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The behaviour and detection of partial thermoremanent magnetisation (PTRM) tails in Thellier palaeointensity experiments

机译:Thellier古强度实验中部分热剩磁(PTRM)尾部的行为和检测

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摘要

We analyse the results of Thellier palaeointensity experiments modified so that the measured magnetisation at any, stage may be decomposed into components of natural remanent magnetisation (NRM) and laboratory thermal remanent magnetisation (TRM). We demonstrate that the very long high temperature tails of pTRM acquired by multidomain (MD) grains may be detected in Thellier experiments without recourse to explicit pTRM tail check measurements. This can save time in the experimental process and provides a more sensitive indication of how MD behaviour may affect that particular experiment than either pTRM tail checks or the observation of zigzagging in an IZZI experiment. We observe that the action of imparting a pTRM tail also involves some removal of NRM. However, the pTRM tails are not the analogues of classical overprints as may be intuitively expected but instead appear to favour remagnetisation over demagnetisation. This and other observed behaviour is not consistent with any phenomenological model of MD TRM but is consistent with predictions made by kinematic theory.
机译:我们分析了修改过的塞勒古强度实验的结果,以便在任何阶段测得的磁化强度都可以分解为自然剩磁强度(NRM)和实验室热剩磁强度(TRM)的组成部分。我们证明,在塞勒实验中可以检测到由多域(MD)晶粒获得的非常长的pTRM高温尾巴,而无需借助明确的pTRM尾巴检查测量。与pTRM尾部检查或IZZI实验中的锯齿形观察相比,这可以节省实验过程的时间,并提供更敏感的指示MD行为如何影响特定实验的指示。我们观察到赋予pTRM尾巴的作用也涉及NRM的去除。但是,pTRM尾部不是可以像直觉上预期的那样经典叠印的类似物,而是看起来倾向于磁化而不是消磁。这种和其他观察到的行为与MD TRM的任何现象学模型不一致,但与运动学理论所做的预测一致。

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