Ice magnetization in the EPICA-Dome C ice core: implication for dust sources during glacial and interglacial periods.

Isothermal remanent magnetization and insoluble dust content of ice samples from EPICA-Dome C ice core were measured to characterize the magnetic properties of atmospheric dust. Despite the larger concentration of dust aerosol during glacial stages, the magnetization of the dust fraction was found t...

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Bibliographic Details
Published in:Journal of Geophysical Research
Main Authors: Lanci, L, Delmonte, B, Maggi, V, Petit, JR, Kent, DV
Other Authors: Petit, J, Kent, D
Format: Article in Journal/Newspaper
Language:English
Published: Wiley-Blackwell Publishing, Inc. 2008
Subjects:
Magnetization
ice cores
dust
paleoclimate
GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA
GEO/02 - GEOLOGIA STRATIGRAFICA E SEDIMENTOLOGICA
EPICA
ice core
Online Access:http://hdl.handle.net/10281/9046
https://doi.org/10.1029/2007JD009678
Description
Summary:Isothermal remanent magnetization and insoluble dust content of ice samples from EPICA-Dome C ice core were measured to characterize the magnetic properties of atmospheric dust. Despite the larger concentration of dust aerosol during glacial stages, the magnetization of the dust fraction was found to be higher during interglacials and exhibits a larger variability. Changes in magnetic mineralogy of aerosol dust in ice from different climatic stages were also characterized using coercivity of remanence. Variations of magnetic properties of dust from glacial to interglacial stages indicate changes in dust provenance, in agreement with previous results based on geochemical analysis. However, the extremely large magnetizations of some interglacial samples also suggest that episodical eolian deposition from highly magnetic deposits occurred during interglacial periods.

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