Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum.
Reliable dating of glaciomarine sediments deposited on the Antarctic shelf since the Last Glacial Maximum (LGM) is challenging because of the rarity of calcareous (micro-) fossils and the recycling of fossil organic matter. Consequently, radiocarbon (14C) ages of the acid-insoluble organic fraction...
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/27054/ https://doi.org/10.1002/jqs.1308 |
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ftulancaster:oai:eprints.lancs.ac.uk:27054 2023-08-27T04:03:53+02:00 Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard Esper, Oliver Gersonde, Rainer Larter, Rob D. Maher, Barbara A. Moreton, Steven G. Shimmield, Tracy M. Korte, Monika 2010-03 https://eprints.lancs.ac.uk/id/eprint/27054/ https://doi.org/10.1002/jqs.1308 unknown Hillenbrand, Claus-Dieter and Smith, James A. and Kuhn, Gerhard and Esper, Oliver and Gersonde, Rainer and Larter, Rob D. and Maher, Barbara A. and Moreton, Steven G. and Shimmield, Tracy M. and Korte, Monika (2010) Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. Journal of Quaternary Science, 25 (3). pp. 280-295. ISSN 0267-8179 Journal Article PeerReviewed 2010 ftulancaster https://doi.org/10.1002/jqs.1308 2023-08-03T22:18:53Z Reliable dating of glaciomarine sediments deposited on the Antarctic shelf since the Last Glacial Maximum (LGM) is challenging because of the rarity of calcareous (micro-) fossils and the recycling of fossil organic matter. Consequently, radiocarbon (14C) ages of the acid-insoluble organic fraction (AIO) of the sediments bear uncertainties that are difficult to quantify. Here we present the results of three different methods to date a sedimentary unit consisting of diatomaceous ooze and diatomaceous mud that was deposited following the last deglaciation at five core sites on the inner shelf in the western Amundsen Sea (West Antarctica). In three cores conventional 14C dating of the AIO in bulk samples yielded age reversals down-core, but at all sites the AIO 14C ages obtained from diatomaceous ooze within the diatom-rich unit yielded similar uncorrected 14C ages between 13 51756 and 11 54347 years before present (a BP). Correction of these ages by subtracting the core-top ages, which probably reflect present-day deposition (as indicated by 210Pb dating of the sediment surface at one core site), yielded ages between ca. 10 500 and 8400 cal. a BP. Correction of the AIO ages of the diatomaceous ooze by only subtracting the marine reservoir effect (MRE) of 1300 a indicated deposition of the diatom-rich sediments between 14 100 and 11 900 cal. a BP. Most of these ages are consistent with age constraints between 13.0 and 8.0 ka for the diatom-rich unit, which we obtained by correlating the relative palaeomagnetic intensity (RPI) records of three of the sediment cores with global and regional reference curves. As a third dating technique we applied conventional radiocarbon dating of the AIO included in acid-cleaned diatom hard parts extracted from the diatomaceous ooze. This method yielded uncorrected 14C ages of only 511138 and 510638 a BP, respectively. We reject these young ages, because they are likely to be overprinted by the adsorption of modern atmospheric carbon dioxide onto the surfaces of the diatom hard ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica West Antarctica Lancaster University: Lancaster Eprints Amundsen Sea Antarctic The Antarctic West Antarctica Journal of Quaternary Science 25 3 280 295 |
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Open Polar |
collection |
Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
unknown |
description |
Reliable dating of glaciomarine sediments deposited on the Antarctic shelf since the Last Glacial Maximum (LGM) is challenging because of the rarity of calcareous (micro-) fossils and the recycling of fossil organic matter. Consequently, radiocarbon (14C) ages of the acid-insoluble organic fraction (AIO) of the sediments bear uncertainties that are difficult to quantify. Here we present the results of three different methods to date a sedimentary unit consisting of diatomaceous ooze and diatomaceous mud that was deposited following the last deglaciation at five core sites on the inner shelf in the western Amundsen Sea (West Antarctica). In three cores conventional 14C dating of the AIO in bulk samples yielded age reversals down-core, but at all sites the AIO 14C ages obtained from diatomaceous ooze within the diatom-rich unit yielded similar uncorrected 14C ages between 13 51756 and 11 54347 years before present (a BP). Correction of these ages by subtracting the core-top ages, which probably reflect present-day deposition (as indicated by 210Pb dating of the sediment surface at one core site), yielded ages between ca. 10 500 and 8400 cal. a BP. Correction of the AIO ages of the diatomaceous ooze by only subtracting the marine reservoir effect (MRE) of 1300 a indicated deposition of the diatom-rich sediments between 14 100 and 11 900 cal. a BP. Most of these ages are consistent with age constraints between 13.0 and 8.0 ka for the diatom-rich unit, which we obtained by correlating the relative palaeomagnetic intensity (RPI) records of three of the sediment cores with global and regional reference curves. As a third dating technique we applied conventional radiocarbon dating of the AIO included in acid-cleaned diatom hard parts extracted from the diatomaceous ooze. This method yielded uncorrected 14C ages of only 511138 and 510638 a BP, respectively. We reject these young ages, because they are likely to be overprinted by the adsorption of modern atmospheric carbon dioxide onto the surfaces of the diatom hard ... |
format |
Article in Journal/Newspaper |
author |
Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard Esper, Oliver Gersonde, Rainer Larter, Rob D. Maher, Barbara A. Moreton, Steven G. Shimmield, Tracy M. Korte, Monika |
spellingShingle |
Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard Esper, Oliver Gersonde, Rainer Larter, Rob D. Maher, Barbara A. Moreton, Steven G. Shimmield, Tracy M. Korte, Monika Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
author_facet |
Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard Esper, Oliver Gersonde, Rainer Larter, Rob D. Maher, Barbara A. Moreton, Steven G. Shimmield, Tracy M. Korte, Monika |
author_sort |
Hillenbrand, Claus-Dieter |
title |
Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
title_short |
Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
title_full |
Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
title_fullStr |
Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
title_full_unstemmed |
Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. |
title_sort |
age assignment of a diatomaceous ooze deposited in the western amundsen sea embayment after the last glacial maximum. |
publishDate |
2010 |
url |
https://eprints.lancs.ac.uk/id/eprint/27054/ https://doi.org/10.1002/jqs.1308 |
geographic |
Amundsen Sea Antarctic The Antarctic West Antarctica |
geographic_facet |
Amundsen Sea Antarctic The Antarctic West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctica West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica West Antarctica |
op_relation |
Hillenbrand, Claus-Dieter and Smith, James A. and Kuhn, Gerhard and Esper, Oliver and Gersonde, Rainer and Larter, Rob D. and Maher, Barbara A. and Moreton, Steven G. and Shimmield, Tracy M. and Korte, Monika (2010) Age assignment of a diatomaceous ooze deposited in the western Amundsen Sea embayment after the last glacial maximum. Journal of Quaternary Science, 25 (3). pp. 280-295. ISSN 0267-8179 |
op_doi |
https://doi.org/10.1002/jqs.1308 |
container_title |
Journal of Quaternary Science |
container_volume |
25 |
container_issue |
3 |
container_start_page |
280 |
op_container_end_page |
295 |
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1775347258502414336 |