Archeomagnetic and paleomagnetic dating
In 1797, Von Humboldt attributed this magnetization to lightning strikes (and lightning strikes do often magnetize surface rocks).
In the 19th century studies of the direction of magnetization in rocks showed that some recent lavas were magnetized parallel to the Earth's magnetic field. Blackett provided a major impetus to paleomagnetism by inventing a sensitive astatic magnetometer in 1956.
Certain minerals in rocks lock-in a record of the direction and intensity of the magnetic field when they form.
This record provides information on the past behavior of Earth's magnetic field and the past location of tectonic plates.
Among a total of 90 samples from hearths remains of six dwelling sites, the characteristic remanent magnetization components were isolated from 70 samples using the progressive alternating field demagnetizations and considered to record faithfully a thermoremanent magnetization at the timing of the last cooling of the hearths.
Paleomagnetism relied heavily on new developments in rock magnetism, which in turn has provided the foundation for new applications of magnetism.
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An archeomagnetic study has been performed for six archeological relics of the Proto-Three Kingdoms period excavated in Jungdo Island, South Korea.
The other method adopts a Matlab tool using a Bayesian statistics with global geomagnetic field prediction model (ARCH3K.1).
Both archeomagnetic ages using two individual dating methods generally overlapped with the radiocarbon age ranges for each sites.