NSFGEO-NERC: Transforming understanding of paleomagnetic recording: Insights from experimental observations and numerical predictions

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Our understanding of the way in which rocks record the geomagnetic field is based on an analyticaltheory which makes the assumption that particles are uniformly magnetized (i.e., they are single domain,SD). But, it has long been known that most rocks contain grains referred to as pseudo-single-domain(PSD); these are too big to be uniformly magnetized, and are unsuited for analytical theory.Recent breakthroughs in numerical modeling have opened new avenues for understanding the nature ofPSD grains. Making it possible to estimate the temporal and thermal stability of PSD particles. Thisapproach has gained new urgency given recent results on PSD samples which call into question theirreliability for paleointensity research. The opportunity now exists to combine experimental and numericalapproaches for a radical new understanding of paleomagnetic recording, with the potential to transformhow paleointensity research is done.