Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs
Novaya Zemlya was covered by the eastern part of the Barents-Kara ice sheet during the glacial maximum of marine isotope stage 2 (MIS 2). We obtained (14)C ages on 37 samples of mollusc shells from various sites on the islands. Most samples yielded ages in the range of 48-26 (14)C Ky. Such old sampl...
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ftnortharizonaun:oai:openknowledge.nau.edu:1679 2023-05-15T16:40:23+02:00 Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs Mangerud, Jan Kaufman, Darrell Hansen, Jesper Svendsen, John Inge 2008 text http://openknowledge.nau.edu/1679/ http://openknowledge.nau.edu/1679/8/Mangerud_J_etal_2008_ice-free_conditions_novaya_35000_bp%281%29.pdf https://doi.org/10.1111/j.1751-8369.2008.00064.x en eng http://openknowledge.nau.edu/1679/8/Mangerud_J_etal_2008_ice-free_conditions_novaya_35000_bp%281%29.pdf Mangerud, Jan and Kaufman, Darrell and Hansen, Jesper and Svendsen, John Inge (2008) Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs. Polar Research, 27 (2). pp. 187-208. ISSN 1751-8369 QE Geology Article PeerReviewed 2008 ftnortharizonaun https://doi.org/10.1111/j.1751-8369.2008.00064.x 2020-12-11T11:44:04Z Novaya Zemlya was covered by the eastern part of the Barents-Kara ice sheet during the glacial maximum of marine isotope stage 2 (MIS 2). We obtained (14)C ages on 37 samples of mollusc shells from various sites on the islands. Most samples yielded ages in the range of 48-26 (14)C Ky. Such old samples are sensitive to contamination by young (14)C, and therefore their reliability was assessed using replicate analyses and amino acid geochronology. The extent of aspartic acid racemization (Asp D/L) indicates that many of the (14)C ages are correct, whereas some are minimum ages only. The results indicate that a substantial part of Novaya Zemlya was ice-free about 35-27 (14)C Kya, and probably even earlier. Corresponding shorelines up to > 140 m a.s.l. indicate a large Barents-Kara ice sheet during early MIS 3. These results are consistent with findings from Svalbard and northern Russia: in both places a large MIS 4/3 Barents-Kara ice sheet is postulated to have retreated about 50 Kya, followed by an ice-free interstadial that lasted until up to ca. 25 Kya. The duration of the MIS 2 glaciation in Novaya Zemlya was calculated by applying the D/L values to a kinetic equation for Asp racemization. This indicates that the islands were ice covered for less than 3000 years if the basal temperature was 0(o)C, and for less than 10 000 years if it was -5 degrees C. Article in Journal/Newspaper Ice Sheet Novaya Zemlya Polar Research Svalbard OpenKnowledge@NAU (Northern Arizona University, Flagstaff) Kya ENVELOPE(8.308,8.308,63.772,63.772) Svalbard Polar Research 27 2 187 208 |
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Open Polar |
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OpenKnowledge@NAU (Northern Arizona University, Flagstaff) |
op_collection_id |
ftnortharizonaun |
language |
English |
topic |
QE Geology |
spellingShingle |
QE Geology Mangerud, Jan Kaufman, Darrell Hansen, Jesper Svendsen, John Inge Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
topic_facet |
QE Geology |
description |
Novaya Zemlya was covered by the eastern part of the Barents-Kara ice sheet during the glacial maximum of marine isotope stage 2 (MIS 2). We obtained (14)C ages on 37 samples of mollusc shells from various sites on the islands. Most samples yielded ages in the range of 48-26 (14)C Ky. Such old samples are sensitive to contamination by young (14)C, and therefore their reliability was assessed using replicate analyses and amino acid geochronology. The extent of aspartic acid racemization (Asp D/L) indicates that many of the (14)C ages are correct, whereas some are minimum ages only. The results indicate that a substantial part of Novaya Zemlya was ice-free about 35-27 (14)C Kya, and probably even earlier. Corresponding shorelines up to > 140 m a.s.l. indicate a large Barents-Kara ice sheet during early MIS 3. These results are consistent with findings from Svalbard and northern Russia: in both places a large MIS 4/3 Barents-Kara ice sheet is postulated to have retreated about 50 Kya, followed by an ice-free interstadial that lasted until up to ca. 25 Kya. The duration of the MIS 2 glaciation in Novaya Zemlya was calculated by applying the D/L values to a kinetic equation for Asp racemization. This indicates that the islands were ice covered for less than 3000 years if the basal temperature was 0(o)C, and for less than 10 000 years if it was -5 degrees C. |
format |
Article in Journal/Newspaper |
author |
Mangerud, Jan Kaufman, Darrell Hansen, Jesper Svendsen, John Inge |
author_facet |
Mangerud, Jan Kaufman, Darrell Hansen, Jesper Svendsen, John Inge |
author_sort |
Mangerud, Jan |
title |
Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
title_short |
Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
title_full |
Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
title_fullStr |
Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
title_full_unstemmed |
Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
title_sort |
ice-free conditions in novaya zemlya 35,000 to 30,000 cal years bp, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs |
publishDate |
2008 |
url |
http://openknowledge.nau.edu/1679/ http://openknowledge.nau.edu/1679/8/Mangerud_J_etal_2008_ice-free_conditions_novaya_35000_bp%281%29.pdf https://doi.org/10.1111/j.1751-8369.2008.00064.x |
long_lat |
ENVELOPE(8.308,8.308,63.772,63.772) |
geographic |
Kya Svalbard |
geographic_facet |
Kya Svalbard |
genre |
Ice Sheet Novaya Zemlya Polar Research Svalbard |
genre_facet |
Ice Sheet Novaya Zemlya Polar Research Svalbard |
op_relation |
http://openknowledge.nau.edu/1679/8/Mangerud_J_etal_2008_ice-free_conditions_novaya_35000_bp%281%29.pdf Mangerud, Jan and Kaufman, Darrell and Hansen, Jesper and Svendsen, John Inge (2008) Ice-free conditions in Novaya Zemlya 35,000 to 30,000 cal years BP, as indicated by radiocarbon ages and amino acid racemization evidence from marine molluscs. Polar Research, 27 (2). pp. 187-208. ISSN 1751-8369 |
op_doi |
https://doi.org/10.1111/j.1751-8369.2008.00064.x |
container_title |
Polar Research |
container_volume |
27 |
container_issue |
2 |
container_start_page |
187 |
op_container_end_page |
208 |
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1766030779226259456 |