Peaked thermomagnetic curves for hematite-bearing rocks and concentrates |
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| Authors: | BA Duff |
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| Institution: | Department of Earth Sciences, University of Leeds, Leeds LS2 9JT Great Britain |
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| Abstract: | Hematite-bearing rocks commonly have thermomagnetic curves with pronounced peaks in magnetization at temperatures which vary between samples. These peaks and their variability were reproduced for a sample of nearly-pure hematite in a series of different applied fields. With increasing applied field the peak sharpness became less marked and the “peak temperature” decreased. These results are similar to those obtained by Day (1975) for synthetic titanomagnetite powders, and a similar interpretation is proposed. Most laboratory fields are insufficient to saturate hematite, and the unsaturated magnetization increases and is unblocked and aligned with the field at temperatures critically dependent on the hysteretic properties of the sample. The natural tendency for magnetization to decay with increasing temperature then produces the observed peak. |
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