Archaeomagnetism dating definition
The samples are sent to an Archaeomagnetic Laboratory for processing. In general, many cultures used long-term fire hearths made of clay bricks, or a space lined with clay, that were baked into place by use. These artifacts of occupation can yield the magnetic declination from the last time they were fired or used. The Archaeomagnetic Laboratory at the Illinois State Museum has secular variation curves for the southwest, mid-continent and southeast United States.
This involves sufficient mass to take samples from, and a suitable material with adequate magnetite to hold the remnant magnetism. Each of the samples is measured in a spinner magnetometer to determine the thermal remanent magnetism of each sample. Within these weaker areas the local directions and intensities change gradually secular variation. These samples are marked for true north at the time of collection.
Data from this feature is compared to the regional secular variation curve in order to determine the best-fit date range for the feature's last firing event. Southwest Archaeomagnetic Reference Curve. The magnetic declination at any given time can be frozen into a clay formation that contains magnetite and is heated above the Curie point.
Archaeomagnetism - definition of archaeomagnetism by The Free Dictionary
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