Abstract
In 1961 Miyashiro presented the concept of paired metamorphic belts based on the mode of occurrences of high-pressure metamorphic belts along the Circum-Pacific orogenic belts, particularly in Japan. According to him the Japanese islands are composed essentially of three paired metamorphic belts: the late Paleozoic Hida-Sangun and late Mesozoic Ryoke-Sanbagawa pairs in Honshu, and the late Mesozoic Kamuikotan Hidaka in Hokkaido. At that time he could use only 11 K-Ar mica ages. Detailed petrographic work has continued since that time, and many radiometric ages are now available in the literature. From the late 1970s to the early 1980s, two major breakthroughs were made in Japanese basement geology; the first was in conodont-biostratigraphy followed by radiolaria-biostratigraphy, and the second was due to the increased pro ductivity ofK-Ar dating. Finally, the geosyncline concept was abandoned, and has been replaced by plate-tectonics approaches for explaining why particular metamorphic belts are located where they are today. Uyeda & Miyashiro (1974), Saito & Hashimoto (1982), and Maruyama & Seno (1986) pioneered this research. These and later works revealed that many metamorphic areas actually consist of several units.
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