Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..105l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 1-2, p. 105-112.
Physics
4
Scientific paper
The relationship between magnetic moment and grain geometry of pseudo-single-domain (PSD) natural magnetite has been investigated by acquisition of post-stirring detrital remanent magnetization (DRM) of magnetite grains dispersed in a slowly curing epoxy resin (Araldite). The geometry of the magnetite grains is inferred from the shape of the anisotropy of magnetic susceptibility (AMS) ellipsoids, as well as from scanning electron microscopy (SEM) counting. Magnetic moments of ball-milled polycrystalline natural magnetite grains are initially not parallel to the longest dimension of the grains, but by increasing the magnetic grain moments (IRM acquisition), they become parallel to the long axes of grains. Magnetic lineations and anisotropies reach `saturation' values in fields just above the remanent acquisition coercive force, suggesting that grain alignment is controlled by the induced magnetization parallel to the longest grain dimension, i.e. the easy magnetization direction. These observations imply that the origin of both DRM and AMS may be accounted for by one population of magnetite grains. Also, the inclination error may represent an intrinsic property of some sediments; hence corrections for this error are not valid. Ratios of longest to shortest grain dimensions (l/d) inferred from AMS are around 1.25-1.35, and direct SEM counting of polished grains yields a peak around 1.5-2.0.
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