A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th
International audience Merging the late Quaternary Arctic paleoceanography into the Earth's global climate history remains challenging due to the lack of robust marine chronostratigraphies. Over ridges notably, low and variable sedimentation rates, scarce biogenic remains ensuing from low produ...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hal.science/hal-03226680 https://hal.science/hal-03226680/document https://hal.science/hal-03226680/file/2017GC007050.pdf https://doi.org/10.1002/2017GC007050 |
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ftuniparissaclay:oai:HAL:hal-03226680v1 2024-09-30T14:30:15+00:00 A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th Hillaire-Marcel, C. Ghaleb, B. de Vernal, A. Maccali, J. Cuny, K. Jacobel, A. Le Duc, C. Mcmanus, J. Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York 2017 https://hal.science/hal-03226680 https://hal.science/hal-03226680/document https://hal.science/hal-03226680/file/2017GC007050.pdf https://doi.org/10.1002/2017GC007050 en eng HAL CCSD AGU and the Geochemical Society info:eu-repo/semantics/altIdentifier/doi/10.1002/2017GC007050 hal-03226680 https://hal.science/hal-03226680 https://hal.science/hal-03226680/document https://hal.science/hal-03226680/file/2017GC007050.pdf doi:10.1002/2017GC007050 info:eu-repo/semantics/OpenAccess EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03226680 Geochemistry, Geophysics, Geosystems, 2017, 18 (12), pp.4573-4585. ⟨10.1002/2017GC007050⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2017 ftuniparissaclay https://doi.org/10.1002/2017GC007050 2024-09-06T00:30:30Z International audience Merging the late Quaternary Arctic paleoceanography into the Earth's global climate history remains challenging due to the lack of robust marine chronostratigraphies. Over ridges notably, low and variable sedimentation rates, scarce biogenic remains ensuing from low productivity and/or poor preservation, and oxygen isotope and paleomagnetic records differing from global stacks represent major impediments. However, as illustrate here based on consistent records from Mendeleev‐Alpha and Lomonosov Ridges, disequilibria between U‐series isotopes can provide benchmark ages. In such settings, fluxes of the particle‐reactive U‐daughter isotopes 230Th and 231Pa from the water column, are not unequivocally linked to sedimentation rates, but rather to sea‐ice rafting and brine production histories, thus to the development of sea‐ice factories over shelves during intervals of high relative sea level. The excesses in 230Th and 231Pa over fractions supported by their parent U‐isotopes, collapse down sedimentary sequences, due to radioactive decay, and provide radiometric benchmark ages of approximately 300 and 140 ka, respectively. These “extinction ages” point to mean sedimentation rates of ∼4.3 and ∼1.7 mm/ka, respectively, over the Lomonosov and Mendeleev Ridges, which are significantly lower than assumed in most recent studies, thus highlighting the need for revisiting current interpretations of Arctic lithostratigraphies in relation to the global‐scale late Quaternary climatostratigraphy. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Archives ouvertes de Paris-Saclay Arctic Arctic Ocean Geochemistry, Geophysics, Geosystems 18 12 4573 4585 |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Hillaire-Marcel, C. Ghaleb, B. de Vernal, A. Maccali, J. Cuny, K. Jacobel, A. Le Duc, C. Mcmanus, J. A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Merging the late Quaternary Arctic paleoceanography into the Earth's global climate history remains challenging due to the lack of robust marine chronostratigraphies. Over ridges notably, low and variable sedimentation rates, scarce biogenic remains ensuing from low productivity and/or poor preservation, and oxygen isotope and paleomagnetic records differing from global stacks represent major impediments. However, as illustrate here based on consistent records from Mendeleev‐Alpha and Lomonosov Ridges, disequilibria between U‐series isotopes can provide benchmark ages. In such settings, fluxes of the particle‐reactive U‐daughter isotopes 230Th and 231Pa from the water column, are not unequivocally linked to sedimentation rates, but rather to sea‐ice rafting and brine production histories, thus to the development of sea‐ice factories over shelves during intervals of high relative sea level. The excesses in 230Th and 231Pa over fractions supported by their parent U‐isotopes, collapse down sedimentary sequences, due to radioactive decay, and provide radiometric benchmark ages of approximately 300 and 140 ka, respectively. These “extinction ages” point to mean sedimentation rates of ∼4.3 and ∼1.7 mm/ka, respectively, over the Lomonosov and Mendeleev Ridges, which are significantly lower than assumed in most recent studies, thus highlighting the need for revisiting current interpretations of Arctic lithostratigraphies in relation to the global‐scale late Quaternary climatostratigraphy. |
author2 |
Centre de recherche sur la dynamique du système Terre (GEOTOP) École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Lamont-Doherty Earth Observatory (LDEO) Columbia University New York |
format |
Article in Journal/Newspaper |
author |
Hillaire-Marcel, C. Ghaleb, B. de Vernal, A. Maccali, J. Cuny, K. Jacobel, A. Le Duc, C. Mcmanus, J. |
author_facet |
Hillaire-Marcel, C. Ghaleb, B. de Vernal, A. Maccali, J. Cuny, K. Jacobel, A. Le Duc, C. Mcmanus, J. |
author_sort |
Hillaire-Marcel, C. |
title |
A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
title_short |
A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
title_full |
A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
title_fullStr |
A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
title_full_unstemmed |
A New Chronology of Late Quaternary Sequences From the Central Arctic Ocean Based on “Extinction Ages” of Their Excesses in 231 Pa and 230 Th |
title_sort |
new chronology of late quaternary sequences from the central arctic ocean based on “extinction ages” of their excesses in 231 pa and 230 th |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-03226680 https://hal.science/hal-03226680/document https://hal.science/hal-03226680/file/2017GC007050.pdf https://doi.org/10.1002/2017GC007050 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
EISSN: 1525-2027 Geochemistry, Geophysics, Geosystems https://hal.science/hal-03226680 Geochemistry, Geophysics, Geosystems, 2017, 18 (12), pp.4573-4585. ⟨10.1002/2017GC007050⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2017GC007050 hal-03226680 https://hal.science/hal-03226680 https://hal.science/hal-03226680/document https://hal.science/hal-03226680/file/2017GC007050.pdf doi:10.1002/2017GC007050 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2017GC007050 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
18 |
container_issue |
12 |
container_start_page |
4573 |
op_container_end_page |
4585 |
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1811635266579857408 |