What is magnetic dating

23 Jan

The Earth's magnetic core is generally inclined at an 11 degree angle from the Earth's axis of rotation.Therefore, the magnetic north pole is at approximately an 11 degree angle from the geographic north pole.This series of dated positions is known as the "archaeomagnetic reference curve." (Stacey Lengyel, 2010. 81–3090.) So how do scientists use the earth's wandering magnetic field to date archaeological sites? Certain clays have a naturally high iron (Fe) content.The direction and magnitude of the magnetic field of the Earth at a particular location varies with time, and can be used to constrain the age of materials.In conjunction with techniques such as radiometric dating, the technique can be used to construct and calibrate the geomagnetic polarity time scale.

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Superheating rock or clay (hotter than firing a prehistoric ceramic) aligns the iron mineral within the material to the current magnetic north pole. 1993 A methodological approach for identifying archaeological evidence of fire resulting from human activities.

Archaeomagnetic dating is the study and interpretation of the signatures of the Earth's magnetic field at past times recorded in archaeological materials.

These paleomagnetic signatures are fixed when ferromagnetic materials such as magnetite cool below the Curie point, freezing the magnetic moment of the material in the direction of the local magnetic field at that time.

Such materials are repelled by outside magnetic forces because of eddy currents that form in their magnetic field.

The best diamagnets are superconductors, which resist a magnetic field while transforming into a superconducting state, as explained by the Meissner effect.