The Oxygen Isotope Composition of Late Pleistocene and Holocene Ice Wedges of Kotelny Island

Vasil'chuk, Yurij K; Makeev, V M; Maslakov, Alexey; Budantseva, Nadine A; Vasil'chuk, Alla Constantinovna; Chizhova, Julia N

doi:10.1134/s1028334x18090192

Cited by 3 publications

(7 citation statements)

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“…In the lower half of the section, four dates in the range of 43.9–46.7 cal ka BP were obtained. This allows us to assert that the beginning of the formation of the described stratum and the lower tier of IWs took place not earlier than 44.3 cal ka BP 43 . The irregular distribution of radiocarbon dates in the lower part of the section is quite consistent with its facial heterogeneity, that is, the alternation of floodplain and channel facies of alluvial sediments.…”

Section: Resultssupporting

confidence: 52%

“…Syngenetic wedge ice is characterized by very low δ 18 O values (from −34.9‰ to −31.0‰), 43 whereas the δ 18 O value in the modern syngenetic wedge ice sampled on the tidal flats of Buor‐Khaya Bay is −24.2‰. Thus, in some periods of the Bykovsky Yedoma formation, the mean January temperature was 12–15°C lower than that at present.…”

Section: Resultsmentioning

confidence: 90%

“…In some cases, the overlying wedges merge together with the wedges in the lower unit and form a single multitiered IW. The presence of horizons rich in well‐rounded fine gravel (or entirely composed of fine gravel) is, most likely, indicative of the alluvial genesis of the main part of the Bykovsky Yedoma 43 . In this area, the heads of small syngenetic IWs are confined to peat soils in the upper part of the section, and their tails enter the underlying sand with fine gravel.…”

Section: Resultsmentioning

confidence: 99%

“…Some of the forming wedges did not penetrate so deeply, and their tails ended in the clay layer. The total height of such wedges does not exceed 4 m 43 . The author's attention was drawn to the layers represented by coarse and fine gravel (Figure 5); often, the horizons of sand or clay also contained gravel inclusions.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of horizons rich in well-rounded fine gravel (or entirely composed of fine gravel) is, most likely, indicative of the alluvial genesis of the main part of the Bykovsky Yedoma. 43 In this area, the heads of small syngenetic IWs are confined to peat soils in the upper part of the section, and their tails enter the underlying sand with fine gravel. The cyclical development of IWs was also noted in the Bykovsky Yedoma section.…”

Section: Syngenetic Iws In Pleistocene Sediments With Inclusions Of R...mentioning

confidence: 99%

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Yedoma sediments with gravel and rock debris inclusions: Characteristics and origin

Vasil'chuk

2023

Permafrost & Periglacial

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Yedoma ice complex sediments with large syngenetic ice wedges (IW) are usually observed in outcrops in river valleys on permafrost plains and on sea coasts and lake shores in the north of Siberia, Alaska, and Canada. Less frequently, they occur in mountainous and foothill regions of East Siberia, for example, in the Upper Kolyma Upland and in river valleys of the Eastern Sayan Range and the Anabar Plateau, as well as in Alaska and Yukon. The author's materials on gravelly Yedoma with IWs in the intermountain basins, on mountain slopes, and on sea coasts and lake shores are presented. The obtained data allow a conclusion that gravelly Yedoma has mainly alluvial, lacustrine, and colluvial origins with an insignificant participation of aeolian processes. Occurrence of the late Pleistocene gravelly deposits with large syngenetic IWs confirms a hypothesis of polygenetic origin of Yedoma.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Syngenetic Iws In Pleistocene Sediments With Inclusions Of R...mentioning

confidence: 99%

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Yedoma sediments with gravel and rock debris inclusions: Characteristics and origin

Vasil'chuk

2023

Permafrost & Periglacial

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Geochemical Features of Ground Ice from the Faddeevsky Peninsula Eastern Coast (Kotelny Island, East Siberian Arctic) as a Key to Understand Paleoenvironmental Conditions of Its Formation

Pismeniuk

Semenov

Veremeeva

et al. 2023

Land

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Understanding paleoenvironmental conditions of the permafrost formation allows us to estimate the permafrost carbon pool and its behavior upon thawing in a changing climate. In order to classify different types of ground ice and to reconstruct paleoenvironments, we examined geochemical data of ice wedges (IWs), tabular ground ice (TGI), and lens ice from the eastern coast of the Faddeevsky Peninsula (East Siberian Arctic). We analyzed isotope and ion composition, molecular composition of the gas phase, bulk biogeochemical parameters and dissolved organic matter (DOM) composition in ground ice samples. IWs formed in the Late Pleistocene under the coldest winter conditions and in the Holocene in proximity to the sea. The Holocene IWs have the highest mean d-excess (11–13‰) and a heavier isotope composition by an average of 6‰ compared with the Late Pleistocene IWs. We observe predominance of sea-salt fractions in ion composition of the Holocene IWs, while the Late Pleistocene IW shows enrichment in non-sea-salt component of SO42- (nssSO42-), which is probably associated with mineral leaching of deposits. Higher dissolved organic carbon (DOC) content in the Late Pleistocene IW (to 17,7 mg/L) may indicate more favorable vegetation conditions or lower degree of organic matter mineralization compared to Holocene IWs and TGI. CH4 concentrations were relatively low with a maximum value of 2.27 μmol/L. DOM composition, supposed to record the paleoenvironment of the freezing process, was for the first time tried as a biomarker for paleoenvironmental reconstructions of ground ice formation. Parallel factor (PARAFAC) analysis of EEM (Excitation-Emission matrix) of fluorescent DOM decomposes four components: P1–P3, which are related to allochthonous humiс-like constituents, and P4, which is relevant to autochthonous fraction associated with microbial activity. The distribution of fluorescent DOM tracked the variability in both paleoclimate conditions of the IW formation (discriminating the Holocene and the Late Pleistocene IWs) and types of ground ice (IW and TGI), which demonstrates the potential of the used approach.

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Yedoma. Part 3. Annals of geocryological research, study of radiocarbon age, the stable-isotope composition studies in the 21st century

Vasil'chuk

2023

Арктика И Антарктика

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The second decade and the beginning of the third decade of the XXI century in yedoma research were characterized by a variety of high-precision measurements of gas inclusions, molecular biomarkers, and DNA. The purpose of this paper is to analyze the most notable publications of 2010–2023 devoted to radiocarbon dating and stable isotope studies of yedoma in the Russian and North American Arctic. AMS dating and stable isotope analysis continued at Lomonosov Moscow State University (Yu.K. Vasil’chuk, A.C. Vasil’chuk, N.A. Budantseva, I.D. Streletskaya, Ju.N. Chizhova, J.Yu. Vasil’chuk), especially detailed on the yedoma of Batagay, Seyakha, Kotelny, and Faddeevsky islands. Active research was continued by the participants of the Russian-German expedition (A. Yu. Derevyagin, A. I. Kizyakov, S. Wetterich, T. Opel, J. Strauss, G. Grosse and L. Schirrmeister) on the yedoma sections of the New Siberian Islands. They studied the Batagay yedoma together with J. Murton and K. Ashastina. Researchers from the University of Fairbanks (M. Kanevskiy, Y. Shur, M. Jorgenson, and E. Stephani) studied in detail the yedoma of the Itkillik River valley, as well as new yedoma sections in the Fox Tunnel, where radiocarbon and isotope studies were also carried out by M.S. Lachniet and A. Sloat from the University of Las Vegas. Research has begun on molecular biomarkers and DNA (E. Willerslev, T. Jørgensen) in yedoma. The study of PAHs in yedoma ice wedges has also begun (Yu.K. Vasil’chuk). It is emphasized that isotopic data is not an end in itself for research; the next step, paleotemperature reconstruction based on these data, is necessary and logically justified. The accuracy and reliability of the proposed paleotemperature-isotope equations are considered.

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The Oxygen Isotope Composition of Late Pleistocene and Holocene Ice Wedges of Kotelny Island

Cited by 3 publications

References 5 publications

Yedoma sediments with gravel and rock debris inclusions: Characteristics and origin

Yedoma sediments with gravel and rock debris inclusions: Characteristics and origin

Geochemical Features of Ground Ice from the Faddeevsky Peninsula Eastern Coast (Kotelny Island, East Siberian Arctic) as a Key to Understand Paleoenvironmental Conditions of Its Formation

Yedoma. Part 3. Annals of geocryological research, study of radiocarbon age, the stable-isotope composition studies in the 21st century

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