A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska
Abstract Burial Lake in northwest Alaska records changes in water level and regional vegetation since ∼ 39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiat...
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crcambridgeupr:10.1016/j.yqres.2010.03.007 2024-06-23T07:57:16+00:00 A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. 2010 http://dx.doi.org/10.1016/j.yqres.2010.03.007 http://api.elsevier.com/content/article/PII:S0033589410000256?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589410000256?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010012 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 74, issue 1, page 156-165 ISSN 0033-5894 1096-0287 journal-article 2010 crcambridgeupr https://doi.org/10.1016/j.yqres.2010.03.007 2024-06-12T04:05:01Z Abstract Burial Lake in northwest Alaska records changes in water level and regional vegetation since ∼ 39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiatus in deposition indicating a major drop in lake level and deflation of lacustrine sediments. MIS 3 vegetation was herb-shrub tundra; more xeric graminoid-herb tundra developed after 23,200 cal yr BP. The tundra gradually became more mesic after 17,000 cal yr BP. Expansions of Salix then Betula , at 15,000 and 14,000 cal yr BP, respectively, are coincident with a major rise in lake level marked by increasing fine-grained sediment and higher organic matter content. Several sites in the region display disrupted sedimentation and probable hiatuses during the last glacial maximum (LGM); together regional data indicate an arid interval prior to and during the LGM and continued low moisture levels until ∼ 15,000 cal yr BP. AMS 14 C dates from Burial Lake are approximately synchronous with AMS 14 C dates reported for the Betula expansion at nearby sites and sites across northern Alaska, but 1000–2000 yr younger than bulk-sediment dates. Article in Journal/Newspaper Tundra Alaska Cambridge University Press Quaternary Research 74 1 156 165 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Burial Lake in northwest Alaska records changes in water level and regional vegetation since ∼ 39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiatus in deposition indicating a major drop in lake level and deflation of lacustrine sediments. MIS 3 vegetation was herb-shrub tundra; more xeric graminoid-herb tundra developed after 23,200 cal yr BP. The tundra gradually became more mesic after 17,000 cal yr BP. Expansions of Salix then Betula , at 15,000 and 14,000 cal yr BP, respectively, are coincident with a major rise in lake level marked by increasing fine-grained sediment and higher organic matter content. Several sites in the region display disrupted sedimentation and probable hiatuses during the last glacial maximum (LGM); together regional data indicate an arid interval prior to and during the LGM and continued low moisture levels until ∼ 15,000 cal yr BP. AMS 14 C dates from Burial Lake are approximately synchronous with AMS 14 C dates reported for the Betula expansion at nearby sites and sites across northern Alaska, but 1000–2000 yr younger than bulk-sediment dates. |
format |
Article in Journal/Newspaper |
author |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. |
spellingShingle |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
author_facet |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. |
author_sort |
Abbott, Mark B. |
title |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_short |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_full |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_fullStr |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_full_unstemmed |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_sort |
40,000-yr record of environmental change from burial lake in northwest alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2010 |
url |
http://dx.doi.org/10.1016/j.yqres.2010.03.007 http://api.elsevier.com/content/article/PII:S0033589410000256?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589410000256?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400010012 |
genre |
Tundra Alaska |
genre_facet |
Tundra Alaska |
op_source |
Quaternary Research volume 74, issue 1, page 156-165 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2010.03.007 |
container_title |
Quaternary Research |
container_volume |
74 |
container_issue |
1 |
container_start_page |
156 |
op_container_end_page |
165 |
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1802650830884569088 |