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 magnetizati...
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ftdatacite:10.7916/d89g5xb6 2023-05-15T16:27:13+02:00 Isothermal remanent magnetization of Greenland ice: Preliminary results Lanci, Luca Kent, Dennis V. Biscaye, Pierre E. Bory, Aloys Jean-Mathias 2001 https://dx.doi.org/10.7916/d89g5xb6 https://academiccommons.columbia.edu/doi/10.7916/D89G5XB6 unknown Columbia University Geophysics Text Articles article-journal ScholarlyArticle 2001 ftdatacite https://doi.org/10.7916/d89g5xb6 2021-11-05T12:55:41Z 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. Text Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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Geophysics |
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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 |
Text |
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 |
publisher |
Columbia University |
publishDate |
2001 |
url |
https://dx.doi.org/10.7916/d89g5xb6 https://academiccommons.columbia.edu/doi/10.7916/D89G5XB6 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_doi |
https://doi.org/10.7916/d89g5xb6 |
_version_ |
1766016342790504448 |