EFFECTS OF SEDIMENT AGGREGATE SIZE ON DRM INTENSITY: A NEW THEORY
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dc.contributor.author | Katari K. | |
dc.contributor.author | Bloxham J. | |
dc.date.accessioned | 2021-02-12T04:05:04Z | |
dc.date.available | 2021-02-12T04:05:04Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=599047 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2001, 186, 1, 113-122 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/24769 | |
dc.description.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. | |
dc.subject | DEPOSITIONAL REMANENT MAGNETIZATION | |
dc.subject | MAGNETIC INTENSITY | |
dc.subject | FLOCCULATION | |
dc.subject | SEDIMENTS | |
dc.subject | NONMAGNETIC MINERALS | |
dc.title | EFFECTS OF SEDIMENT AGGREGATE SIZE ON DRM INTENSITY: A NEW THEORY | |
dc.type | Статья |
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