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- W2071717745 abstract "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." @default.
- W2071717745 created "2016-06-24" @default.
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- W2071717745 date "2001-03-01" @default.
- W2071717745 modified "2023-10-18" @default.
- W2071717745 title "Effects of sediment aggregate size on DRM intensity: a new theory" @default.
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- W2071717745 doi "https://doi.org/10.1016/s0012-821x(00)00386-1" @default.
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