Domain State and Temperature Dependence of Pressure Remanent Magnetization in Synthetic Magnetite: Implications for Crustal Remagnetization
Domain State and Temperature Dependence of Pressure Remanent Magnetization in Synthetic Magnetite: Implications for Crustal Remagnetization
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DOI：
10.1029/2019gc008238
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发表时间：
2019-05
期刊：
影响因子：
3.7
通讯作者：
M. Volk;J. Feinberg
中科院分区：
文献类型：
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作者：
M. Volk;J. Feinberg
当岩石在磁场中被压缩时，就会获得压力剩磁 (PRM)。这个过程可以在许多不同的环境中发生，从太空中的撞击和弹射过程，到陆地岩石的埋藏和随后的隆起。在这项研究中，我们系统地研究了在不同压力和温度下获取 PRM，使用四种不同粒度的合成磁铁矿，从近单域到纯多域。在 300 μT 场中采集的 PRM 幅度在误差范围内与样品的域状态无关。我们认为 PRM 的获得主要是由磁性材料的磁致伸缩驱动的。我们进一步表明，与热剩磁相比，在大型多域晶粒中获取 PRM 可以非常有效，并且可能代表低温高压环境中磁化的重要组成部分。
Pressure remanent magnetization (PRM) is acquired when a rock is compressed in the presence of a magnetic field. This process can take place in many different environments from impact and ejection processes in space, to burial and subsequent uplifting of terrestrial rocks. In this study, we systematically study the acquisition of PRM at different pressures and temperatures, using synthetic magnetite in four different grain sizes ranging from nearly single‐domain to purely multidomain. The magnitude of the PRM acquired in a 300 μT field is, within error, independent of the domain state of the sample. We propose that the acquisition of a PRM is mainly driven by the magnetostriction of the magnetic material. We further show that compared to a thermal remanent magnetization, the acquisition of PRM in large multidomain grains can be quite efficient, and may represent a significant component of magnetization in low‐temperature–high‐pressure environments.