抄録
By separating the test sample of Haruna pumice at 300°C, the ferromagnetic mineral grains showing self-reversal of thermo-remanent magnetism (Reverse T. R. M.) (1) were classified into three types A, AB and B. The measurement of Js-T curve and T. R. M. characteristics of each type revealed that the sole component responsible for Reverse T. R. M. is the grains AB, each of which containing both of the constituents of types A and B in itself. It was concluded that the appearance of Reverse T. R. M. is a result of magnetic interaction between magnetic domains of the constituents A and B in the grains of type AB during cooling under a weak magnetic field.
