抄録
This paper reports that a low temperature treatment of rocks may provide an effective and a quick means of “magnetic cleaning”. To demonstrate this, first, the low temperature treatment was carried out on a composite remanent magnetization, namely, IRM (produced at H=12 œ) superposed on TRM (produced at geomagnetic field) of a basalt rock of which major magnetic constituents is titanomagnetite with the Curie point of 510°C. After the basalt was cooled to liquid nitrogen temperature and afterwards heated to room temperature in non-magnetic space, only the TRM component was observed, showing that the IRM component was completely washed off. The same experiment on composite remanent magnetization of IRM (H=100 œ) and NRM of the basalt also showed that the low temperature treatment washed off the IRM.
Finally, it was shown that the low temperature treatment on the NRM's of serpentinite (dispersion factor of the NRM's: k=13.0) improved the convergence of the NRM's with the k value of 25.4.
