Thermoremanent magnetisation (TRM)
Definition
Magnetic alignment locked into iron-bearing minerals as they cool through the Curie temperature after being heated. Burning soil can transform weakly magnetic iron oxides into more strongly magnetic magnetite or maghemite, enhancing susceptibility.
Related terms
- Electrical resistivity tomography (ERT)
- A method using multiple electrodes on a line or grid to inject current and measure voltage, computing a two-dimensional or three-dimensional resistivity...
- EM conductivity (frequency-domain EM)
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- Fluxgate gradiometer
- An instrument that measures the vertical gradient of the Earth's magnetic field using two fluxgate sensors mounted on a staff at fixed...
- Magnetic susceptibility
- A measure of how strongly a material is magnetised by an external field. Topsoil heated by fire or biological activity has elevated...
- Wenner array
- A four-electrode resistivity configuration where all four electrodes are equally spaced. Depth of investigation is approximately equal to the electrode spacing. Provides...
Explained in
- Magnetometry and Soil Magnetic SusceptibilityMagnetic alignment locked into iron-bearing minerals as they cool through the Curie temperature after being heated. Burning soil can transform weakly magnetic...