Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications
Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of the cosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentary core from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The normalization applied on...
Published in: | Quaternary Science Reviews |
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Language: | French |
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2016
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Online Access: | https://semaphore.uqar.ca/id/eprint/1689/ https://semaphore.uqar.ca/id/eprint/1689/1/Quentin_Simon_et_al_avril2016.pdf https://doi.org/10.1016/j.quascirev.2016.03.027 |
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ftunivquebecar:oai:semaphore.uqar.ca:1689 2023-10-29T02:34:21+01:00 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 L. Nuttin, Laurence Hillaire-Marcel, Claude St-Onge, Guillaume 2016-05 application/pdf https://semaphore.uqar.ca/id/eprint/1689/ https://semaphore.uqar.ca/id/eprint/1689/1/Quentin_Simon_et_al_avril2016.pdf https://doi.org/10.1016/j.quascirev.2016.03.027 fr fre https://semaphore.uqar.ca/id/eprint/1689/1/Quentin_Simon_et_al_avril2016.pdf Simon, Quentin, Thouveny, Nicolas, Bourlès, Didier L., Nuttin, Laurence, Hillaire-Marcel, Claude et St-Onge, Guillaume orcid:0000-0001-6958-4217 (2016). Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications. Quaternary Science Reviews, 140 . pp. 142-162. Article Non évalué par les pairs 2016 ftunivquebecar https://doi.org/10.1016/j.quascirev.2016.03.027 2023-09-30T23:10:37Z Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of the cosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentary core from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The normalization applied on the exchangeable (authigenic) 10Be concentrations using the authigenic 9Be isotope and 230Thxs methods yield equivalent results strongly correlated with sedimentological parameters (grain-size and mineralogy). Lower authigenic beryllium (Be) concentrations and 10Be/9Be ratios are associated with coarse-grained carbonate-rich layers, while higher authigenic Be values are related to fine-grained felspar-rich sediments. This variability is due to: i) sediment composition control over beryllium-scavenging efficiency and, ii) glacial history that contributed to modify the 10Be concentration in Baffin Bay by input and boundary scavenging condition changes. Most paleo-denudation rates inferred from the 10Be/9Be ratio vary weakly around 220 ± 76 tons.km−2.yr−1 (0.09 ± 0.03 mm.yr−1) corresponding to relatively steady weathering fluxes over the last glacial cycle except for six brief intervals characterized by sharp increases of the denudation rate. These intervals are related to ice-surging episodes coeval with Heinrich events and the last deglaciation period. An average freshwater flux of 180.6 km3.yr−1 (0.006 Sv), consistent with recent models, has been calculated in order to sustain glacially-derived 10Be inputs into Baffin Bay. It is concluded that in such environments, the authigenic 10Be measured mainly depends on climatic effects related to the glacial dynamics, which masks the 10Be production variation modulated by geomagnetic field changes. Altogether, these results challenge the simple interpretation of 10Be-concentration variation as a proxy of Interglacial/Glacial (interstadial/stadial) cycles in Arctic and sub-Arctic regions. They rather suggest the effect of higher-frequency paleoclimatic changes and local ... Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin North Atlantic Université du Québec à Rimouski (UQAR): Sémaphore Quaternary Science Reviews 140 142 162 |
institution |
Open Polar |
collection |
Université du Québec à Rimouski (UQAR): Sémaphore |
op_collection_id |
ftunivquebecar |
language |
French |
description |
Authigenic 10Be/9Be ratios and 10Be-fluxes reconstructed using the 230Thxs normalization, proxies of the cosmogenic radionuclide 10Be production rate in the atmosphere, have been measured in a sedimentary core from Baffin Bay (North Atlantic) spanning the last 136 ka BP. The normalization applied on the exchangeable (authigenic) 10Be concentrations using the authigenic 9Be isotope and 230Thxs methods yield equivalent results strongly correlated with sedimentological parameters (grain-size and mineralogy). Lower authigenic beryllium (Be) concentrations and 10Be/9Be ratios are associated with coarse-grained carbonate-rich layers, while higher authigenic Be values are related to fine-grained felspar-rich sediments. This variability is due to: i) sediment composition control over beryllium-scavenging efficiency and, ii) glacial history that contributed to modify the 10Be concentration in Baffin Bay by input and boundary scavenging condition changes. Most paleo-denudation rates inferred from the 10Be/9Be ratio vary weakly around 220 ± 76 tons.km−2.yr−1 (0.09 ± 0.03 mm.yr−1) corresponding to relatively steady weathering fluxes over the last glacial cycle except for six brief intervals characterized by sharp increases of the denudation rate. These intervals are related to ice-surging episodes coeval with Heinrich events and the last deglaciation period. An average freshwater flux of 180.6 km3.yr−1 (0.006 Sv), consistent with recent models, has been calculated in order to sustain glacially-derived 10Be inputs into Baffin Bay. It is concluded that in such environments, the authigenic 10Be measured mainly depends on climatic effects related to the glacial dynamics, which masks the 10Be production variation modulated by geomagnetic field changes. Altogether, these results challenge the simple interpretation of 10Be-concentration variation as a proxy of Interglacial/Glacial (interstadial/stadial) cycles in Arctic and sub-Arctic regions. They rather suggest the effect of higher-frequency paleoclimatic changes and local ... |
format |
Article in Journal/Newspaper |
author |
Simon, Quentin Thouveny, Nicolas Bourlès, Didier L. Nuttin, Laurence Hillaire-Marcel, Claude St-Onge, Guillaume |
spellingShingle |
Simon, Quentin Thouveny, Nicolas Bourlès, Didier L. Nuttin, Laurence Hillaire-Marcel, Claude St-Onge, Guillaume Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications |
author_facet |
Simon, Quentin Thouveny, Nicolas Bourlès, Didier L. Nuttin, Laurence Hillaire-Marcel, Claude St-Onge, Guillaume |
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 |
publishDate |
2016 |
url |
https://semaphore.uqar.ca/id/eprint/1689/ https://semaphore.uqar.ca/id/eprint/1689/1/Quentin_Simon_et_al_avril2016.pdf https://doi.org/10.1016/j.quascirev.2016.03.027 |
genre |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin North Atlantic |
op_relation |
https://semaphore.uqar.ca/id/eprint/1689/1/Quentin_Simon_et_al_avril2016.pdf Simon, Quentin, Thouveny, Nicolas, Bourlès, Didier L., Nuttin, Laurence, Hillaire-Marcel, Claude et St-Onge, Guillaume orcid:0000-0001-6958-4217 (2016). Authigenic 10Be/9Be ratios and 10Be-fluxes (230Thxs-normalized) in central Baffin Bay sediments during the last glacial cycle: Paleoenvironmental implications. Quaternary Science Reviews, 140 . pp. 142-162. |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.03.027 |
container_title |
Quaternary Science Reviews |
container_volume |
140 |
container_start_page |
142 |
op_container_end_page |
162 |
_version_ |
1781056874630610944 |