Estimating the Effect of Cooling Rate on the Acquisition of Magnetic Remanence

Estimating the Effect of Cooling Rate on the Acquisition of Magnetic Remanence
复制标题

估计冷却速率对获取剩磁的影响

DOI:
10.1029/2021gl095284
复制
发表时间:
2021
影响因子:
5.2
通讯作者:
Nagy L
Nagy L
中科院分区:
地球科学1区
文献类型:
--
作者:
Nagy L

文献摘要

参考文献

相似文献

在估算古磁场强度时,必须考虑冷却速率对岩石磁化强度的影响。计算这种效应并不简单,即使是对于均匀磁化的颗粒。在这里,我们提出了一个开源软件包来计算不同温度和磁场下单轴单畴晶粒的行为。我们重新审视了作为冷却速率函数的热剩磁获取问题,发现我们的预测与Halgedahl等人(1980,https://doi.org/10.1029/jb085ib07p03690)的预测大致一致,但与Dodson和McClelland-Brown(1980,https://doi.org/10.1029/JB085iB05p02625)的预测有显著差异。我们还发现,剩磁采集曲线符合最近的实验观察。使用我们的模型进行的冷却速率校正处于Halgedahl等人(1980,https://doi.org/10.1029/jb085ib07p03690)建议的上限,但对于较大的(单畴)晶粒,原始热剩磁的冷却速率非常慢,场强很大,可以稍微降低。
The effect of cooling rate on the magnetization of rocks must be accounted for when estimating ancient magnetic field strengths. Calculating this effect is not trivial, even for uniformly magnetized grains. Here, we present an open‐source package to compute the behavior of uniaxial single‐domain grains for different temperature and magnetic fields. We revisit the problem of thermal remanence acquisition as a function of cooling rate and find that our predictions are broadly in agreement with those of Halgedahl et al. (1980, https://doi.org/10.1029/jb085ib07p03690) but differ significantly from those of Dodson and McClelland‐Brown (1980, https://doi.org/10.1029/JB085iB05p02625). We also find that remanence acquisition curves correspond well with recent experimental observations. Cooling rate corrections made using our model are at the upper limit suggested by Halgedahl et al. (1980, https://doi.org/10.1029/jb085ib07p03690) but can reduce slightly for larger (single‐domain) grains, very slow cooling rates of the original thermal remanence and large field strengths.
DOI: 10.1093/gji/ggy285
发表时间: 2017
影响因子: 2.8
作者:
K. Fabian;V. Shcherbakov
通讯作者: V. Shcherbakov
DOI: 10.1093/gji/ggt078
发表时间: 2013-06-01
影响因子: 2.8
作者:
Biggin, A. J.;Badejo, S.;Dekkers, M. J.
通讯作者: Dekkers, M. J.
DOI: --
发表时间: 2006
期刊: Earth and Planetary Science Letters 243
影响因子: --
作者:
R.Leonhardt;J.Matzka;A.R.L.Nichols;D.B.Dingwell
通讯作者: D.B.Dingwell