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

我们对岩石记录地磁场的方式的理解是基于一种分析理论，该理论假设粒子是均匀磁化的（即，它们是单畴的，SD）。但是，人们早就知道，大多数岩石含有被称为伪单畴（PSD）的颗粒；它们太大了，不能均匀磁化，也不适合分析理论。数值模拟的最新突破为理解psd颗粒的性质开辟了新的途径。使估计PSD粒子的时间和热稳定性成为可能。鉴于最近对PSD样品的结果，这种方法获得了新的紧迫性，这些结果对它们在古强度研究中的可靠性提出了质疑。现在有机会将实验和数值方法结合起来，对古地磁记录有一个全新的认识，有可能改变古地磁强度研究的方式。

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.