Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning
X-ray fluorescence (XRF) scanning of sediment cores from the Lomonosov Ridge and the Morris Jesup Rise reveals a distinct pattern of Ca intensity peaks through Marine Isotope Stages (MIS) 1 to 7. Downcore of MIS 7, the Ca signal is more irregular and near the detection limit. Virtually all major pea...
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Norwegian Polar Institute
2013
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ftdoajarticles:oai:doaj.org/article:5dcb4036b6224111944118bc73858ec8 2023-05-15T14:28:58+02:00 Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning Daniela Hanslik Ludvig Löwemark Martin Jakobsson 2013-02-01T00:00:00Z https://doi.org/10.3402/polar.v32i0.18386 https://doaj.org/article/5dcb4036b6224111944118bc73858ec8 EN eng Norwegian Polar Institute http://www.polarresearch.net/index.php/polar/article/view/18386/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.18386 0800-0395 1751-8369 https://doaj.org/article/5dcb4036b6224111944118bc73858ec8 Polar Research, Vol 32, Iss 0, Pp 1-10 (2013) Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Environmental sciences GE1-350 Oceanography GC1-1581 article 2013 ftdoajarticles https://doi.org/10.3402/polar.v32i0.18386 2022-12-31T12:33:31Z X-ray fluorescence (XRF) scanning of sediment cores from the Lomonosov Ridge and the Morris Jesup Rise reveals a distinct pattern of Ca intensity peaks through Marine Isotope Stages (MIS) 1 to 7. Downcore of MIS 7, the Ca signal is more irregular and near the detection limit. Virtually all major peaks in Ca coincide with a high abundance of calcareous microfossils; this is particularly conspicuous in the cores from the central Arctic Ocean. However, the recorded Ca signal is generally caused by a combination of biogenic and detrital carbonate, and in areas influenced by input from the Canadian Arctic, detrital carbonates may effectively mask the foraminiferal carbonates. Despite this, there is a strong correlation between XRF-detected Ca content and foraminiferal abundance. We propose that in the Arctic Ocean north of Greenland a common palaeoceanographic mechanism is controlling Ca-rich ice-rafted debris (IRD) and foraminiferal abundance. Previous studies have shown that glacial periods are characterized by foraminfer-barren sediments. This implies that the Ca-rich IRD intervals with abundant foraminifera were most likely deposited during interglacial periods when glaciers left in the Canadian Arctic Archipelago were still active and delivered a large amount of icebergs. At the same time, conditions were favourable for planktic foraminifera, resulting in a strong covariance between these proxies. Therefore, we suggest that the XRF scanner's capability to efficiently map Ca concentrations in sediment cores makes it possible to systematically examine large numbers of cores from different regions to investigate the palaeoceanographic reasons for the calcareous microfossils’ spatial and temporal variability. Article in Journal/Newspaper Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Foraminifera* Greenland Iceberg* Lomonosov Ridge Polar Research Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Canadian Arctic Archipelago Greenland Morris Jesup Rise ENVELOPE(-20.000,-20.000,83.750,83.750) Polar Research 32 1 18386 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Environmental sciences GE1-350 Oceanography GC1-1581 Daniela Hanslik Ludvig Löwemark Martin Jakobsson Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
topic_facet |
Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
X-ray fluorescence (XRF) scanning of sediment cores from the Lomonosov Ridge and the Morris Jesup Rise reveals a distinct pattern of Ca intensity peaks through Marine Isotope Stages (MIS) 1 to 7. Downcore of MIS 7, the Ca signal is more irregular and near the detection limit. Virtually all major peaks in Ca coincide with a high abundance of calcareous microfossils; this is particularly conspicuous in the cores from the central Arctic Ocean. However, the recorded Ca signal is generally caused by a combination of biogenic and detrital carbonate, and in areas influenced by input from the Canadian Arctic, detrital carbonates may effectively mask the foraminiferal carbonates. Despite this, there is a strong correlation between XRF-detected Ca content and foraminiferal abundance. We propose that in the Arctic Ocean north of Greenland a common palaeoceanographic mechanism is controlling Ca-rich ice-rafted debris (IRD) and foraminiferal abundance. Previous studies have shown that glacial periods are characterized by foraminfer-barren sediments. This implies that the Ca-rich IRD intervals with abundant foraminifera were most likely deposited during interglacial periods when glaciers left in the Canadian Arctic Archipelago were still active and delivered a large amount of icebergs. At the same time, conditions were favourable for planktic foraminifera, resulting in a strong covariance between these proxies. Therefore, we suggest that the XRF scanner's capability to efficiently map Ca concentrations in sediment cores makes it possible to systematically examine large numbers of cores from different regions to investigate the palaeoceanographic reasons for the calcareous microfossils’ spatial and temporal variability. |
format |
Article in Journal/Newspaper |
author |
Daniela Hanslik Ludvig Löwemark Martin Jakobsson |
author_facet |
Daniela Hanslik Ludvig Löwemark Martin Jakobsson |
author_sort |
Daniela Hanslik |
title |
Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
title_short |
Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
title_full |
Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
title_fullStr |
Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
title_full_unstemmed |
Biogenic and detrital-rich intervals in central Arctic Ocean cores identified using x-ray fluorescence scanning |
title_sort |
biogenic and detrital-rich intervals in central arctic ocean cores identified using x-ray fluorescence scanning |
publisher |
Norwegian Polar Institute |
publishDate |
2013 |
url |
https://doi.org/10.3402/polar.v32i0.18386 https://doaj.org/article/5dcb4036b6224111944118bc73858ec8 |
long_lat |
ENVELOPE(-20.000,-20.000,83.750,83.750) |
geographic |
Arctic Arctic Ocean Canadian Arctic Archipelago Greenland Morris Jesup Rise |
geographic_facet |
Arctic Arctic Ocean Canadian Arctic Archipelago Greenland Morris Jesup Rise |
genre |
Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Foraminifera* Greenland Iceberg* Lomonosov Ridge Polar Research |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Foraminifera* Greenland Iceberg* Lomonosov Ridge Polar Research |
op_source |
Polar Research, Vol 32, Iss 0, Pp 1-10 (2013) |
op_relation |
http://www.polarresearch.net/index.php/polar/article/view/18386/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v32i0.18386 0800-0395 1751-8369 https://doaj.org/article/5dcb4036b6224111944118bc73858ec8 |
op_doi |
https://doi.org/10.3402/polar.v32i0.18386 |
container_title |
Polar Research |
container_volume |
32 |
container_issue |
1 |
container_start_page |
18386 |
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1766303077412896768 |