Mathematics – Logic
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.186..113k&link_type=abstract
Earth and Planetary Science Letters, Volume 186, Issue 1, p. 113-122.
Mathematics
Logic
14
Scientific paper
Previously, the acquisition of depositional remanent magnetism (DRM) in redeposition experiments has been described as a balance between the alignment of magnetic moments by the imposed magnetic field and the misaligning effects of Brownian motion, an approach that ignores interactions between sediment particles. Inter-particle attractions due to electrostatic or van der Waals forces, or biologically mediated flocculation, lead to the formation of aggregates, which prevent the settling of individual grains. We propose a new model in which we examine the angular momentum balance on a clay-magnetite aggregate, which can be tens of micrometers in diameter, as opposed to an individual grain of single-domain magnetite, which is usually less than 1 μm in diameter. Viscous drag becomes important for these large aggregates and larger magnetic fields are necessary to bring their moments into alignment. We model the acquisition of DRM by assuming a log-normal size distribution of flocs, all of which have the same magnetic moment. The under-saturation of magnetic intensity in laboratory DRM experiments is explained by the larger viscous drag encountered by the larger aggregates which prevents perfect alignment with the applied magnetic field.
Bloxham Jeremy
Katari K.
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