Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies
Tephra-grain counting, morphology and geochemistry in the 150–1000 μm size fraction were used to identify 22 individual tephra horizons and one visible tephra layer (Saksunarvatn) from postglacial sediment of the north Iceland shelf. Core MD99-2269 (66°37.53‘N, 20°51.16‘W, water depth 365 m, length...
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crsagepubl:10.1177/0959683607075829 2023-05-15T16:34:02+02:00 Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies Kristjánsdóttir, Gréta Björk Stoner, Joseph S. Jennings, Anne E. Andrews, John T. Grönvold, Karl 2007 http://dx.doi.org/10.1177/0959683607075829 http://journals.sagepub.com/doi/pdf/10.1177/0959683607075829 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 17, issue 2, page 155-176 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2007 crsagepubl https://doi.org/10.1177/0959683607075829 2022-08-12T11:27:46Z Tephra-grain counting, morphology and geochemistry in the 150–1000 μm size fraction were used to identify 22 individual tephra horizons and one visible tephra layer (Saksunarvatn) from postglacial sediment of the north Iceland shelf. Core MD99-2269 (66°37.53‘N, 20°51.16‘W, water depth 365 m, length 2533 cm) from the Reykjafjardaráll basin is constrained at the base by the Vedde tephra (c. 12 000 cal. yr BP). Geochemical analyses and stratigraphical position of the 22 tephra horizons were used to identify the following cryptotephras: KOL-1372 (AD 1372), Hekla 1104 (AD 1104), Snæfellsnes 1 (c. 1790 cal. yr BP), Hekla 3 (c. 2970 cal. yr BP), Hekla 4 (c. 4230 cal. yr BP), TV 5 (c. 6860 cal. yr BP) and Suduroy (c. 8070 cal. yr BP). A tephra of the same geochemistry as KOL-1372 was found near the base of the core and is here named KOL3-2269 (>11 000 cal. yr BP). Eleven additional cryptotephras were geochemically typed to their respective Icelandic volcanic centres of origin and their ages constrained. Four tephra horizons had a very heterogeneous geochemical signal and may reflect secondary rather than primary deposition although we speculate whether the heterogeneity may be due to mixing of distinct cryptotephras within our sample. The cryptotephras and one visible tephra layer (Saksunarvatn) were intercalibrated with the combined MD99-2269 and MD99-2322 (67°08.18‘N, 30°49.67‘W, 714 m water depth, length 2617 cm) palaeomagnetic secular variation record, in depth and on a calibrated radiocarbon chronology, providing a fundamental chronological and stratigraphic template for future studies of environmental and volcanic variability for the Icelandic region, eastern North Atlantic and NW Europe. Article in Journal/Newspaper Hekla Iceland North Atlantic SAGE Publications (via Crossref) Kol’ ENVELOPE(155.946,155.946,53.834,53.834) Saksunarvatn ENVELOPE(-7.150,-7.150,62.233,62.233) Suduroy ENVELOPE(-6.830,-6.830,61.519,61.519) The Holocene 17 2 155 176 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Kristjánsdóttir, Gréta Björk Stoner, Joseph S. Jennings, Anne E. Andrews, John T. Grönvold, Karl Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Tephra-grain counting, morphology and geochemistry in the 150–1000 μm size fraction were used to identify 22 individual tephra horizons and one visible tephra layer (Saksunarvatn) from postglacial sediment of the north Iceland shelf. Core MD99-2269 (66°37.53‘N, 20°51.16‘W, water depth 365 m, length 2533 cm) from the Reykjafjardaráll basin is constrained at the base by the Vedde tephra (c. 12 000 cal. yr BP). Geochemical analyses and stratigraphical position of the 22 tephra horizons were used to identify the following cryptotephras: KOL-1372 (AD 1372), Hekla 1104 (AD 1104), Snæfellsnes 1 (c. 1790 cal. yr BP), Hekla 3 (c. 2970 cal. yr BP), Hekla 4 (c. 4230 cal. yr BP), TV 5 (c. 6860 cal. yr BP) and Suduroy (c. 8070 cal. yr BP). A tephra of the same geochemistry as KOL-1372 was found near the base of the core and is here named KOL3-2269 (>11 000 cal. yr BP). Eleven additional cryptotephras were geochemically typed to their respective Icelandic volcanic centres of origin and their ages constrained. Four tephra horizons had a very heterogeneous geochemical signal and may reflect secondary rather than primary deposition although we speculate whether the heterogeneity may be due to mixing of distinct cryptotephras within our sample. The cryptotephras and one visible tephra layer (Saksunarvatn) were intercalibrated with the combined MD99-2269 and MD99-2322 (67°08.18‘N, 30°49.67‘W, 714 m water depth, length 2617 cm) palaeomagnetic secular variation record, in depth and on a calibrated radiocarbon chronology, providing a fundamental chronological and stratigraphic template for future studies of environmental and volcanic variability for the Icelandic region, eastern North Atlantic and NW Europe. |
format |
Article in Journal/Newspaper |
author |
Kristjánsdóttir, Gréta Björk Stoner, Joseph S. Jennings, Anne E. Andrews, John T. Grönvold, Karl |
author_facet |
Kristjánsdóttir, Gréta Björk Stoner, Joseph S. Jennings, Anne E. Andrews, John T. Grönvold, Karl |
author_sort |
Kristjánsdóttir, Gréta Björk |
title |
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
title_short |
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
title_full |
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
title_fullStr |
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
title_full_unstemmed |
Geochemistry of Holocene cryptotephras from the North Iceland Shelf (MD99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
title_sort |
geochemistry of holocene cryptotephras from the north iceland shelf (md99-2269): intercalibration with radiocarbon and palaeomagnetic chronostratigraphies |
publisher |
SAGE Publications |
publishDate |
2007 |
url |
http://dx.doi.org/10.1177/0959683607075829 http://journals.sagepub.com/doi/pdf/10.1177/0959683607075829 |
long_lat |
ENVELOPE(155.946,155.946,53.834,53.834) ENVELOPE(-7.150,-7.150,62.233,62.233) ENVELOPE(-6.830,-6.830,61.519,61.519) |
geographic |
Kol’ Saksunarvatn Suduroy |
geographic_facet |
Kol’ Saksunarvatn Suduroy |
genre |
Hekla Iceland North Atlantic |
genre_facet |
Hekla Iceland North Atlantic |
op_source |
The Holocene volume 17, issue 2, page 155-176 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683607075829 |
container_title |
The Holocene |
container_volume |
17 |
container_issue |
2 |
container_start_page |
155 |
op_container_end_page |
176 |
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1766023778707439616 |