Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia
Perennial frost mounds identified as lithalsas occur in the Sentsa River valley of the Eastern Sayan Mountains, Russia. We report the first detailed study of permafrost in this region, based on analysis of the cryostructure and distribution of stable isotopes of oxygen and hydrogen, and ion concentr...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.1876 |
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ftrepec:oai:RePEc:wly:perpro:v:27:y:2016:i:3:p:285-296 2023-05-15T16:37:19+02:00 Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia Yurij K. Vasil'chuk Sergey V. Alexeev Sergey G. Arzhannikov Ludmila P. Alexeeva Nadine A. Budantseva Julia N. Chizhova Anastasia V. Arzhannikova Alla C. Vasil'chuk https://doi.org/10.1002/ppp.1876 unknown https://doi.org/10.1002/ppp.1876 article ftrepec https://doi.org/10.1002/ppp.1876 2020-12-04T13:31:25Z Perennial frost mounds identified as lithalsas occur in the Sentsa River valley of the Eastern Sayan Mountains, Russia. We report the first detailed study of permafrost in this region, based on analysis of the cryostructure and distribution of stable isotopes of oxygen and hydrogen, and ion concentrations from the ice‐rich cores of two lithalsas 3–7 m high. Their main cryostructures are reticulate and lenticular, with visible ice contents exceeding 50–60%. The vertical and lateral distribution of δ18О and δD values show a step‐by‐step mechanism of lithalsa growth: in the first stage a large lithalsa formed, and in the second stage a small lithalsa formed. The more negative isotope values of ice in the large lithalsa ice probably resulted from gradual release of isotopically depleted water from the central to peripheral part of the massif during ice segregation in water‐saturated fine‐grained lake sediments. Minor variations of isotope values suggest intensive recharge of lake‐fen and meteoric water supply during freezing and lithalsa growth. Copyright © 2015 John Wiley & Sons, Ltd. Article in Journal/Newspaper Ice permafrost RePEc (Research Papers in Economics) Permafrost and Periglacial Processes 27 3 285 296 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
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unknown |
description |
Perennial frost mounds identified as lithalsas occur in the Sentsa River valley of the Eastern Sayan Mountains, Russia. We report the first detailed study of permafrost in this region, based on analysis of the cryostructure and distribution of stable isotopes of oxygen and hydrogen, and ion concentrations from the ice‐rich cores of two lithalsas 3–7 m high. Their main cryostructures are reticulate and lenticular, with visible ice contents exceeding 50–60%. The vertical and lateral distribution of δ18О and δD values show a step‐by‐step mechanism of lithalsa growth: in the first stage a large lithalsa formed, and in the second stage a small lithalsa formed. The more negative isotope values of ice in the large lithalsa ice probably resulted from gradual release of isotopically depleted water from the central to peripheral part of the massif during ice segregation in water‐saturated fine‐grained lake sediments. Minor variations of isotope values suggest intensive recharge of lake‐fen and meteoric water supply during freezing and lithalsa growth. Copyright © 2015 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Yurij K. Vasil'chuk Sergey V. Alexeev Sergey G. Arzhannikov Ludmila P. Alexeeva Nadine A. Budantseva Julia N. Chizhova Anastasia V. Arzhannikova Alla C. Vasil'chuk |
spellingShingle |
Yurij K. Vasil'chuk Sergey V. Alexeev Sergey G. Arzhannikov Ludmila P. Alexeeva Nadine A. Budantseva Julia N. Chizhova Anastasia V. Arzhannikova Alla C. Vasil'chuk Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
author_facet |
Yurij K. Vasil'chuk Sergey V. Alexeev Sergey G. Arzhannikov Ludmila P. Alexeeva Nadine A. Budantseva Julia N. Chizhova Anastasia V. Arzhannikova Alla C. Vasil'chuk |
author_sort |
Yurij K. Vasil'chuk |
title |
Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
title_short |
Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
title_full |
Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
title_fullStr |
Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
title_full_unstemmed |
Lithalsas in the Sentsa River Valley, Eastern Sayan Mountains, Southern Russia |
title_sort |
lithalsas in the sentsa river valley, eastern sayan mountains, southern russia |
url |
https://doi.org/10.1002/ppp.1876 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
https://doi.org/10.1002/ppp.1876 |
op_doi |
https://doi.org/10.1002/ppp.1876 |
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Permafrost and Periglacial Processes |
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27 |
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3 |
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285 |
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296 |
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1766027606860234752 |