Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia
Biotracers marking the geologic history and permafrost evolution in Central Yakutia, including Yedoma Ice Complex (IC) deposits, were identified in a multiproxy analysis of water chemistry, isotopic signatures, and microbial datasets. The key study sections were the Mamontova Gora and Syrdakh exposu...
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ftdoajarticles:oai:doaj.org/article:0d38a88f61ee46d5b43d2bef35d0cfe1 2023-05-15T16:37:04+02:00 Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia M. Yu. Cherbunina E. S. Karaevskaya Yu. K. Vasil’chuk N. I. Tananaev D. G. Shmelev N. A. Budantseva A. Y. Merkel A. L. Rakitin A. V. Mardanov A. V. Brouchkov S. A. Bulat 2021-11-01T00:00:00Z https://doi.org/10.3389/feart.2021.739365 https://doaj.org/article/0d38a88f61ee46d5b43d2bef35d0cfe1 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2021.739365/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2021.739365 https://doaj.org/article/0d38a88f61ee46d5b43d2bef35d0cfe1 Frontiers in Earth Science, Vol 9 (2021) ice comlex yedoma Central Yakutia microbial community stable water isotopes hydrochemistry Science Q article 2021 ftdoajarticles https://doi.org/10.3389/feart.2021.739365 2022-12-31T10:33:26Z Biotracers marking the geologic history and permafrost evolution in Central Yakutia, including Yedoma Ice Complex (IC) deposits, were identified in a multiproxy analysis of water chemistry, isotopic signatures, and microbial datasets. The key study sections were the Mamontova Gora and Syrdakh exposures, well covered in the literature. In the Mamontova Gora section, two distinct IC strata with massive ice wedges were described and sampled, the upper and lower IC strata, while previously published studies focused only on the lower IC horizon. Our results suggest that these two IC horizons differ in water origin of wedge ice and in their cryogenic evolution, evidenced by the differences in their chemistry, water isotopic signatures and the microbial community compositions. Microbial community similarity between ground ice and host deposits is shown to be a proxy for syngenetic deposition and freezing. High community similarity indicates syngenetic formation of ice wedges and host deposits of the lower IC horizon at the Mamontova Gora exposure. The upper IC horizon in this exposure has much lower similarity metrics between ice wedge and host sediments, and we suggest epigenetic ice wedge development in this stratum. We found a certain correspondence between the water origin and the degree of evaporative transformation in ice wedges and the microbial community composition, notably, the presence of Chloroflexia bacteria, represented by Gitt-GS-136 and KD4-96 classes. These bacteria are absent at the ice wedges of lower IC stratum at Mamontova Gora originating from snowmelt, but are abundant in the Syrdakh ice wedges, where the meltwater underwent evaporative isotopical fractionation. Minor evaporative transformation of water in the upper IC horizon of Mamontova Gora, whose ice wedges formed by meltwater that was additionally fractionated corresponds with moderate abundance of these classes in its bacterial community. Article in Journal/Newspaper Ice permafrost wedge* Yakutia Directory of Open Access Journals: DOAJ Articles Gora ENVELOPE(42.420,42.420,63.021,63.021) Syrdakh ENVELOPE(130.691,130.691,61.985,61.985) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ice comlex yedoma Central Yakutia microbial community stable water isotopes hydrochemistry Science Q |
spellingShingle |
ice comlex yedoma Central Yakutia microbial community stable water isotopes hydrochemistry Science Q M. Yu. Cherbunina E. S. Karaevskaya Yu. K. Vasil’chuk N. I. Tananaev D. G. Shmelev N. A. Budantseva A. Y. Merkel A. L. Rakitin A. V. Mardanov A. V. Brouchkov S. A. Bulat Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
topic_facet |
ice comlex yedoma Central Yakutia microbial community stable water isotopes hydrochemistry Science Q |
description |
Biotracers marking the geologic history and permafrost evolution in Central Yakutia, including Yedoma Ice Complex (IC) deposits, were identified in a multiproxy analysis of water chemistry, isotopic signatures, and microbial datasets. The key study sections were the Mamontova Gora and Syrdakh exposures, well covered in the literature. In the Mamontova Gora section, two distinct IC strata with massive ice wedges were described and sampled, the upper and lower IC strata, while previously published studies focused only on the lower IC horizon. Our results suggest that these two IC horizons differ in water origin of wedge ice and in their cryogenic evolution, evidenced by the differences in their chemistry, water isotopic signatures and the microbial community compositions. Microbial community similarity between ground ice and host deposits is shown to be a proxy for syngenetic deposition and freezing. High community similarity indicates syngenetic formation of ice wedges and host deposits of the lower IC horizon at the Mamontova Gora exposure. The upper IC horizon in this exposure has much lower similarity metrics between ice wedge and host sediments, and we suggest epigenetic ice wedge development in this stratum. We found a certain correspondence between the water origin and the degree of evaporative transformation in ice wedges and the microbial community composition, notably, the presence of Chloroflexia bacteria, represented by Gitt-GS-136 and KD4-96 classes. These bacteria are absent at the ice wedges of lower IC stratum at Mamontova Gora originating from snowmelt, but are abundant in the Syrdakh ice wedges, where the meltwater underwent evaporative isotopical fractionation. Minor evaporative transformation of water in the upper IC horizon of Mamontova Gora, whose ice wedges formed by meltwater that was additionally fractionated corresponds with moderate abundance of these classes in its bacterial community. |
format |
Article in Journal/Newspaper |
author |
M. Yu. Cherbunina E. S. Karaevskaya Yu. K. Vasil’chuk N. I. Tananaev D. G. Shmelev N. A. Budantseva A. Y. Merkel A. L. Rakitin A. V. Mardanov A. V. Brouchkov S. A. Bulat |
author_facet |
M. Yu. Cherbunina E. S. Karaevskaya Yu. K. Vasil’chuk N. I. Tananaev D. G. Shmelev N. A. Budantseva A. Y. Merkel A. L. Rakitin A. V. Mardanov A. V. Brouchkov S. A. Bulat |
author_sort |
M. Yu. Cherbunina |
title |
Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
title_short |
Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
title_full |
Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
title_fullStr |
Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
title_full_unstemmed |
Microbial and Geochemical Evidence of Permafrost Formation at Mamontova Gora and Syrdakh, Central Yakutia |
title_sort |
microbial and geochemical evidence of permafrost formation at mamontova gora and syrdakh, central yakutia |
publisher |
Frontiers Media S.A. |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.739365 https://doaj.org/article/0d38a88f61ee46d5b43d2bef35d0cfe1 |
long_lat |
ENVELOPE(42.420,42.420,63.021,63.021) ENVELOPE(130.691,130.691,61.985,61.985) |
geographic |
Gora Syrdakh |
geographic_facet |
Gora Syrdakh |
genre |
Ice permafrost wedge* Yakutia |
genre_facet |
Ice permafrost wedge* Yakutia |
op_source |
Frontiers in Earth Science, Vol 9 (2021) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2021.739365/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2021.739365 https://doaj.org/article/0d38a88f61ee46d5b43d2bef35d0cfe1 |
op_doi |
https://doi.org/10.3389/feart.2021.739365 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1766027368281931776 |