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We newly obtained 38 K-Ar dates for the Tanzawa tonalite and related rocks. The dates for hornblendes in the tonalite as well as that for hornfels adjacent to it indicate that the Tanzawa pluton was formed about 7Ma. Widely distributed 4-5Ma age for biotite could be interpreted as a rapid cooling of the body that started at this time. An 40Ar/39Ar age study suggests that ages older than 10Ma, which were obtained for samples collected in the southwestern part of the body, are due to excess argon in the samples.

K-Ar Dating of the Tanzawa Tonalitic Body and Some Restrictions on the Collision Tectonics in the South Fossa Magna, Central Japan.