the elemental composition of sediments into time series of the desired target environment. Additional physicochemical equilibrium estimates of sedimentation were calculated, confirming the convergence of the parameters of the selected multisystem (rock + liquid + gas) with environmental conditions. For equilibrium systems, time series of absolute values of the desired parameters, such as temperature, salinity, pH, redox environment, etc., were calibrated with synchronous weather and climate fluctuations. In particular, the reconstruction of marine sediments opened up the prospect of studying the periodicity of ice-free periods in the Arctic Ocean, using quantitative estimates of external conditions from the lithochemistry of bottom sediments.
New data on the rise of Lake Ilmen (NW, Russia) in the Holocene
Authors: Komagorova M.A. ,   Fersman Mineralogical Museum RAS, 18/2 Leninskiy prospect, Moscow, 119071, Russia, Borisevich E.A. ,   Novgorod State University, 41 Bolshaya Sankt-Peterburgskaya str., Velikiy Novgorod, 173003, Russia
Published: September 2022

Abstract. This paper discusses a rise of Lake Ilmen in the Holocene, its origin, and consequences for the Neolithic culture of the region. We assume that in the second half of the Holocene there was a long-lasting level rise of Lake Ilmen. The level rise was associated with the Holocene Ladoga transgression into the Ilmen-Volkhov basin.
History of the Belye Lakes (the Tsars valley, Tuva Republic, Russia) in the Late Pleistocene and Holocene
Authors: Konstantinov E.A. ,   Institute of Geography of the Russian Academy of Sciences, Staromonetniy Lane, 29, Moscow, 119017, Russia, Panin A.V. ,   Institute of Geography of the Russian Academy of Sciences, Staromonetniy Lane, 29, Moscow, 119017, Russia, Rudinskaya A.I. ,   Institute of Geography of the Russian Academy of Sciences, Staromonetniy Lane, 29, Moscow, 119017, Russia, Borisova O.K. ,   Institute of Geography of the Russian Academy of Sciences, Staromonetniy Lane, 29, Moscow, 119017, Russia
Published: September 2022

Abstract. According to the study of bottom sediments, the Belye Lakes (near the famous mound Arzhaan-2) begun to exist about 16.5 ka. The lakes formed in a local depression at the site of the alluvial fans of temporary rivers, which is marked by red sands in cores. A three-meter lacustrine stratum overlies the sands, in some places with interbeds of peat, with a variable content of organic matter and carbonates along the section. Lithological, diatom and pollen analyzes show that the lake has always been shallow. The minimum flowability of the lake, indicating drier conditions, existed 10.0-4.2 ka and for the last 2.0 ka. During the middle of the Holocene (between 8.3-4.2 ka) it could dry up temporarily.
Lakes of Eurasian interior, which significantly raised their levels in the recent past
Authors: Krivonogov S.K. ,   Sobolev Institute of Geology and Mineralogy SB RAS, 3 Academician Koptyug ave., Novosibirsk, 630090, Russia
Published: September 2022

Abstract. The paper presents geomorphological evidences of former appearances of huge lakes in Mongolia and in the south of Siberia visible on satellite images. Most of lakes in Mongolia and transboundary Russia are terminal basins collecting waters from catchments of large rivers draining the Altai, Khangai and Khentey Mountains, while in the south of Siberia such lakes had no sizeable sources for water input. The discussing reasons for these rises are obviously climatic with possible high influence of deglaciation processes in the surrounding mountains.
Lake sediments of the Kindo Peninsula and its surroundings (Karelian Coast of the White Sea) Holocene stratigraphy and dynamics of organic accumulation
Authors: Kuznetsov D.D. ,   Institute of Limnology of the Russian Academy of Sciences  SPC RAS, Sevastjanova Str., 9, St.-Petersburg, 196105, Russia, Ludikova A.V. ,   Institute of Limnology of the Russian Academy of Sciences  SPC RAS, Sevastjanova Str., 9, St.-Petersburg, 196105, Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, Moika Emb., 48, St.-Petersburg, 191186, Russia, Kublitsky Yu.A. ,   Herzen State Pedagogical University of Russia, Moika Emb., 48, St.-Petersburg, 191186, Russia, Leontev P.A. ,   Herzen State Pedagogical University of Russia, Moika Emb., 48, St.-Petersburg, 191186, Russia, Potakhin M.S. ,   Karelian Research Center of the Russian Academy of Sciences, Pushkinskaya Str.,11, Petrozavodsk, 185910, Russia,   Petrozavodsk State University, Lenin Str., 33, Petrozavodsk, 185910, Russia
Published: September 2022

Abstract. Sediment stratigraphy and dynamics of organic accumulation of eight small isolation basins at the Kindo Peninsula and its surroundings (Karelian Coast of the White Sea) were studied. The sediments structure and organic matter dynamics were found to depend on the age of the isolation that, in turn, depends on the lake s elevation. The thickest gyttja layer (up to 3 m) with loss-on-ignition values ca 60% formed in the lakes at the highest elevations. The thickness of marine-lacustrine transitional units varies from few cm to tens cm. The earlier isolation from the sea took place the thinner the transitional unit. In the lakes where isolation has not finished yet, the transitional sediments with LOI values ca 20-30% still form.
Present sedimentation in the volcanic lakes of the Kurile-Kamchatka region (Russia) as a basis for paleoreconstructions
Authors: Lebedeva E.V. ,   Institute of Geography, Russian Academy of Science, Staromonetny s-str., 29, Moscow, 119017, Russia
Published: September 2022

Abstract. The results of modern processes observations of the sedimentation in the volcanic lakes of the region are summarized with the use of material from other regions of the world. The available data on the drained volcanic lakes deposits, Uzon-Geysernaya caldera as example, was analysed. The main sources of material (volcanic and post-volcanic activity, gravitational displacements on slopes, and erosion-denudation processes) and the mechanisms of its entry into volcanic lakes, as well as the features of the subsequent deposits transformation as a result of hydrothermal, seismic, and volcano-tectonic activity, are identified. The results of the studies carried out allow us to conclude that the volcanic lakes deposits are complexly constructed polyfacial complexes with alternating fine-grained lacustrine and lacustrine-swamp deposits with pyroclastic horizons and interlayers of untreated or poorly processed coarse clastic material coming as a result of volcano-tectonic activity, gravitational and erosion processes. The irregularity of horizons along strike is typical; and is characterized by the large-scale sediments deformation under the influence of seismic activity, growth of effusive and extrusive domes, phreatic explosions, etc. Hydrothermal activity contributes to the weathering and cementation of the lake sediments. Lava outpourings and the high-temperature pyroclastic flows provokes sintering of contacting horizons sediments.
The evolution of the ecosystem of the Unitskaya Bay (Lake Onega) in the late- and postglacial times as inferred from the siliceous microalgae study
Authors: Ludikova A.V. ,   Institute of Limnology of the Russian Academy of Sciences, St. Petersburg Federal Research Center of the Russian Academy of Sciences, Sevastyanova str. 9, St Petersburg, 196105, Russia, Belkina N.A. ,   Northern Water Problems Institute, Karelian Research Centre, Alexander Nevsky pr. 50, Petrozavodsk, 185030, Karelia, Russia, Strakhovenko V.D. ,   V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch Russian Academy of Sciences, Akademika Koptuga pr. 3, Novosibirsk, 630090, Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, Moika 48, St. Petersburg, 191186, Russia
Published: September 2022

Abstract. The study of the siliceous microalgae (diatoms and chrysophytes) enabled reconstructing the evolution of the ecosystem of the Unitskaya Bay, the northern bay of Lake Onega. Changes in the composition of diatom assemblages, floristic diversity and abundances of siliceous microalgae indicated past productivity changes, as well as shifts in duration of hydrological and biological seasons.
Geochemical and mineral composition of bottom sediments of the last glaciosedimentation cycle from Lake Onega (NW, Russia)
Authors: Malov V.I. ,   V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug Prospect, Novosibirsk, 630090, Russia, Strahovenko V.D. ,   V.S. Sobolev Institute of Geology and Mineralogy SB RAS, 3 Akademik Koptyug Prospect, Novosibirsk, 630090, Russia, Subetto D.A. ,   Herzen State Pedagogical University of Russia, 48 Moika Embankment, Saint-Petersburg, 191186, Russia, Rybalko A.V. ,   A.P. Karpinsky Russian Geological Research Institute (VSEGEI), 74 Sredny Prospect, St. Petersburg, 199106, Russia, Belyaev P.S. ,   A.P. Karpinsky Russian Geological Research Institute (VSEGEI), 74 Sredny Prospect, St. Petersburg, 199106, Russia, Belkina N.A. ,   Northern Water Problems Institute of the Karelian Research Centre RAS, 50 Alexander Nevsky Prospect, Petrozavodsk, 185030, Russia, Potakhin M.S. ,   Northern Water Problems Institute of the Karelian Research Centre RAS, 50 Alexander Nevsky Prospect, Petrozavodsk, 185030, Russia
Published: September 2022

Abstract. The study of the geochemical and mineral composition of the bottom sediments of Lake Onega (the Petrozavodsk Bay) described fundamental differences between the chemical composition of sediments formed at the Holocene and Upper Pleistocene. It suggested the reason for mechanical to chemical type of weathering.
Quantitative assessment of carbon sequestration by sapropel deposits inferred from Lakes Peschanoe and Nizhnee (Western Siberia, Russia)
Authors: Malov G.I. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences (IGM SB RAS), 3 Akad. Koptyug Ave., Novosibirsk, 630090, Russia, Ovdina .. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences (IGM SB RAS), 3 Akad. Koptyug Ave., Novosibirsk, 630090, Russia, Strakhovenko V.D. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences (IGM SB RAS), 3 Akad. Koptyug Ave., Novosibirsk, 630090, Russia
Published: September 2022

Abstract. Comprehensive studies of chemical and mineral composition of two lake systems on the territory of the Baraba lowland in the south of western Siberia was carried out. The reserves of sapropel and carbon were calculated for each lake. Sources supply of material and forms of carbon burial in the bottom sediments were identified.
Geochemical indication of the Holocene climatic changes in sediments of Bolshoi Bagan Lake, Southern West Siberia
Authors: Maltsev A.E. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Krivonogov S.K. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Miroshnichenko L.V. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Leonova G.A. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Smolentseva E.N. ,   Institute of Soil Science and Agrochemistry, Siberian Branch of the Russian Academy of Science, Academician Lavrentiev ave., 8/2, Novosibirsk, 630090, Russia, Shavekin .S. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia, Solotchin P.A. ,   Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Science, Academician Koptyug ave., 3, Novosibirsk, 630090, Russia
Published: September 2022

Abstract. Our study of the Holocene sediments of shallow saline Lake Bolshoy Bagan located revealed the following stages of the lake evolution: (I) Appearance and maturing of the lake 9.1 5.8 ka BP; (II) rise in water level 5.8 2.3 ka BP; and (III) shallowed lake 2.3 0 ka BP.
The dynamics of vegetation and environmental conditions in the southern Yamal Peninsula during the Holocene inferred from the palynological analysis of lake sediments
Authors: Nigamatzyanova G.R. ,   Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russian Federation, Nigmatullin N.M. ,   Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russian Federation, Valieva E.A. ,   Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russian Federation, Frolova A.A. ,   Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russian Federation, Frolova L.A. ,   Kazan Federal University, 18 Kremlyovskaya street, Kazan, 420008, Russian Federation
Published: September 2022

Abstract. Based on the palynological analysis of the bottom sediment column of the arctic lake with the code name 21-Ya-01A of the Erkuta River basin from the southeastern part of the Yamal Peninsula, we received preliminary information on climatic changes, as well as on changes in vegetation character in the area around the water body. According to the results of the palynological analysis, the area around lake 21-Ya-01A was occupied during the Holocene by tree species (dwarf birch, spruce, larch) and characterized by a much warmer climate than today. It has been determined that the lower part of the column from 122 cm to 95 cm formed when dwarf vegetation and light birch-spruce forests covered the territory at that time. The middle part of the column from 95 cm to 15 cm laid under more favorable conditions - the climate was warmer and wetter than in the previous phase. It can be assumed from the spectra from 15 cm to 0 cm of the column that the climate was characterized by even colder temperatures and that the territory turned into a dwarf shrub yernik tundra.
Subfossil records of Cladocera from the tundra Lake Yambeto in the Yamal Peninsula
Authors: Nigmatullin N.M. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Nigamatzyanova G.R. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Valieva E.A. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Tumanov O.N. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia, Frolova L.A. ,   Kazan Federal University, Kremlyovskaya Str., 4/5, Kazan, 420008, Russia
Published: September 2022

Abstract. We performed a paleoecological study of a 124-cm-long sediment core from Lake Yambeto (southern part of the Yamal Peninsula, Yamalo-Nenets Autonomous Okrug, Russia), which consists of a series of lake basins varying in depth (up to 6.9 m) and merged with each other. The species composition of subfossil cladocerans was analyzed: a total of 26 taxa from 5 families were identified; of them, 73% belonged the family Chydoridae, thus ranking it as the most diverse. The cladoceran assemblage was dominated by Holarctic and Palearctic species, with Bosmina (Eubosmina) longispina, Bosmina longirostris, and Chydorus cf. sphaericus as the most abundant. The mean saprobity index (1.52) characterized the lake as -mesosaprobic.
The early Holocene paleogeography of Yurumkuveem river basin (Central Chukotka)
Authors: Petrov D.V. ,   North-Eastern Interdisciplinary Research Institute, Far East Branch, Russian Academy of Sciences, Portovaya st., 16, Magadan, 685000, Russia, Danilov G.K. ,   Peter the Great Museum of Anthropology and Ethnography, Kunstkamera, Russian Academy of Sciences, Universitetskaya Embankment 3, Saint-Petersburg, 199034, Russia,   North-Eastern Interdisciplinary Research Institute, Far East Branch, Russian Academy of Sciences, Portovaya st., 16, Magadan, 685000, Russia, Oskolski A.A. ,   Department of Botany and Plant Biotechnology, University of Johannesburg, PO Box 524 Auckland Park 2006, Johannesburg, South Africa,   Botanical Museum, Komarov Botanical Institute, Prof. Popov st. 2, Saint-Petersburg, 197376, Russia, Tsygankova V.I. ,   North-Eastern Interdisciplinary Research Institute, Far East Branch, Russian Academy of Sciences, Portovaya st., 16, Magadan, 685000, Russia, Vartanyan S.L. ,   North-Eastern Interdisciplinary Research Institute, Far East Branch, Russian Academy of Sciences, Portovaya st., 16, Magadan, 685000, Russia
Published: September 2022

Abstract. Results of radiocarbon dating and spore-pollen analysis of lacustrine sedi ments in the Nyrki sectionfrom the Yurumkuveem river basin (Central Chukotka) show the wider distribution of floodplain forests and the warmer climate in this time in the region in the early Holocene than in the present time. The occurrence of larch (Larix) in the vicinity of Nyrki lake in the early Holocene is also discussed. Our data suggest that the larch range was expanded to the Yurumkuveem river valley and its inflows during the early Holocene, but this tree disappeared from there in the late Holocene.
Seasonal sedimentation in saline Lake Shira (Siberia, Russia) and meromixis: implications for regional paleoclimate reconstructions
Authors: Rogozin D.Y. ,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok Str., Krasnoyarsk region, Krasnoyarsk, 660036, Russia;,   Siberian Federal University (SibFU), 79 Svobodny Pr., Krasnoyarsk region, Krasnoyarsk, 660041, Russia;, Darin A.V. ,   Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga Pr., Novosibirsk, 630090, Russia, Zykov V.V. ,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok Str., Krasnoyarsk region, Krasnoyarsk, 660036, Russia;, Kalugin I.A. ,   Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga Pr., Novosibirsk, 630090, Russia, Bulkhin A.O. ,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok Str., Krasnoyarsk region, Krasnoyarsk, 660036, Russia;,   Siberian Federal University (SibFU), 79 Svobodny Pr., Krasnoyarsk region, Krasnoyarsk, 660041, Russia;
Published: September 2022

Abstract. Detailed studies of processes of sediment record formation are necessary for accurate sediment-derived paleo-environmental reconstructions. We conducted the multi-year seasonal sediment evolution of sediment fluxes of chemical elements, organic and inorganic carbon, total nitrogen, and photosynthetic pigments for a period from 2012 to 2017. In 2013, 2016, 2017, and 2018, we estimated the contents of photosynthetic pigments in the uppermost sediment layers frozen in situ with a freeze-corer. In 2015 and 2016, a rare event of transition from meromixis (i.e. long-term hypolimnetic anoxia) to holomixis was observed, which was accompanied by the temporary disappearance of hydrogen sulfide from the water column in spring and a decrease in hydrogen sulfide in other seasons compared to the meromictic state. We have demonstrated that okenone and Mo in the Lake Shira sediments reflect the presence of hydrogen sulfide in the water column. However, the okenone showed smoothened multi-year dynamics without a pronounced seasonal one. Therefore, the okenone can be a proxy of sulphidic conditions in photic zone and weakly depend on seasons whereas Mo can be used as an indicator of winter periods when analyzed in cores with annual resolution. Sedimentation fluxes of other substances showed typical seasonal dynamics with a minimum in winter and a maximum in late summer and autumn. All chemical elements in the sedimentation flow can be roughly divided into those associated with organic matter and terrigenous-chemogenous. The components of the second group showed a pronounced peak of sedimentation in autumn 2012 and summer 2017 presumably due to the increased amount of precipitation at that time. This demonstrates the relationship between the terrigenous components and the climate humidity for this lake. Besides, it reflects the irregularity of annual varves composition.
Late Pleistocene Lakes of the Manych Depression (Caspian and Azov-Black Sea basins, Russia)
Authors: Semikolennykh D.V. ,   Russian Academy of Sciences, Institute of Geography, Staromonetny lane 29, 119017, Moscow, Russia, Kurbanov R.N. ,   Russian Academy of Sciences, Institute of Geography, Staromonetny lane 29, 119017, Moscow, Russia,   Moscow State University, Faculty of Geography, Leninskiye Gory Str., 1, Moscow, 119992, Russia, Yanina T.A. ,   Russian Academy of Sciences, Institute of Geography, Staromonetny lane 29, 119017, Moscow, Russia,   Moscow State University, Faculty of Geography, Leninskiye Gory Str., 1, Moscow, 119992, Russia
Published: September 2022

Abstract. The first geochronological data have been obtained for the lacustrine deposits of the Manych Depression, discovered by a borehole. It was found that two horizons (burtass and gudilovsky) of sedimentation were distinguished in the lacustrine deposits separated by an erosion gap. The age of the Burtass Lake deposits is estimated at 78-100 ka years ago (MIS 5), Gudilovsky Lake 25-64 ka years ago (MIS 3).
Fecal stanoles in sediments of Lake Shira (Siberia, Russia) as a proxy of human impact on surrounding territory in the Late Holocene
Authors: Sinner E.K. ,   Siberian Federal University (SibFU), 79 Svobodny Pr., Krasnoyarsk region, Krasnoyarsk, 660041, Russia, Boyandin A.N. ,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok St., Krasnoyarsk region, Krasnoyarsk, 660036, Russia, Bulkhin A.O. ,   Siberian Federal University (SibFU), 79 Svobodny Pr., Krasnoyarsk region, Krasnoyarsk, 660041, Russia,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok St., Krasnoyarsk region, Krasnoyarsk, 660036, Russia, Rogozin D.Y. ,   Siberian Federal University (SibFU), 79 Svobodny Pr., Krasnoyarsk region, Krasnoyarsk, 660041, Russia,   Institute of Biophysics Siberian Branch of the Russian Academy of Sciences (IBP SB RAS), 50/50 Akademgorodok St., Krasnoyarsk region, Krasnoyarsk, 660036, Russia
Published: September 2022

Abstract. The analysis of biochemical markers of fecal intake is one of the newest trend in paleo-limnology. Stanols (cholestanol, stigmastanol, etc.) produced by the intestinal microflora from sterols are indicators of fecal influx into a water body. Coprostanol is synthesized in the human intestine, therefore, the presence of coprostanolin bottom sediments can be used to reconstruct the dynamics of the population in the lake watershed and to evaluate the dynamics of fecal pollution. Using the gas chromatography method, we were the first to estimate the content of cholestanol and coprostanol in the dated core layers of the bottom sediments of Lake Shira. The raised proportion of coprostanol indicates an increase in fecal anthropogenic inflows into the lake in the modern period, as well as in earlier periods of the history of Khakassia, in particularly during the existence of the Yenisei Kyrgyz state (VIII - XIII centuries CE).
Climate signals in the Holocene bottom sediments of shallow saline lakes of the Southwestern Siberia
Authors: Solotchin P.A. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia, Solotchina E.P. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia, Kuzmin M.I. ,   A.P. Vinogradov Institute of Geochemistry Siberian Branch of the Russian Academy of Sciences, Favorskogo Str., 1a, Irkutsk, 664033, Russia, Maltsev A.E. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia, Leonova G.A. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia, Krivonogov S.K. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia, Zhdanova A.N. ,   V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, 3 Akad. Koptyug Pr., Novosibirsk, 630090, Russia
Published: September 2022

Abstract. We present the results of the study of the Holocene sediments from two shal low lakes of different salinity located in the East Baraba lowland (Southwestern Siberia). The research methods: X-ray diffractometry (XRD), IR spectroscopy, laser particle size analysis, AMS dating, etc. By the mathematical modeling of complex XRD patterns Mg-calcites with different Mg contents, excess-Ca dolomite and aragonite have been established in the assemblages of carbonate minerals. Based on studies of mineralogical-crystallochemical features and quantitative ratios of Ca-Mg carbonates the evolution stages of lakes corresponding to the regional cycles of aridization/humidization were identified and the correlations with global climatic events were carried out. The obtained results is an important source of new information about the Holocene climate in the Southwestern Siberia.