Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation

International audience This study is aimed at assessing the effect of factors including lithology, forest/peatland coverage, dissolved organic carbon, and vegetation on chemical fluxes and concentrations of major elements in rivers. The mean annual element concentrations and dissolved fluxes of acid...

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Published in:Chemical Geology
Main Authors: Zakharova, E.A., Pokrovsky, O.S., Dupré, B., Gaillardet, J., Efimova, L.E.
Other Authors: Laboratoire des Mécanismes et Transfert en Géologie (LMTG), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS), Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2007
Subjects:
Online Access:https://hal.science/hal-00357062
https://doi.org/10.1016/j.chemgeo.2007.03.018
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spelling ftunivparis:oai:HAL:hal-00357062v1 2024-09-09T19:49:44+00:00 Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation Zakharova, E.A. Pokrovsky, O.S. Dupré, B. Gaillardet, J. Efimova, L.E. Laboratoire des Mécanismes et Transfert en Géologie (LMTG) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2007 https://hal.science/hal-00357062 https://doi.org/10.1016/j.chemgeo.2007.03.018 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2007.03.018 hal-00357062 https://hal.science/hal-00357062 doi:10.1016/j.chemgeo.2007.03.018 ISSN: 0009-2541 Chemical Geology https://hal.science/hal-00357062 Chemical Geology, 2007, 242, pp.255-277. ⟨10.1016/j.chemgeo.2007.03.018⟩ Chemical weathering River water Granite Vegetation [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology info:eu-repo/semantics/article Journal articles 2007 ftunivparis https://doi.org/10.1016/j.chemgeo.2007.03.018 2024-06-20T23:40:51Z International audience This study is aimed at assessing the effect of factors including lithology, forest/peatland coverage, dissolved organic carbon, and vegetation on chemical fluxes and concentrations of major elements in rivers. The mean annual element concentrations and dissolved fluxes of acid and basic rock dominated watersheds of the Karelia region and Kola peninsula, NW Russia, have been estimated from the chemical composition of river water samples collected in the summers of 1996–2000 and from annual discharge and chemical composition data of 16 watersheds collected from 1961 to 1975. The mean annual flux corrected for atmospheric input varies from 0.5 to 5.6 t/km2/y and is dominated by alkali metals for the Kola alkaline rocks and by calcium for the Karelian granito-gneisses. The pure “granitic” and pure “basaltic” river chemical denudation rates in the Baltic shield are 0.33 and 2.3 t/km2/y, respectively. The cationic and silica fluxes of both granitic and basaltic watersheds are comparable with those of other boreal regions having similar runoff, compositions, and climate. The cationic flux of the rivers is positively correlated with the basic rock fraction of the watershed, whereas the dissolved organic carbon flux increases with the increasing peatland fraction. The chemical composition of the river water is controlled by bedrock dissolution during dry periods, and by plant litter degradation and washout of organic debris from the topsoil horizon during wet periods. Taking account the chemical composition of the plant litter and the biological turnover intensity, it was estimated that the plant litter degradation in Kola and Karelia regions provides 10–40% of total annual dissolved riverine element flux. Article in Journal/Newspaper karelia* karelian kola peninsula Université de Paris: Portail HAL Granito ENVELOPE(-60.783,-60.783,-62.450,-62.450) Kola Peninsula Chemical Geology 242 1-2 255 277
institution Open Polar
collection Université de Paris: Portail HAL
op_collection_id ftunivparis
language English
topic Chemical weathering
River water
Granite
Vegetation
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology
spellingShingle Chemical weathering
River water
Granite
Vegetation
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology
Zakharova, E.A.
Pokrovsky, O.S.
Dupré, B.
Gaillardet, J.
Efimova, L.E.
Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
topic_facet Chemical weathering
River water
Granite
Vegetation
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology
description International audience This study is aimed at assessing the effect of factors including lithology, forest/peatland coverage, dissolved organic carbon, and vegetation on chemical fluxes and concentrations of major elements in rivers. The mean annual element concentrations and dissolved fluxes of acid and basic rock dominated watersheds of the Karelia region and Kola peninsula, NW Russia, have been estimated from the chemical composition of river water samples collected in the summers of 1996–2000 and from annual discharge and chemical composition data of 16 watersheds collected from 1961 to 1975. The mean annual flux corrected for atmospheric input varies from 0.5 to 5.6 t/km2/y and is dominated by alkali metals for the Kola alkaline rocks and by calcium for the Karelian granito-gneisses. The pure “granitic” and pure “basaltic” river chemical denudation rates in the Baltic shield are 0.33 and 2.3 t/km2/y, respectively. The cationic and silica fluxes of both granitic and basaltic watersheds are comparable with those of other boreal regions having similar runoff, compositions, and climate. The cationic flux of the rivers is positively correlated with the basic rock fraction of the watershed, whereas the dissolved organic carbon flux increases with the increasing peatland fraction. The chemical composition of the river water is controlled by bedrock dissolution during dry periods, and by plant litter degradation and washout of organic debris from the topsoil horizon during wet periods. Taking account the chemical composition of the plant litter and the biological turnover intensity, it was estimated that the plant litter degradation in Kola and Karelia regions provides 10–40% of total annual dissolved riverine element flux.
author2 Laboratoire des Mécanismes et Transfert en Géologie (LMTG)
Université Toulouse III - Paul Sabatier (UT3)
Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP)
Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3)
Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)
Institut de Physique du Globe de Paris (IPGP)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)
format Article in Journal/Newspaper
author Zakharova, E.A.
Pokrovsky, O.S.
Dupré, B.
Gaillardet, J.
Efimova, L.E.
author_facet Zakharova, E.A.
Pokrovsky, O.S.
Dupré, B.
Gaillardet, J.
Efimova, L.E.
author_sort Zakharova, E.A.
title Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
title_short Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
title_full Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
title_fullStr Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
title_full_unstemmed Chemical weathering of silicate rocks in Karelia region and Kola peninsula, NW Russia: Assessing the effect of rock composition, wetlands and vegetation
title_sort chemical weathering of silicate rocks in karelia region and kola peninsula, nw russia: assessing the effect of rock composition, wetlands and vegetation
publisher HAL CCSD
publishDate 2007
url https://hal.science/hal-00357062
https://doi.org/10.1016/j.chemgeo.2007.03.018
long_lat ENVELOPE(-60.783,-60.783,-62.450,-62.450)
geographic Granito
Kola Peninsula
geographic_facet Granito
Kola Peninsula
genre karelia*
karelian
kola peninsula
genre_facet karelia*
karelian
kola peninsula
op_source ISSN: 0009-2541
Chemical Geology
https://hal.science/hal-00357062
Chemical Geology, 2007, 242, pp.255-277. ⟨10.1016/j.chemgeo.2007.03.018⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2007.03.018
hal-00357062
https://hal.science/hal-00357062
doi:10.1016/j.chemgeo.2007.03.018
op_doi https://doi.org/10.1016/j.chemgeo.2007.03.018
container_title Chemical Geology
container_volume 242
container_issue 1-2
container_start_page 255
op_container_end_page 277
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