Авторы: Michael Volk, Joshua Feinberg

2019 г.

GGG

   Pressure remanent magnetization (PRM) is acquired when a rock is compressed in the presence of a magnetic eld. This process can take place in many di erent 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 di erent pressures and temperatures, using synthetic magnetite in four di erent grain sizes ranging from nearly single-domain to purely multi-domain. The magnitude of the PRM acquired in a 300 microTESLA 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 multi-domain grains can be quite ecient, and may represent a signi cant component of magnetization in low-temperature { high-pressure environments.

Файл: 1036.pdf