The anisotropy of magnetic susceptibility and paleomagnetic direction of the Tanzawa tonalite and related rocks are studied in order to throw light on the emplacement mechanism of tonalite magma. The paleomagnetic directions of samples from syn-plutonic dikes in the Tanzawa main tonalite and dikes in the Jizodaira intrusion reveal that the mass of Tanzawa tonalite did not tilt greatly since its emplacement at Ma. The Tanzawa
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