Isothermal remanent magnetization of Greenland ice: Preliminary results
The magnetic mineral content of wind“transported dust should reflect atmospheric transport dynamics and conditions in its source areas, and could thus be used as an environmental proxy. To test the feasibility of determining the magnetic mineral content in polar ice, isothermal remanent magnetizatio...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D89G5XB6 2024-09-15T18:09:09+00:00 Isothermal remanent magnetization of Greenland ice: Preliminary results Lanci, Luca Kent, Dennis V. Biscaye, Pierre E. Bory, Aloys Jean-Mathias 2001 https://doi.org/10.7916/D89G5XB6 English eng https://doi.org/10.7916/D89G5XB6 Geophysics Articles 2001 ftcolumbiauniv https://doi.org/10.7916/D89G5XB6 2024-08-23T04:10:25Z The magnetic mineral content of wind“transported dust should reflect atmospheric transport dynamics and conditions in its source areas, and could thus be used as an environmental proxy. To test the feasibility of determining the magnetic mineral content in polar ice, isothermal remanent magnetization (IRM) was measured on a small suite of Greenland ice samples of Holocene (interglacial) and Last Glacial Maximum (LGM) age. Although the extremely low dust concentrations limit weak field (susceptibility) measurements, all samples contained an easily measurable concentration of magnetic minerals that can be estimated using IRM intensity provided that special precautions are used. IRM experiments at liquid nitrogen temperatures indicate ice magnetic properties which are consistent with that expected from varying concentrations of magnetite or maghemite. Interestingly, the Holocene ice samples tend to have higher magnetic concentrations, despite having much lower total polar dust contents, than the few LGM ice samples tested thus far. Article in Journal/Newspaper Greenland Columbia University: Academic Commons |
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Open Polar |
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Columbia University: Academic Commons |
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ftcolumbiauniv |
language |
English |
topic |
Geophysics |
spellingShingle |
Geophysics Lanci, Luca Kent, Dennis V. Biscaye, Pierre E. Bory, Aloys Jean-Mathias Isothermal remanent magnetization of Greenland ice: Preliminary results |
topic_facet |
Geophysics |
description |
The magnetic mineral content of wind“transported dust should reflect atmospheric transport dynamics and conditions in its source areas, and could thus be used as an environmental proxy. To test the feasibility of determining the magnetic mineral content in polar ice, isothermal remanent magnetization (IRM) was measured on a small suite of Greenland ice samples of Holocene (interglacial) and Last Glacial Maximum (LGM) age. Although the extremely low dust concentrations limit weak field (susceptibility) measurements, all samples contained an easily measurable concentration of magnetic minerals that can be estimated using IRM intensity provided that special precautions are used. IRM experiments at liquid nitrogen temperatures indicate ice magnetic properties which are consistent with that expected from varying concentrations of magnetite or maghemite. Interestingly, the Holocene ice samples tend to have higher magnetic concentrations, despite having much lower total polar dust contents, than the few LGM ice samples tested thus far. |
format |
Article in Journal/Newspaper |
author |
Lanci, Luca Kent, Dennis V. Biscaye, Pierre E. Bory, Aloys Jean-Mathias |
author_facet |
Lanci, Luca Kent, Dennis V. Biscaye, Pierre E. Bory, Aloys Jean-Mathias |
author_sort |
Lanci, Luca |
title |
Isothermal remanent magnetization of Greenland ice: Preliminary results |
title_short |
Isothermal remanent magnetization of Greenland ice: Preliminary results |
title_full |
Isothermal remanent magnetization of Greenland ice: Preliminary results |
title_fullStr |
Isothermal remanent magnetization of Greenland ice: Preliminary results |
title_full_unstemmed |
Isothermal remanent magnetization of Greenland ice: Preliminary results |
title_sort |
isothermal remanent magnetization of greenland ice: preliminary results |
publishDate |
2001 |
url |
https://doi.org/10.7916/D89G5XB6 |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://doi.org/10.7916/D89G5XB6 |
op_doi |
https://doi.org/10.7916/D89G5XB6 |
_version_ |
1810446563975102464 |