Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes
The tephrochronology of the last 3000 years has been investigated in soil sections in north Iceland and in a marine sediment core from the north Icelandic shelf, 50 km offshore. Tephra markers, identified with major element geochemical analysis of volcanic glass shards, serve to correlate the marine...
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Norwegian Polar Institute
2002
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ftjpolarres:oai:journals.openacademia.net:article/2145 2023-05-15T15:06:39+02:00 Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes Larsen, Gudrun Eiríksson, Jón Knudsen, Karen Luise Heinemeier, Jan 2002-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2145 https://doi.org/10.3402/polar.v21i2.6489 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2145/5396 https://polarresearch.net/index.php/polar/article/view/2145 doi:10.3402/polar.v21i2.6489 Copyright (c) 2018 Polar Research Polar Research; Vol. 21 No. 2 (2002): Special issue: Proceedings of the Changes in Climate and Environment at High Latitudes Conference; 283-290 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2002 ftjpolarres https://doi.org/10.3402/polar.v21i2.6489 2021-11-11T19:12:09Z The tephrochronology of the last 3000 years has been investigated in soil sections in north Iceland and in a marine sediment core from the north Icelandic shelf, 50 km offshore. Tephra markers, identified with major element geochemical analysis of volcanic glass shards, serve to correlate the marine and terrestrial records. Hekla 3, the largest Holocene tephra marker from the volcano Hekla, in south Iceland, dated to 2980 years BP, is used as the basal unit in the tephra stratigraphy. AMS 14C dating of molluscs in the sediment core shows variable deviation from the tephrochronological age model, indicating that the reservoir age of the seawater mass at the coring site has varied with time. A standard marine reservoir correction of 400 14C years appears to be reasonable at the present day in the coastal and shelf waters around Iceland, which are dominated by the Irminger Current. However, values over 500 years are observed during the last 3000 years. We suggest that the intervals with increased and variable marine reservoir correction reflect incursions of Arctic water masses derived from the East Greenland Current to the area north of Iceland. Article in Journal/Newspaper Arctic East Greenland east greenland current Greenland Hekla Iceland Polar Research Polar Research (E-Journal) Arctic Greenland Polar Research 21 2 283 290 |
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Open Polar |
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Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
The tephrochronology of the last 3000 years has been investigated in soil sections in north Iceland and in a marine sediment core from the north Icelandic shelf, 50 km offshore. Tephra markers, identified with major element geochemical analysis of volcanic glass shards, serve to correlate the marine and terrestrial records. Hekla 3, the largest Holocene tephra marker from the volcano Hekla, in south Iceland, dated to 2980 years BP, is used as the basal unit in the tephra stratigraphy. AMS 14C dating of molluscs in the sediment core shows variable deviation from the tephrochronological age model, indicating that the reservoir age of the seawater mass at the coring site has varied with time. A standard marine reservoir correction of 400 14C years appears to be reasonable at the present day in the coastal and shelf waters around Iceland, which are dominated by the Irminger Current. However, values over 500 years are observed during the last 3000 years. We suggest that the intervals with increased and variable marine reservoir correction reflect incursions of Arctic water masses derived from the East Greenland Current to the area north of Iceland. |
format |
Article in Journal/Newspaper |
author |
Larsen, Gudrun Eiríksson, Jón Knudsen, Karen Luise Heinemeier, Jan |
spellingShingle |
Larsen, Gudrun Eiríksson, Jón Knudsen, Karen Luise Heinemeier, Jan Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
author_facet |
Larsen, Gudrun Eiríksson, Jón Knudsen, Karen Luise Heinemeier, Jan |
author_sort |
Larsen, Gudrun |
title |
Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
title_short |
Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
title_full |
Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
title_fullStr |
Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
title_full_unstemmed |
Correlation of late Holocene terrestrial and marine tephra markers, north Iceland: implications for reservoir age changes |
title_sort |
correlation of late holocene terrestrial and marine tephra markers, north iceland: implications for reservoir age changes |
publisher |
Norwegian Polar Institute |
publishDate |
2002 |
url |
https://polarresearch.net/index.php/polar/article/view/2145 https://doi.org/10.3402/polar.v21i2.6489 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic East Greenland east greenland current Greenland Hekla Iceland Polar Research |
genre_facet |
Arctic East Greenland east greenland current Greenland Hekla Iceland Polar Research |
op_source |
Polar Research; Vol. 21 No. 2 (2002): Special issue: Proceedings of the Changes in Climate and Environment at High Latitudes Conference; 283-290 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2145/5396 https://polarresearch.net/index.php/polar/article/view/2145 doi:10.3402/polar.v21i2.6489 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v21i2.6489 |
container_title |
Polar Research |
container_volume |
21 |
container_issue |
2 |
container_start_page |
283 |
op_container_end_page |
290 |
_version_ |
1766338220144984064 |