9:30 AM - 9:45 AM
[MZZ42-03] Geological philosophy and consciousness of Tatsuro Matsumoto (1): His contributions to acceptance of plate tectonics in Japan
Keywords:Matsumoto, Tatusro, plate tectonics, accretion model, historical geology
Matsumoto supervised adoptation of PT at the stratigraphy group of KU. He started to contend with issues of geosyncline at 1964. He organized a research group “Comprehensive studies of geosyncline sediments” from 1967 – 1969. Many young researches attended to it. Achievements of this project were published in two memoirs of the GSJ (Matsumoto, 1968; Matumoto & Kanmera, 1971). Matsumoto (1972) mentioned his espousal of PT and pointed out that PT could not explain the Cretaceous large granitic magmatism in East Asia at that stage. In this year, Matsumoto’s colleagues, Kanmera and Okada, attended an international symposium of geosynclinals processes at Madison. Takashi Sakai was given an assignment “review of global orogenic belts” from Matsumoto when he enrolled into the graduate school of KU at 1974. Sakai and Kanmera started to present researches of the Nichinan Group in the Shimanto Belt at 1975, which escalated developments of the accretion theory in Japan.
Japanese geologists other than Matsumoto tended to assume a tectonic force from the Eurasian continent when they explained tectonic evolution of Japan. The introduction of accretion model to the Shimanto was also a paradigm shift of the tectonic agent from the continent to the ocean. Matsumoto had proposed the Tsuhima-Goto fault in 1940’s as a tectonic domain boundary between Japan and main Eurasian continent based on the research of Tushima (Matsumoto, 1969). Matsumoto (1961) pointed out the straight line configuration of the Hokusatu bend, the twill-weave disturbance of Nichinan and the northwestern margin of the Shikoku Basin around Kyusu. He also suggested that the Shikoku Basin would have been formed in the early to middle Miocene. These insights of Matsumoto were bases of the adoptation of PT at KU. KU adopted PT not as a trendy a prior model but a posteriori model which can explain geological features of Kyushu. Matsumoto therefore was the driving force of adoptation of PT in Japan at the initial stage.