Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia
Ice- and organic-rich deposits of late Pleistocene age, known as Yedoma Ice Complex (IC), are widespread across large permafrost regions in Northeast Siberia. To reconstruct Yedoma IC formation in Central Yakutia, we analyzed the geochemistry, sedimentology, and stratigraphy of thawed and frozen dep...
Published in: | Frontiers in Earth Science |
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Frontiers Research Foundation
2021
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Online Access: | https://epic.awi.de/id/eprint/54460/ https://epic.awi.de/id/eprint/54460/1/feart-09-704141.pdf https://doi.org/10.3389/feart.2021.704141 https://hdl.handle.net/10013/epic.494c1c22-b1c1-4054-b657-08e6ace7e16c |
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ftawi:oai:epic.awi.de:54460 2024-03-24T09:02:32+00:00 Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia Ulrich, Mathias Jongejans, Loeka L Grosse, Guido Schneider, Birgit Opel, Thomas Wetterich, Sebastian Fedorov, Alexander N Schirrmeister, Lutz Windirsch, Torben Wiedmann, Julia Strauss, Jens 2021 application/pdf https://epic.awi.de/id/eprint/54460/ https://epic.awi.de/id/eprint/54460/1/feart-09-704141.pdf https://doi.org/10.3389/feart.2021.704141 https://hdl.handle.net/10013/epic.494c1c22-b1c1-4054-b657-08e6ace7e16c unknown Frontiers Research Foundation https://epic.awi.de/id/eprint/54460/1/feart-09-704141.pdf Ulrich, M. , Jongejans, L. L. orcid:0000-0002-0383-4567 , Grosse, G. orcid:0000-0001-5895-2141 , Schneider, B. , Opel, T. orcid:0000-0003-1315-8256 , Wetterich, S. orcid:0000-0001-9234-1192 , Fedorov, A. N. , Schirrmeister, L. orcid:0000-0001-9455-0596 , Windirsch, T. orcid:0000-0002-4292-6931 , Wiedmann, J. and Strauss, J. orcid:0000-0003-4678-4982 (2021) Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia , Frontiers in Earth Science, 9 . doi:10.3389/feart.2021.704141 <https://doi.org/10.3389/feart.2021.704141> , hdl:10013/epic.494c1c22-b1c1-4054-b657-08e6ace7e16c info:eu-repo/semantics/openAccess EPIC3Frontiers in Earth Science, Frontiers Research Foundation, 9, ISSN: 2296-6463 Article isiRev info:eu-repo/semantics/article 2021 ftawi https://doi.org/10.3389/feart.2021.704141 2024-02-27T09:55:26Z Ice- and organic-rich deposits of late Pleistocene age, known as Yedoma Ice Complex (IC), are widespread across large permafrost regions in Northeast Siberia. To reconstruct Yedoma IC formation in Central Yakutia, we analyzed the geochemistry, sedimentology, and stratigraphy of thawed and frozen deposits below two thermokarst lakes in different evolutionary stages (a mature alas lake and a initial Yedoma lake) from the Yukechi site in the Lena-Aldan interfluve. We focused on inorganic geochemical characteristics and mineral weathering in two ∼17 m long sediment cores to trace syngenetic permafrost aggradation and degradation over time. Geochemical properties, element ratios, and specific weathering indices reflect varying sedimentation processes and seasonal thaw depths under variable environmental conditions. Deeper thaw during the interstadial Marine Isotope Stage (MIS) 3 enabled increasing mineral weathering and initial thermokarst processes. Sedimentological proxies reflect high transport energy and short transport paths and mainly terrestrial sediment supply. The Yedoma formation resulted from fluvial, alluvial and aeolian processes. Low mean TOC contents in both cores contrast with Yedoma deposits elsewhere. Likely, this is a result of the very low organic matter content of the source material of the Yukechi Yedoma. Pronounced cryostructures and strongly depleted pore water stable isotopes show a perennially frozen state and preserved organic matter for the lower part of the Yedoma lake core, while changing permafrost conditions, conditions promoting weathering, and strong organic matter decomposition are suggested by our proxies for its middle and upper parts. For the alas lake core, less depleted water stable isotopes reflect the influence of recent precipitation, i.e. the infiltration of rain and lake water into the unfrozen ground. The FENG, MIA(R), and ICV weathering indices have proven to be promising proxies for the identification of conditions that promote mineral weathering to different degrees in ... Article in Journal/Newspaper Ice permafrost Thermokarst Yakutia Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Aldan ENVELOPE(129.546,129.546,63.447,63.447) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Ice- and organic-rich deposits of late Pleistocene age, known as Yedoma Ice Complex (IC), are widespread across large permafrost regions in Northeast Siberia. To reconstruct Yedoma IC formation in Central Yakutia, we analyzed the geochemistry, sedimentology, and stratigraphy of thawed and frozen deposits below two thermokarst lakes in different evolutionary stages (a mature alas lake and a initial Yedoma lake) from the Yukechi site in the Lena-Aldan interfluve. We focused on inorganic geochemical characteristics and mineral weathering in two ∼17 m long sediment cores to trace syngenetic permafrost aggradation and degradation over time. Geochemical properties, element ratios, and specific weathering indices reflect varying sedimentation processes and seasonal thaw depths under variable environmental conditions. Deeper thaw during the interstadial Marine Isotope Stage (MIS) 3 enabled increasing mineral weathering and initial thermokarst processes. Sedimentological proxies reflect high transport energy and short transport paths and mainly terrestrial sediment supply. The Yedoma formation resulted from fluvial, alluvial and aeolian processes. Low mean TOC contents in both cores contrast with Yedoma deposits elsewhere. Likely, this is a result of the very low organic matter content of the source material of the Yukechi Yedoma. Pronounced cryostructures and strongly depleted pore water stable isotopes show a perennially frozen state and preserved organic matter for the lower part of the Yedoma lake core, while changing permafrost conditions, conditions promoting weathering, and strong organic matter decomposition are suggested by our proxies for its middle and upper parts. For the alas lake core, less depleted water stable isotopes reflect the influence of recent precipitation, i.e. the infiltration of rain and lake water into the unfrozen ground. The FENG, MIA(R), and ICV weathering indices have proven to be promising proxies for the identification of conditions that promote mineral weathering to different degrees in ... |
format |
Article in Journal/Newspaper |
author |
Ulrich, Mathias Jongejans, Loeka L Grosse, Guido Schneider, Birgit Opel, Thomas Wetterich, Sebastian Fedorov, Alexander N Schirrmeister, Lutz Windirsch, Torben Wiedmann, Julia Strauss, Jens |
spellingShingle |
Ulrich, Mathias Jongejans, Loeka L Grosse, Guido Schneider, Birgit Opel, Thomas Wetterich, Sebastian Fedorov, Alexander N Schirrmeister, Lutz Windirsch, Torben Wiedmann, Julia Strauss, Jens Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
author_facet |
Ulrich, Mathias Jongejans, Loeka L Grosse, Guido Schneider, Birgit Opel, Thomas Wetterich, Sebastian Fedorov, Alexander N Schirrmeister, Lutz Windirsch, Torben Wiedmann, Julia Strauss, Jens |
author_sort |
Ulrich, Mathias |
title |
Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
title_short |
Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
title_full |
Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
title_fullStr |
Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
title_full_unstemmed |
Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia |
title_sort |
geochemistry and weathering indices of yedoma and alas deposits beneath thermokarst lakes in central yakutia |
publisher |
Frontiers Research Foundation |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/54460/ https://epic.awi.de/id/eprint/54460/1/feart-09-704141.pdf https://doi.org/10.3389/feart.2021.704141 https://hdl.handle.net/10013/epic.494c1c22-b1c1-4054-b657-08e6ace7e16c |
long_lat |
ENVELOPE(129.546,129.546,63.447,63.447) |
geographic |
Aldan |
geographic_facet |
Aldan |
genre |
Ice permafrost Thermokarst Yakutia Siberia |
genre_facet |
Ice permafrost Thermokarst Yakutia Siberia |
op_source |
EPIC3Frontiers in Earth Science, Frontiers Research Foundation, 9, ISSN: 2296-6463 |
op_relation |
https://epic.awi.de/id/eprint/54460/1/feart-09-704141.pdf Ulrich, M. , Jongejans, L. L. orcid:0000-0002-0383-4567 , Grosse, G. orcid:0000-0001-5895-2141 , Schneider, B. , Opel, T. orcid:0000-0003-1315-8256 , Wetterich, S. orcid:0000-0001-9234-1192 , Fedorov, A. N. , Schirrmeister, L. orcid:0000-0001-9455-0596 , Windirsch, T. orcid:0000-0002-4292-6931 , Wiedmann, J. and Strauss, J. orcid:0000-0003-4678-4982 (2021) Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia , Frontiers in Earth Science, 9 . doi:10.3389/feart.2021.704141 <https://doi.org/10.3389/feart.2021.704141> , hdl:10013/epic.494c1c22-b1c1-4054-b657-08e6ace7e16c |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2021.704141 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
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1794402871797612544 |