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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ftstockholmuniv:oai:DiVA.org:su-88337 2023-05-15T14:28:57+02:00 Biogenic and detrital rich intervals in central arctic ocean cores identified using x ray fluorescence scanning Hanslik, Daniela Loewemark, Ludvig Jakobsson, Martin 2013 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88337 https://doi.org/10.3402/polar.v32i0.18386 eng eng Institutionen för geologiska vetenskaper Polar Research, 0800-0395, 2013, 32, s. 18386- http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88337 doi:10.3402/polar.v32i0.18386 ISI:000314828200001 info:eu-repo/semantics/openAccess Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Ecology Ekologi Article in journal info:eu-repo/semantics/article text 2013 ftstockholmuniv https://doi.org/10.3402/polar.v32i0.18386 2023-02-23T21:43:46Z 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. AuthorCount:3; Article in Journal/Newspaper Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Foraminifera* Greenland Iceberg* Lomonosov Ridge Polar Research Stockholm University: Publications (DiVA) 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 |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Ecology Ekologi |
spellingShingle |
Foraminifera Arctic Ocean IRD calcareous microfossils XRF scanning Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Ecology Ekologi Hanslik, Daniela Loewemark, Ludvig Jakobsson, Martin 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 Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Ecology Ekologi |
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. AuthorCount:3; |
format |
Article in Journal/Newspaper |
author |
Hanslik, Daniela Loewemark, Ludvig Jakobsson, Martin |
author_facet |
Hanslik, Daniela Loewemark, Ludvig Jakobsson, Martin |
author_sort |
Hanslik, Daniela |
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 |
Institutionen för geologiska vetenskaper |
publishDate |
2013 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88337 https://doi.org/10.3402/polar.v32i0.18386 |
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_relation |
Polar Research, 0800-0395, 2013, 32, s. 18386- http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88337 doi:10.3402/polar.v32i0.18386 ISI:000314828200001 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3402/polar.v32i0.18386 |
container_title |
Polar Research |
container_volume |
32 |
container_issue |
1 |
container_start_page |
18386 |
_version_ |
1766303075608297472 |