| The remanence inclination, I, of magnetite-bearing sediment can be shallower than the inclination of the Earth's magnetic field, IH, at the time of deposition due to burial compaction. Compaction also induces a magnetic anisotropy which can be used to correct for inclination shallowing. Theory predicts an approximately linear relation between tanI/tanIH and the sediment's remanence anisotropy parameter ARMmin/ARMmax (the ratio of intensities of anhysteretic remanence given identically perpendicular and parallel to the bedding plane of the sediment). The slope of this line depends on the average remanence anisotropy parameter of the sediment's magnetite particles, ARM⊥/ARM∥, (the ratio of intensities of anhysteretic remanence applied identically perpendicular and parallel to the long axes of the magnetite grains). For a suite of clay-rich magnetite-bearing sediments, we estimate ARM⊥/ARM∥, by making a composite sample, giving it an inclined anhysteretic remanence and then applying a uniaxial compression and observing the change in remanence inclination and ARM min/ARMmax. (Abstract shortened by UMI.)... |
