Abstract
Sericite was separated from stibnite-quartz-carbonate-clay veins at Tozawa mine occurring in so-called Inagawa-type granite of the Ryoke metamorphic belt, and was examined by K-Ar method. The obtained age was 61.6±1.6 Ma, which is younger than the age of the host Inagawa Granite, but is close to the age of the Naegi granite of the Sanyo Belt, implying the stibnite deposits formed as the products of the post granitic hydrothermal activity of the Naegi granite.
