Abstract

Magnetic interaction between different constituents in each grains of ferromagnetic minerals in rocks is studied with the aid of X-ray, microscopic and chemical analyses as well as magnetic measurements. Since by means of suitable heat-treatments the degree of intergrowth of a constituent into others in mineral grains is changed markedly, the resultant magnetic interaction between these constituents is also changed appreciably. It is proved as the result of general study that the anomalous increase in thermo-remanent magnetization of ferromagnetic minerals is due to magnetic coupling of a constituent having a higher Curie-point with other one having a lower Curie-point.

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