Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications
International audience Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of thecosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentarycore from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The nor...
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ftcollegfrance:oai:HAL:hal-01456980v1 2024-06-23T07:50:45+00:00 Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications Simon, Quentin Thouveny, Nicolas Bourlès, Didier Nuttin, Laurence Hillaire-Marcel, Claude Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre de recherche en géochimie et géodynamique (GEOTOP ) Université du Québec à Montréal = University of Québec in Montréal (UQAM) 2016-04-05 https://hal.science/hal-01456980 https://hal.science/hal-01456980/document https://hal.science/hal-01456980/file/SIMONetal2016-QSR-BAFFIN-version-auteur.pdf https://doi.org/10.1016/j.quascirev.2016.03.0270277-3791 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2016.03.0270277-3791 hal-01456980 https://hal.science/hal-01456980 https://hal.science/hal-01456980/document https://hal.science/hal-01456980/file/SIMONetal2016-QSR-BAFFIN-version-auteur.pdf doi:10.1016/j.quascirev.2016.03.0270277-3791 info:eu-repo/semantics/OpenAccess ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-01456980 Quaternary Science Reviews, 2016, ⟨10.1016/j.quascirev.2016.03.0270277-3791⟩ [SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2016 ftcollegfrance https://doi.org/10.1016/j.quascirev.2016.03.0270277-3791 2024-06-13T23:41:08Z International audience Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of thecosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentarycore from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The normalization applied on theexchangeable (authigenic) 10Be concentrations using the authigenic 9Be isotope and 230Thxs methodsyield equivalent results strongly correlated with sedimentological parameters (grain-size and mineralogy).Lower authigenic beryllium (Be) concentrations and 10Be/9Be ratios are associated with coarsegrainedcarbonate-rich layers, while higher authigenic Be values are related to fine-grained felsparrichsediments. This variability is due to: i) sediment composition control over beryllium-scavengingefficiency and, ii) glacial history that contributed to modify the 10Be concentration in Baffin Bay byinput and boundary scavenging condition changes. Most paleo-denudation rates inferred from the10Be/9Be ratio vary weakly around 220 ± 76 tons.km2.yr1 (0.09 ± 0.03 mm.yr1) corresponding torelatively steady weathering fluxes over the last glacial cycle except for six brief intervals characterizedby sharp increases of the denudation rate. These intervals are related to ice-surging episodes coeval withHeinrich events and the last deglaciation period. An average freshwater flux of 180.6 km3.yr1 (0.006 Sv),consistent with recent models, has been calculated in order to sustain glacially-derived 10Be inputs intoBaffin Bay. It is concluded that in such environments, the authigenic 10Be measured mainly depends onclimatic effects related to the glacial dynamics, which masks the 10Be production variation modulated bygeomagnetic field changes. Altogether, these results challenge the simple interpretation of 10Be-concentrationvariation as a proxy of Interglacial/Glacial (interstadial/stadial) cycles in Arctic and sub-Arcticregions. They rather suggest the effect of higher-frequency paleoclimatic changes and local ... Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin North Atlantic Collège de France: HAL Arctic Baffin Bay |
institution |
Open Polar |
collection |
Collège de France: HAL |
op_collection_id |
ftcollegfrance |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
spellingShingle |
[SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences Simon, Quentin Thouveny, Nicolas Bourlès, Didier Nuttin, Laurence Hillaire-Marcel, Claude Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
topic_facet |
[SDU]Sciences of the Universe [physics] [SDE]Environmental Sciences |
description |
International audience Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of thecosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentarycore from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The normalization applied on theexchangeable (authigenic) 10Be concentrations using the authigenic 9Be isotope and 230Thxs methodsyield equivalent results strongly correlated with sedimentological parameters (grain-size and mineralogy).Lower authigenic beryllium (Be) concentrations and 10Be/9Be ratios are associated with coarsegrainedcarbonate-rich layers, while higher authigenic Be values are related to fine-grained felsparrichsediments. This variability is due to: i) sediment composition control over beryllium-scavengingefficiency and, ii) glacial history that contributed to modify the 10Be concentration in Baffin Bay byinput and boundary scavenging condition changes. Most paleo-denudation rates inferred from the10Be/9Be ratio vary weakly around 220 ± 76 tons.km2.yr1 (0.09 ± 0.03 mm.yr1) corresponding torelatively steady weathering fluxes over the last glacial cycle except for six brief intervals characterizedby sharp increases of the denudation rate. These intervals are related to ice-surging episodes coeval withHeinrich events and the last deglaciation period. An average freshwater flux of 180.6 km3.yr1 (0.006 Sv),consistent with recent models, has been calculated in order to sustain glacially-derived 10Be inputs intoBaffin Bay. It is concluded that in such environments, the authigenic 10Be measured mainly depends onclimatic effects related to the glacial dynamics, which masks the 10Be production variation modulated bygeomagnetic field changes. Altogether, these results challenge the simple interpretation of 10Be-concentrationvariation as a proxy of Interglacial/Glacial (interstadial/stadial) cycles in Arctic and sub-Arcticregions. They rather suggest the effect of higher-frequency paleoclimatic changes and local ... |
author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Centre de recherche en géochimie et géodynamique (GEOTOP ) Université du Québec à Montréal = University of Québec in Montréal (UQAM) |
format |
Article in Journal/Newspaper |
author |
Simon, Quentin Thouveny, Nicolas Bourlès, Didier Nuttin, Laurence Hillaire-Marcel, Claude |
author_facet |
Simon, Quentin Thouveny, Nicolas Bourlès, Didier Nuttin, Laurence Hillaire-Marcel, Claude |
author_sort |
Simon, Quentin |
title |
Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
title_short |
Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
title_full |
Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
title_fullStr |
Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
title_full_unstemmed |
Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
title_sort |
authigenic 10be/9be ratios and 10be-fluxes (230thxs-normalized) in central baffin bay sediments during the last glacial cycle: paleoenvironmental implications |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01456980 https://hal.science/hal-01456980/document https://hal.science/hal-01456980/file/SIMONetal2016-QSR-BAFFIN-version-auteur.pdf https://doi.org/10.1016/j.quascirev.2016.03.0270277-3791 |
geographic |
Arctic Baffin Bay |
geographic_facet |
Arctic Baffin Bay |
genre |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
op_source |
ISSN: 0277-3791 EISSN: 1873-457X Quaternary Science Reviews https://hal.science/hal-01456980 Quaternary Science Reviews, 2016, ⟨10.1016/j.quascirev.2016.03.0270277-3791⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.quascirev.2016.03.0270277-3791 hal-01456980 https://hal.science/hal-01456980 https://hal.science/hal-01456980/document https://hal.science/hal-01456980/file/SIMONetal2016-QSR-BAFFIN-version-auteur.pdf doi:10.1016/j.quascirev.2016.03.0270277-3791 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.03.0270277-3791 |
_version_ |
1802641663971033088 |