Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates
Five accelerator (TAMS system, University of Arizona) radiocarbon dates on small (30–50 mg) paired bivalves or shell fragments have been obtained on two piston cores. These dates are compared with conventional and accelerator 14 C dates on the total organic fraction (< 2 μm size fraction) from si...
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1985
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crcansciencepubl:10.1139/e85-194 2024-05-19T07:37:56+00:00 Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates Andrews, J. T. Jull, A. J. T. Donahue, D. J. Short, S. K. Osterman, L. E. 1985 http://dx.doi.org/10.1139/e85-194 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-194 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 12, page 1827-1834 ISSN 0008-4077 1480-3313 journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-194 2024-05-02T06:51:25Z Five accelerator (TAMS system, University of Arizona) radiocarbon dates on small (30–50 mg) paired bivalves or shell fragments have been obtained on two piston cores. These dates are compared with conventional and accelerator 14 C dates on the total organic fraction (< 2 μm size fraction) from similar levels in the two cores. The shell dates are always younger by several thousands of years. We argue that the shell dates are the more reliable; for example, we demonstrate that pre-Quaternary pollen is abundant in the lowermost 6 m in core HU77-159 from Frobisher Bay. Since the occurrence of shells is rare in piston cores, we have developed an empirical relation that enables us to change dates on organic matter to a more probable "true" age. If this correction is applied to dates on the total organic fraction that we obtained on an additional five cores from fiord and shelf sites, a consistent pattern of sedimentation rate variations is shown. This indicates that sedimentation rates were highest between ca. 9000 and 6500 years BP, a time when fiord glaciers in Baffin Island were undergoing substantial retreat. Article in Journal/Newspaper Baffin Island Baffin Frobisher Bay Canadian Science Publishing Canadian Journal of Earth Sciences 22 12 1827 1834 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Five accelerator (TAMS system, University of Arizona) radiocarbon dates on small (30–50 mg) paired bivalves or shell fragments have been obtained on two piston cores. These dates are compared with conventional and accelerator 14 C dates on the total organic fraction (< 2 μm size fraction) from similar levels in the two cores. The shell dates are always younger by several thousands of years. We argue that the shell dates are the more reliable; for example, we demonstrate that pre-Quaternary pollen is abundant in the lowermost 6 m in core HU77-159 from Frobisher Bay. Since the occurrence of shells is rare in piston cores, we have developed an empirical relation that enables us to change dates on organic matter to a more probable "true" age. If this correction is applied to dates on the total organic fraction that we obtained on an additional five cores from fiord and shelf sites, a consistent pattern of sedimentation rate variations is shown. This indicates that sedimentation rates were highest between ca. 9000 and 6500 years BP, a time when fiord glaciers in Baffin Island were undergoing substantial retreat. |
format |
Article in Journal/Newspaper |
author |
Andrews, J. T. Jull, A. J. T. Donahue, D. J. Short, S. K. Osterman, L. E. |
spellingShingle |
Andrews, J. T. Jull, A. J. T. Donahue, D. J. Short, S. K. Osterman, L. E. Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
author_facet |
Andrews, J. T. Jull, A. J. T. Donahue, D. J. Short, S. K. Osterman, L. E. |
author_sort |
Andrews, J. T. |
title |
Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
title_short |
Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
title_full |
Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
title_fullStr |
Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
title_full_unstemmed |
Sedimentation rates in Baffin Island fiord cores from comparative radiocarbon dates |
title_sort |
sedimentation rates in baffin island fiord cores from comparative radiocarbon dates |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-194 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-194 |
genre |
Baffin Island Baffin Frobisher Bay |
genre_facet |
Baffin Island Baffin Frobisher Bay |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 12, page 1827-1834 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-194 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
12 |
container_start_page |
1827 |
op_container_end_page |
1834 |
_version_ |
1799477325339820032 |