Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX
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...
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2021
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Online Access: | https://doi.org/10.3389/feart.2021.704141.s001 |
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ftsmithonian:oai:figshare.com:article/15146418 |
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Open Polar |
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Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change inorganic geochemistry characteristics weathering indices thermokarst landscapes Siberia (Russia) environmental reconstruction permafrost XRF (X-ray fluorescence analysis) talik |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change inorganic geochemistry characteristics weathering indices thermokarst landscapes Siberia (Russia) environmental reconstruction permafrost XRF (X-ray fluorescence analysis) talik Mathias Ulrich (11258412) Loeka L. Jongejans (9144074) Guido Grosse (6270902) Birgit Schneider (11258415) Thomas Opel (2881034) Sebastian Wetterich (5496659) Alexander N. Fedorov (11258418) Lutz Schirrmeister (5496662) Torben Windirsch (11258421) Julia Wiedmann (11258424) Jens Strauss (5496671) Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change inorganic geochemistry characteristics weathering indices thermokarst landscapes Siberia (Russia) environmental reconstruction permafrost XRF (X-ray fluorescence analysis) talik |
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 the stratigraphy of the thawed and frozen Yedoma deposits, for which we assume a rather homogeneous chemical composition of the parent material. Our study highlights that the understanding of environmental conditions during Yedoma formation and degradation processes by specific geochemical proxies is crucial for assessing the potential decomposition and preservation of the frozen and unfrozen Yedoma inventories. |
format |
Dataset |
author |
Mathias Ulrich (11258412) Loeka L. Jongejans (9144074) Guido Grosse (6270902) Birgit Schneider (11258415) Thomas Opel (2881034) Sebastian Wetterich (5496659) Alexander N. Fedorov (11258418) Lutz Schirrmeister (5496662) Torben Windirsch (11258421) Julia Wiedmann (11258424) Jens Strauss (5496671) |
author_facet |
Mathias Ulrich (11258412) Loeka L. Jongejans (9144074) Guido Grosse (6270902) Birgit Schneider (11258415) Thomas Opel (2881034) Sebastian Wetterich (5496659) Alexander N. Fedorov (11258418) Lutz Schirrmeister (5496662) Torben Windirsch (11258421) Julia Wiedmann (11258424) Jens Strauss (5496671) |
author_sort |
Mathias Ulrich (11258412) |
title |
Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
title_short |
Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
title_full |
Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
title_fullStr |
Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
title_full_unstemmed |
Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX |
title_sort |
table1_geochemistry and weathering indices of yedoma and alas deposits beneath thermokarst lakes in central yakutia.docx |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.704141.s001 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) ENVELOPE(129.546,129.546,63.447,63.447) |
geographic |
Talik Aldan |
geographic_facet |
Talik Aldan |
genre |
Ice permafrost Thermokarst Yakutia Siberia |
genre_facet |
Ice permafrost Thermokarst Yakutia Siberia |
op_relation |
https://figshare.com/articles/dataset/Table1_Geochemistry_and_Weathering_Indices_of_Yedoma_and_Alas_Deposits_beneath_Thermokarst_Lakes_in_Central_Yakutia_DOCX/15146418 doi:10.3389/feart.2021.704141.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.704141.s001 |
_version_ |
1766027852973604864 |
spelling |
ftsmithonian:oai:figshare.com:article/15146418 2023-05-15T16:37:33+02:00 Table1_Geochemistry and Weathering Indices of Yedoma and Alas Deposits beneath Thermokarst Lakes in Central Yakutia.DOCX Mathias Ulrich (11258412) Loeka L. Jongejans (9144074) Guido Grosse (6270902) Birgit Schneider (11258415) Thomas Opel (2881034) Sebastian Wetterich (5496659) Alexander N. Fedorov (11258418) Lutz Schirrmeister (5496662) Torben Windirsch (11258421) Julia Wiedmann (11258424) Jens Strauss (5496671) 2021-08-11T04:59:19Z https://doi.org/10.3389/feart.2021.704141.s001 unknown https://figshare.com/articles/dataset/Table1_Geochemistry_and_Weathering_Indices_of_Yedoma_and_Alas_Deposits_beneath_Thermokarst_Lakes_in_Central_Yakutia_DOCX/15146418 doi:10.3389/feart.2021.704141.s001 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change inorganic geochemistry characteristics weathering indices thermokarst landscapes Siberia (Russia) environmental reconstruction permafrost XRF (X-ray fluorescence analysis) talik Dataset 2021 ftsmithonian https://doi.org/10.3389/feart.2021.704141.s001 2021-12-20T04:37:48Z 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 the stratigraphy of the thawed and frozen Yedoma deposits, for which we assume a rather homogeneous chemical composition of the parent material. Our study highlights that the understanding of environmental conditions during Yedoma formation and degradation processes by specific geochemical proxies is crucial for assessing the potential decomposition and preservation of the frozen and unfrozen Yedoma inventories. Dataset Ice permafrost Thermokarst Yakutia Siberia Unknown Talik ENVELOPE(146.601,146.601,59.667,59.667) Aldan ENVELOPE(129.546,129.546,63.447,63.447) |