Abstract
The stable carriers of the palaeomagnetic record in rocks are commonly fine grains of magnetite or titanomagnetite (Fe3–xTixO4) between 1 and 15 µm in diameter. The magnetic properties of these particles are therefore of interest to palaeomagnetists who must rely on them to preserve the Earth's magnetic field record over geological time. We report here domain observations of titanomagnetites in samples from Leg 49 of the Deep Sea Drilling Project. The results indicate that a major contributor to ‘pseudosingle-domain’ (PSD) saturation remanence is single domain remanence of particles larger than the classical single-domain threshold size which fail to nucleate domain walls in this magnetization state.
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