Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes
We present a detailed analysis of weathering fluxes at Lake Baikal, the largest lake in the world, using the major element, trace element and isotope geochemistry of major inflowing rivers, the lake itself, and its sediments. Our objective is to assess how lake records could be used to understand ri...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/533345 2023-05-15T17:58:22+02:00 Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes Suhrhoff, Tim Jesper Rickli, Jörg Christl, Marcus Vologina, Elena G. Pham, Viet Belhadj, Moustafa Sklyarov, Eugene V. Jeandel, Catherine Vance, Derek 2022-03-15 application/application/pdf https://hdl.handle.net/20.500.11850/533345 https://doi.org/10.3929/ethz-b-000533345 en eng Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2022.01.007 info:eu-repo/semantics/altIdentifier/wos/000783485400008 info:eu-repo/grantAgreement/ETHZ/ETH Grants/ETH-01 17-1 http://hdl.handle.net/20.500.11850/533345 doi:10.3929/ethz-b-000533345 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Geochimica et Cosmochimica Acta, 321 Lake Baikal Weathering Erosion Denudation Meteoric beryllium Radiogenic isotopes REE info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftethz https://doi.org/20.500.11850/533345 https://doi.org/10.3929/ethz-b-000533345 https://doi.org/10.1016/j.gca.2022.01.007 2023-02-13T01:05:51Z We present a detailed analysis of weathering fluxes at Lake Baikal, the largest lake in the world, using the major element, trace element and isotope geochemistry of major inflowing rivers, the lake itself, and its sediments. Our objective is to assess how lake records could be used to understand river-catchment-scale denudation and weathering processes. Total denudation rates at Lake Baikal, as obtained from meteoric 10Be/9Be, are an order of magnitude lower than the global average, at 16–35 t km−2 yr−1. Chemical weathering rates obtained from the riverine dissolved load and discharge are, on the other hand, in the same range as global values, at 6–29 t km−2 yr−1. Chemical weathering rates are higher in the north of the catchment than in the south, consistent with higher runoff in the north. In contrast, 10Be/9Be-derived denudation rates are higher in the south. We hypothesize that this pattern of variation may be due to the stabilizing effect of permafrost soils preventing erosion in the north. An inverse model shows that the Selenga River, Lake Baikal's major tributary, has a silicate weathering contribution to riverine dissolved cation fluxes of 42 mol%; this and other characteristics are representative of large rivers globally. Many trace elements have much lower concentrations in the lake than in inflowing rivers (Be (5%), Mn (3%), Fe (0.4%) and REE (1–2%)). We suggest, based on REE patterns and Mn, Fe-depth profiles in the lake, that this removal is the result of pH induced changes in dissolved-adsorbed partitioning at the river-lake interface, and the incorporation of trace elements into authigenic Fe-Mn (oxyhydr)oxide phases forming within the lake. Strontium is isotopically uniform within the lake, demonstrating that the whole lake mixes on a timescale shorter than its residence time (<330 years). Neodymium and Be, in contrast, show isotopic variability between the basins. While the Sr isotope budget of the lake is largely consistent with observed riverine Sr fluxes, an unradiogenic Nd source is ... Article in Journal/Newspaper permafrost ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Lake Baikal Weathering Erosion Denudation Meteoric beryllium Radiogenic isotopes REE |
spellingShingle |
Lake Baikal Weathering Erosion Denudation Meteoric beryllium Radiogenic isotopes REE Suhrhoff, Tim Jesper Rickli, Jörg Christl, Marcus Vologina, Elena G. Pham, Viet Belhadj, Moustafa Sklyarov, Eugene V. Jeandel, Catherine Vance, Derek Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
topic_facet |
Lake Baikal Weathering Erosion Denudation Meteoric beryllium Radiogenic isotopes REE |
description |
We present a detailed analysis of weathering fluxes at Lake Baikal, the largest lake in the world, using the major element, trace element and isotope geochemistry of major inflowing rivers, the lake itself, and its sediments. Our objective is to assess how lake records could be used to understand river-catchment-scale denudation and weathering processes. Total denudation rates at Lake Baikal, as obtained from meteoric 10Be/9Be, are an order of magnitude lower than the global average, at 16–35 t km−2 yr−1. Chemical weathering rates obtained from the riverine dissolved load and discharge are, on the other hand, in the same range as global values, at 6–29 t km−2 yr−1. Chemical weathering rates are higher in the north of the catchment than in the south, consistent with higher runoff in the north. In contrast, 10Be/9Be-derived denudation rates are higher in the south. We hypothesize that this pattern of variation may be due to the stabilizing effect of permafrost soils preventing erosion in the north. An inverse model shows that the Selenga River, Lake Baikal's major tributary, has a silicate weathering contribution to riverine dissolved cation fluxes of 42 mol%; this and other characteristics are representative of large rivers globally. Many trace elements have much lower concentrations in the lake than in inflowing rivers (Be (5%), Mn (3%), Fe (0.4%) and REE (1–2%)). We suggest, based on REE patterns and Mn, Fe-depth profiles in the lake, that this removal is the result of pH induced changes in dissolved-adsorbed partitioning at the river-lake interface, and the incorporation of trace elements into authigenic Fe-Mn (oxyhydr)oxide phases forming within the lake. Strontium is isotopically uniform within the lake, demonstrating that the whole lake mixes on a timescale shorter than its residence time (<330 years). Neodymium and Be, in contrast, show isotopic variability between the basins. While the Sr isotope budget of the lake is largely consistent with observed riverine Sr fluxes, an unradiogenic Nd source is ... |
format |
Article in Journal/Newspaper |
author |
Suhrhoff, Tim Jesper Rickli, Jörg Christl, Marcus Vologina, Elena G. Pham, Viet Belhadj, Moustafa Sklyarov, Eugene V. Jeandel, Catherine Vance, Derek |
author_facet |
Suhrhoff, Tim Jesper Rickli, Jörg Christl, Marcus Vologina, Elena G. Pham, Viet Belhadj, Moustafa Sklyarov, Eugene V. Jeandel, Catherine Vance, Derek |
author_sort |
Suhrhoff, Tim Jesper |
title |
Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
title_short |
Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
title_full |
Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
title_fullStr |
Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
title_full_unstemmed |
Source to sink analysis of weathering fluxes in Lake Baikal and its watershed based on riverine fluxes, elemental lake budgets, REE patterns, and radiogenic (Nd, Sr) and 10Be/9Be isotopes |
title_sort |
source to sink analysis of weathering fluxes in lake baikal and its watershed based on riverine fluxes, elemental lake budgets, ree patterns, and radiogenic (nd, sr) and 10be/9be isotopes |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11850/533345 https://doi.org/10.3929/ethz-b-000533345 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Geochimica et Cosmochimica Acta, 321 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2022.01.007 info:eu-repo/semantics/altIdentifier/wos/000783485400008 info:eu-repo/grantAgreement/ETHZ/ETH Grants/ETH-01 17-1 http://hdl.handle.net/20.500.11850/533345 doi:10.3929/ethz-b-000533345 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/533345 https://doi.org/10.3929/ethz-b-000533345 https://doi.org/10.1016/j.gca.2022.01.007 |
_version_ |
1766166966351953920 |