Toward a radiometric ice clock: uranium ages of the Dome C ice core
Ice sheets and deep ice cores have yielded a wealth of paleoclimate information based on continuous dating methods while independent radiometric ages of ice have remained elusive. Here we demonstrate the application of (234U/238U) measurements to dating the EPICA Dome C ice core based on the accumul...
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Online Access: | http://hdl.handle.net/2122/7786 https://doi.org/10.1016/j.quascirev.2011.06.008 |
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ftingv:oai:www.earth-prints.org:2122/7786 2023-05-15T16:06:17+02:00 Toward a radiometric ice clock: uranium ages of the Dome C ice core Aciego, S. Bourdon, B. Schwander, J. Baur, H. Forieri, A. Aciego, S.; Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Bourdon, B.; Department of Geological Sciences, University of Michigan, Ann Arbor, MI, USA Schwander, J.; Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland Baur, H.; Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Forieri, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Department of Geological Sciences, University of Michigan, Ann Arbor, MI, USA Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia 2011 http://hdl.handle.net/2122/7786 https://doi.org/10.1016/j.quascirev.2011.06.008 en eng Elsevier Science Limited Quaternary Science Reviews 19-20/30(2011) 0277-3791 1873-457X http://hdl.handle.net/2122/7786 doi:10.1016/j.quascirev.2011.06.008 open Radiometric ice clock 02. Cryosphere::02.03. Ice cores::02.03.99. General or miscellaneous article 2011 ftingv https://doi.org/10.1016/j.quascirev.2011.06.008 2022-07-29T06:06:13Z Ice sheets and deep ice cores have yielded a wealth of paleoclimate information based on continuous dating methods while independent radiometric ages of ice have remained elusive. Here we demonstrate the application of (234U/238U) measurements to dating the EPICA Dome C ice core based on the accumulation of 234U in the ice matrix from recoil during 238U decay out of dust bound within the ice. Measured (234U/238U) activity ratios within the ice generally increase with depth while the surface areas of the dust grains are relatively constant. Using a newly designed device for measuring surface area for small samples, we were able to estimate reliably the recoil efficiency of nuclides from dust to ice. The resulting calculated radiometric ages range between 80 ka and 870 ka. Measured samples in the upper 3100 m fall on the previously published age-depth profile. Samples in the 3200–3255 m section show a marked change from 723–870 ka to 85 ka indicating homogenization of the deep ice prior to resetting of the (234U/238U) age in the basal layers. The mechanism for homogenization is likely enhanced lateral ice flow due to high basal melting and geothermal heat flux. Published 2389-2397 JCR Journal open Article in Journal/Newspaper EPICA ice core Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Quaternary Science Reviews 30 19-20 2389 2397 |
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Open Polar |
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Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Radiometric ice clock 02. Cryosphere::02.03. Ice cores::02.03.99. General or miscellaneous |
spellingShingle |
Radiometric ice clock 02. Cryosphere::02.03. Ice cores::02.03.99. General or miscellaneous Aciego, S. Bourdon, B. Schwander, J. Baur, H. Forieri, A. Toward a radiometric ice clock: uranium ages of the Dome C ice core |
topic_facet |
Radiometric ice clock 02. Cryosphere::02.03. Ice cores::02.03.99. General or miscellaneous |
description |
Ice sheets and deep ice cores have yielded a wealth of paleoclimate information based on continuous dating methods while independent radiometric ages of ice have remained elusive. Here we demonstrate the application of (234U/238U) measurements to dating the EPICA Dome C ice core based on the accumulation of 234U in the ice matrix from recoil during 238U decay out of dust bound within the ice. Measured (234U/238U) activity ratios within the ice generally increase with depth while the surface areas of the dust grains are relatively constant. Using a newly designed device for measuring surface area for small samples, we were able to estimate reliably the recoil efficiency of nuclides from dust to ice. The resulting calculated radiometric ages range between 80 ka and 870 ka. Measured samples in the upper 3100 m fall on the previously published age-depth profile. Samples in the 3200–3255 m section show a marked change from 723–870 ka to 85 ka indicating homogenization of the deep ice prior to resetting of the (234U/238U) age in the basal layers. The mechanism for homogenization is likely enhanced lateral ice flow due to high basal melting and geothermal heat flux. Published 2389-2397 JCR Journal open |
author2 |
Aciego, S.; Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Bourdon, B.; Department of Geological Sciences, University of Michigan, Ann Arbor, MI, USA Schwander, J.; Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland Baur, H.; Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Forieri, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia Institute of Geochemistry and Petrology, ETH Zurich, Switzerland Department of Geological Sciences, University of Michigan, Ann Arbor, MI, USA Climate and Environmental Physics, Physics Institute, University of Bern, Switzerland Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia |
format |
Article in Journal/Newspaper |
author |
Aciego, S. Bourdon, B. Schwander, J. Baur, H. Forieri, A. |
author_facet |
Aciego, S. Bourdon, B. Schwander, J. Baur, H. Forieri, A. |
author_sort |
Aciego, S. |
title |
Toward a radiometric ice clock: uranium ages of the Dome C ice core |
title_short |
Toward a radiometric ice clock: uranium ages of the Dome C ice core |
title_full |
Toward a radiometric ice clock: uranium ages of the Dome C ice core |
title_fullStr |
Toward a radiometric ice clock: uranium ages of the Dome C ice core |
title_full_unstemmed |
Toward a radiometric ice clock: uranium ages of the Dome C ice core |
title_sort |
toward a radiometric ice clock: uranium ages of the dome c ice core |
publisher |
Elsevier Science Limited |
publishDate |
2011 |
url |
http://hdl.handle.net/2122/7786 https://doi.org/10.1016/j.quascirev.2011.06.008 |
genre |
EPICA ice core |
genre_facet |
EPICA ice core |
op_relation |
Quaternary Science Reviews 19-20/30(2011) 0277-3791 1873-457X http://hdl.handle.net/2122/7786 doi:10.1016/j.quascirev.2011.06.008 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.quascirev.2011.06.008 |
container_title |
Quaternary Science Reviews |
container_volume |
30 |
container_issue |
19-20 |
container_start_page |
2389 |
op_container_end_page |
2397 |
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1766402175195414528 |