The intensity of the geomagnetic field at 3.5 Ga - Paleointensity results from the Komati Formation, Barberton Mountain Land, South Africa

Mathematics – Logic

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Earth Core, Geomagnetism, Minerals, Magnetic Properties, Republic Of South Africa

Scientific paper

A single, steeply-directed negative thermal remanent magnetization component acquired during the metamorphism of the Komati lavas is noted in paleointensity measurements of 3.5 Ga samples from the Komati Formation-type locality, on the basis of both Van Zijl and Tellier methods. Since the Komati characteristic remanence was aquired during a slow cooling, the data must be reduced by a factor of 1.55 to account for the difference between natural and laboratory cooling rates; calculation of an equivalent equatorial paleointensity using the paleolatitude implicit in the steep Komati characteristic remanence then yields a value of 5 microT for the geomagnetic field intensity at 3.5 Ga, by contrast to the present 30 microT value.

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