Isothermal remanent magnetization of Greenland ice: Preliminary results

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
2001
Editor: 
Journal Title: 
Geophysical Research Letters
Journal Date: 
Apr 15
Place Published: 
Tertiary Title: 
Volume: 
28
Issue: 
8
Pages: 
1639-1642
Section / Start page: 
Publisher: 
ISBN Number: 
0094-8276
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000168066100059
LDEO Publication Number: 
Call Number: 
Abstract: 

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 propel ties which al e consistent with that expected from varying concentrations of magnetite or maghemite, Interstingly, 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 fat.

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421LPTimes Cited:4Cited References Count:16

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