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The discipline based on the study of thermoremanent magnetisation in archaeological materials is called archaeomagnetic dating.
The record so preserved is called a thermoremanent magnetization (TRM).
Thermoremanent magnetization is the form of remanence that gives rise to the magnetic anomalies around ocean ridges.
The magnetization remains in the same state as the rock is cooled to room temperature and becomes a thermoremanent magnetization.
The Lake Mungo results were due to thermoremanent magnetization, ruling out a sedimentological phenomena.
In lava flows, the direction of the field is "frozen" in small magnetic particles as they cool, giving rise to a thermoremanent magnetization.
Furnaces, fireplaces and kilns may have a strong magnetic anomaly because a thermoremanent magnetization has been baked into magnetic minerals.
Thermoremanent magnetization (TRM)
When an igneous rock cools, it acquires a thermoremanent magnetization (TRM) from the Earth's field.
If it is only part of the remanence, it is known as partial thermoremanent magnetization (pTRM).
Néel used his theory to develop a model of thermoremanent magnetization in single-domain ferromagnetic minerals that explained how these minerals could reliably record the geomagnetic field.
Thermoremanent magnetization (TRM) is acquired during cooling through the Curie temperature of the magnetic minerals and is the best source of information on the past Earth's field.
By heating rocks and archeological materials to high temperatures in a magnetic field, they gave the materials a thermoremanent magnetization (TRM), and they investigated the properties of this magnetization.
This is possible because volcanic flows acquire a thermoremanent magnetization and sediments acquire a depositional remanent magnetization, both of which reflect the direction of the Earth's field at the time of formation.
The magnitude of footwall tilting is determined by comparing observed data (either primary thermoremanent magnetizations, TRMs, or high-temperature thermochemical magnetizations, TCRMs, acquired early in the cooling history of the intrusions) with expected, time-averaged directions of similar age.