Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments
Five sediment cores from three different areas, the Jan Mayen Fracture Zone in the Greenland Sea, the Fram Strait and the Makarov Basin in the Arctic Ocean have been subjected to a detailed analysis of the magnetic fabric by analysing their anisotropy of magnetic susceptibility (AMS) as a supplement...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_229410 2023-05-15T14:50:21+02:00 Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments Nowaczyk, N. 2003 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410 https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410_3/component/file_2212919/229410.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-246X.2003.01844.x https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410 https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410_3/component/file_2212919/229410.pdf info:eu-repo/semantics/openAccess Geophysical Journal International 550 - Earth sciences info:eu-repo/semantics/article 2003 ftgfzpotsdam https://doi.org/10.1046/j.1365-246X.2003.01844.x 2022-09-14T05:56:46Z Five sediment cores from three different areas, the Jan Mayen Fracture Zone in the Greenland Sea, the Fram Strait and the Makarov Basin in the Arctic Ocean have been subjected to a detailed analysis of the magnetic fabric by analysing their anisotropy of magnetic susceptibility (AMS) as a supplementary parameter to already existing palaeo- and rock magnetic data sets. Intervals of reversed inclinations documented within the five cores can be interpreted as geomagnetic excursions because all the investigated sediments are characterized by an undisturbed magnetic fabric as expected for layered sediments, that is, an oblate anisotropy ellipsoid with its short principal axis oriented vertically. Excursional directions are also not associated with significant changes in rock magnetic parameters. However, cores from the Arctic Ocean, in particular, exhibit a strong cyclicity in their anisotropy parameters. Here, sand-rich layers are characterized by a low anisotropy, whereas clay rich layers yielded highest anisotropy degrees of up to 9 per cent indicating an AMS mainly controlled by the matrix properties of the sediment. A simple three-axis determination of the anisotropy of anhysteretic remanent magnetization (AARM) on one of these cores surprisingly yielded an even higher degree of anisotropy of the ferrimagnetic fraction of up to 18 per cent, i.e. twice as high as determined for the susceptibility, which is also influenced by the paramagnetic fraction. This implies a strong contribution of this sediment fraction to the overall magnetic susceptibility of the investigated Arctic Ocean deposits Article in Journal/Newspaper Arctic Arctic Ocean Fram Strait Greenland Greenland Sea Jan Mayen Magnetic susceptibility makarov basin GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Arctic Arctic Ocean Greenland Jan Mayen Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Jan Mayen Fracture Zone ENVELOPE(-8.000,-8.000,71.200,71.200) Geophysical Journal International 152 2 302 317 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Nowaczyk, N. Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
topic_facet |
550 - Earth sciences |
description |
Five sediment cores from three different areas, the Jan Mayen Fracture Zone in the Greenland Sea, the Fram Strait and the Makarov Basin in the Arctic Ocean have been subjected to a detailed analysis of the magnetic fabric by analysing their anisotropy of magnetic susceptibility (AMS) as a supplementary parameter to already existing palaeo- and rock magnetic data sets. Intervals of reversed inclinations documented within the five cores can be interpreted as geomagnetic excursions because all the investigated sediments are characterized by an undisturbed magnetic fabric as expected for layered sediments, that is, an oblate anisotropy ellipsoid with its short principal axis oriented vertically. Excursional directions are also not associated with significant changes in rock magnetic parameters. However, cores from the Arctic Ocean, in particular, exhibit a strong cyclicity in their anisotropy parameters. Here, sand-rich layers are characterized by a low anisotropy, whereas clay rich layers yielded highest anisotropy degrees of up to 9 per cent indicating an AMS mainly controlled by the matrix properties of the sediment. A simple three-axis determination of the anisotropy of anhysteretic remanent magnetization (AARM) on one of these cores surprisingly yielded an even higher degree of anisotropy of the ferrimagnetic fraction of up to 18 per cent, i.e. twice as high as determined for the susceptibility, which is also influenced by the paramagnetic fraction. This implies a strong contribution of this sediment fraction to the overall magnetic susceptibility of the investigated Arctic Ocean deposits |
format |
Article in Journal/Newspaper |
author |
Nowaczyk, N. |
author_facet |
Nowaczyk, N. |
author_sort |
Nowaczyk, N. |
title |
Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
title_short |
Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
title_full |
Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
title_fullStr |
Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
title_full_unstemmed |
Detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
title_sort |
detailed study on the anisotropy of magnetic susceptibility of arctic marine sediments |
publishDate |
2003 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410 https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410_3/component/file_2212919/229410.pdf |
long_lat |
ENVELOPE(170.000,170.000,87.000,87.000) ENVELOPE(-8.000,-8.000,71.200,71.200) |
geographic |
Arctic Arctic Ocean Greenland Jan Mayen Makarov Basin Jan Mayen Fracture Zone |
geographic_facet |
Arctic Arctic Ocean Greenland Jan Mayen Makarov Basin Jan Mayen Fracture Zone |
genre |
Arctic Arctic Ocean Fram Strait Greenland Greenland Sea Jan Mayen Magnetic susceptibility makarov basin |
genre_facet |
Arctic Arctic Ocean Fram Strait Greenland Greenland Sea Jan Mayen Magnetic susceptibility makarov basin |
op_source |
Geophysical Journal International |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-246X.2003.01844.x https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410 https://gfzpublic.gfz-potsdam.de/pubman/item/item_229410_3/component/file_2212919/229410.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1046/j.1365-246X.2003.01844.x |
container_title |
Geophysical Journal International |
container_volume |
152 |
container_issue |
2 |
container_start_page |
302 |
op_container_end_page |
317 |
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1766321390999306240 |