Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica
We present successful 81 Kr-Kr radiometric dating of ancient polarice. Krypton was extracted from the air bubbles in four∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The 81 Kr radiometric ages agree with indepe...
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ftunivbern:oai:boris.unibe.ch:74092 2023-08-20T04:01:54+02:00 Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica Buizert, C. Baggenstos, D. Jiang, W. Purtschert, R. Petrenko, V. V. Lu, Z.-T. Muller, P. Kuhl, T. Lee, J. Severinghaus, J. P. Brook, E. J. 2014 application/pdf https://boris.unibe.ch/74092/1/buizert14pnas.pdf https://boris.unibe.ch/74092/ eng eng National Academy of Sciences NAS https://boris.unibe.ch/74092/ info:eu-repo/semantics/restrictedAccess Buizert, C.; Baggenstos, D.; Jiang, W.; Purtschert, R.; Petrenko, V. V.; Lu, Z.-T.; Muller, P.; Kuhl, T.; Lee, J.; Severinghaus, J. P.; Brook, E. J. (2014). Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 111(19), pp. 6876-6881. National Academy of Sciences NAS 10.1073/pnas.1320329111 <http://dx.doi.org/10.1073/pnas.1320329111> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2014 ftunivbern https://doi.org/10.1073/pnas.1320329111 2023-07-31T21:21:25Z We present successful 81 Kr-Kr radiometric dating of ancient polarice. Krypton was extracted from the air bubbles in four∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The 81 Kr radiometric ages agree with independent age estimates obtained from stratigraphic dating techniques with a mean abso-lute age offset of 6±2.5 ka. Our experimental methods and sampling strategy are validated by (i) 85 Kr and 39 Ar analyses that show the samples to be free of modern air contamination and (ii)air content measurements that show the ice did not experience gas loss. We estimate the error in the 81 Kr ages due to past geomagnetic variability to be below 3 ka. We show that ice from the previous interglacial period (Marine Isotope Stage 5e, 130–115 ka before present) can be found in abundance near the surface of Taylor Glacier. Our study paves the way for reliable radiometric dating of ancient ice in blue ice areas and margin sites where large samples are available, greatly enhancing their scientific value as archives of old ice and meteorites. At present, ATTA 81Kr analysis requires a 40–80-kg ice sample; as sample requirements continue to decrease, 81 Kr dating of ice cores is a future possibility. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Taylor Glacier BORIS (Bern Open Repository and Information System, University of Bern) Atta ENVELOPE(90.985,90.985,75.603,75.603) McMurdo Dry Valleys Taylor Glacier ENVELOPE(162.167,162.167,-77.733,-77.733) Proceedings of the National Academy of Sciences 111 19 6876 6881 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Buizert, C. Baggenstos, D. Jiang, W. Purtschert, R. Petrenko, V. V. Lu, Z.-T. Muller, P. Kuhl, T. Lee, J. Severinghaus, J. P. Brook, E. J. Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
topic_facet |
530 Physics |
description |
We present successful 81 Kr-Kr radiometric dating of ancient polarice. Krypton was extracted from the air bubbles in four∼350-kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The 81 Kr radiometric ages agree with independent age estimates obtained from stratigraphic dating techniques with a mean abso-lute age offset of 6±2.5 ka. Our experimental methods and sampling strategy are validated by (i) 85 Kr and 39 Ar analyses that show the samples to be free of modern air contamination and (ii)air content measurements that show the ice did not experience gas loss. We estimate the error in the 81 Kr ages due to past geomagnetic variability to be below 3 ka. We show that ice from the previous interglacial period (Marine Isotope Stage 5e, 130–115 ka before present) can be found in abundance near the surface of Taylor Glacier. Our study paves the way for reliable radiometric dating of ancient ice in blue ice areas and margin sites where large samples are available, greatly enhancing their scientific value as archives of old ice and meteorites. At present, ATTA 81Kr analysis requires a 40–80-kg ice sample; as sample requirements continue to decrease, 81 Kr dating of ice cores is a future possibility. |
format |
Article in Journal/Newspaper |
author |
Buizert, C. Baggenstos, D. Jiang, W. Purtschert, R. Petrenko, V. V. Lu, Z.-T. Muller, P. Kuhl, T. Lee, J. Severinghaus, J. P. Brook, E. J. |
author_facet |
Buizert, C. Baggenstos, D. Jiang, W. Purtschert, R. Petrenko, V. V. Lu, Z.-T. Muller, P. Kuhl, T. Lee, J. Severinghaus, J. P. Brook, E. J. |
author_sort |
Buizert, C. |
title |
Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
title_short |
Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
title_full |
Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
title_fullStr |
Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
title_full_unstemmed |
Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica |
title_sort |
radiometric 81kr dating identifies 120,000-year-old ice at taylor glacier, antarctica |
publisher |
National Academy of Sciences NAS |
publishDate |
2014 |
url |
https://boris.unibe.ch/74092/1/buizert14pnas.pdf https://boris.unibe.ch/74092/ |
long_lat |
ENVELOPE(90.985,90.985,75.603,75.603) ENVELOPE(162.167,162.167,-77.733,-77.733) |
geographic |
Atta McMurdo Dry Valleys Taylor Glacier |
geographic_facet |
Atta McMurdo Dry Valleys Taylor Glacier |
genre |
Antarc* Antarctica McMurdo Dry Valleys Taylor Glacier |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys Taylor Glacier |
op_source |
Buizert, C.; Baggenstos, D.; Jiang, W.; Purtschert, R.; Petrenko, V. V.; Lu, Z.-T.; Muller, P.; Kuhl, T.; Lee, J.; Severinghaus, J. P.; Brook, E. J. (2014). Radiometric 81Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 111(19), pp. 6876-6881. National Academy of Sciences NAS 10.1073/pnas.1320329111 <http://dx.doi.org/10.1073/pnas.1320329111> |
op_relation |
https://boris.unibe.ch/74092/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1073/pnas.1320329111 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
111 |
container_issue |
19 |
container_start_page |
6876 |
op_container_end_page |
6881 |
_version_ |
1774712292414324736 |