J . Japan. Assoc. Petr. Econ. 78, 11-20, Min. Geol. 1983 K-Ar ages of Sangun metamorphic rocks...rocks in Yamaguchi Prefecture and their geologic significance YUJIRO NISHIMURA Institute of Earth Sciences...Sciences, Faculty of Liberal Arts , Yamaguchi University, Yamaguchi 753, Japan. Eizo Department NAKAMURA of...Mineralogy, Faculty of Science, Hiroshima Hiroshima 730, Japan. University, K-Ar ages have been determined on...in the Nishiki-cho and Toyoga-dake areas, Yamaguchi Prefecture. The dates from the Nishiki-cho area are |