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Thermal fluctuation fields in basalts

机译：玄武岩中的热涨落场

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The thermal fluctuation field (Hf) is central to thermoremanent acquisition models, which are key to our understanding of the reliability of palaeomagnetic data, however, Hf is poorly quantified for natural systems. We report Hf determinations for a range of basalts, made by measuring rate-dependent hysteresis. The results for the basalts were found to be generally consistent within the space of Hf versus the coercive force HC, i.e., the "Barbier plot", which is characterized by the empirically derived relationship; log Hf ∝ 1.3 log HC obtained from measurements on a wide range of different magnetic materials. Although the basalts appear to occupy the correct position within the space of the Barbier plot, the relationship within the sample set, log Hf ∝ 0.54 log HC, is different to the Barbier relationship. This difference is attributed to the original Barbier relationship being derived from a wide range of different synthetic magnetic materials, and not for variations within one material type, as well as differences in methodology in determining Hf. We consider the relationship between Hc and the activation volume, vact, which was found to be Hc ∝ vact-0.68 for our mineralogically homogeneous samples. This compares favourably with theoretical predictions, and with previous empirical estimates based on the Barbier plot, which defined the relationship as Hc ∝ vact-0.73.
机译：热波动场（Hf）是热剩余采集模型的核心，这是我们了解古磁数据可靠性的关键，但是，对于自然系统，Hf量化较差。我们报告了通过测量速率相关的磁滞来确定一系列玄武岩的Hf值。发现玄武岩的结果在Hf相对于HC矫顽力HC的空间内通常是一致的，即“ Barbier图”，其特征是根据经验得出的关系; log Hf ∝ 1.3 log HC由对各种不同磁性材料的测量获得。尽管玄武岩似乎在Barbier图的空间中占据了正确的位置，但样本集中的关系（log Hf ∝ 0.54 log HC）与Barbier关系不同。该差异归因于原始的Barbier关系，该关系源自多种不同的合成磁性材料，而不是由于一种材料类型内的变化以及确定Hf的方法差异。我们考虑了Hc与活化体积vact之间的关系，对于我们的矿物均匀样品，发现其为Hc ∝ vact-0.68。这与理论预测以及基于Barbier图的先前经验估计相吻合，后者将关系定义为Hc vact-0.73。

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