放散虫化石の研究史からみた美濃帯の地質

This paper describes the outline of study of the Mino Terrane, central Japan, principally fromthe radiolarian biostratigraphic viewpoint. Activiites of the cooperative researches related tomy study such as IGCP-115 (the siliceous deposits of the circum-Pacific region), IGCP-171 (thecircum-Pacific Jurassic), IGCP-224 (Pre-Cretaceous terranes of Japan), Circum Pacific TerraneConferences, are also reported. After the plate tectonic discussions on the orogenic belts werepresented, we were going to discuss the Alaskan geology.I have met Prof. Pessagno in 1967 at the special meeting of IGCP-114 held at Menlo Park,California, and he taught me the fundamental knowledge and techniques on radiolarianpaleontoloty at University of Texas at Dallas in 1968. After leaving USA, I started the extensivestudy of Radiolaria with my colleagues at Nagoya. The first paper reporting the finding ofJurassic radiolarians in the so-called “Paleozoic” areas in central Japan was described by astudent (M. Sakai) in 1979. The results of these studies in the Mino area was orally reportedto Prof. Emeritus Teiichi Kobayashi, who strongly recommended me to write the result and topublish it on the Proceedings of the Japan Academy (Mizutani et al., 1981a).Jones et al. (1977; 1980) and Coney et al. (1980) pointed out the importance of thetectonostratigraphic terrane as exemplified in the geology of West Canada and Alaska. TheWrangellia terrane, the Chulitna terrane, and the Angayuchan terrane are the examples of theterrane in west North America. We have a special meeting in Japan called the Oji Seminar in1981 as an activity of DELP (Dynamics and Evolution of Lithosphere Project), where we organizedthe Circum-Pacific Terrane Conference, which was held thereafter at Sydney in Austraia, and atNanjing in China, and so on.In Japan, IGCP-224 organized by Prof. K. Ichikawa to restudy the geology of the JapaneseIslands based on the radiolarian biostratigraphy, and we published the report entitled the Pre-Cretaceous terranes of Japan.As for the Japanese Islands, Miyashiro (1967) published his idea on the geology of theJapanese Islands based on various aspects of earth sciences such as i) the fundamental knowledgeof metamorphic petrology, ii) the thermodynamic of Al2SiO3 (sillimanite, alulsite and cyanite), iii)classification of metamorphic facies and facies-series, iv) finding two contrasting metamorphismof high-T/low-P and low-T/high-P ones, v) combining the data of deep seismic zone under theJapanese Islands, vi) distribution of Cenozoic volcanoes, vii) geophysical data of whole JapansesIslands, and viii) topological properties of islands and trenches and trough, collaborated withSugimura and Uyeda, which were really a beautifully summarized to understand the geological— 34 —history of our islands. On the other hand, the concept of Heterogen, or the heterogeneousaggregate of the craton and orogenic belts in East Asia, of Kobayashi (1953, 1957) has beenapproved by the Asian geologists, which may be treated from the collage-tectonic point of view.Outline of history of the study on the Japanese Islands suggests the new and global trend tounderstand their geological history. As was discussed at the DELP meeting in Japan, the studiesof geolgic age determination have been stressed to be much more promoted for all the earthscientists, and they gave us additional data for the study of the intra- and inter-terrane relation.As was treated on the basis of the biostratigraphy of the geologic history, we can extend ourdiscussion to the geohistory on the basis of the choronostratigraphy even if there are plutonic andmetamorphic rocks and Precambrian rocks.It will be discussed on the basis of the P-T-t-path of the old terranes in the JapaneseIslands. The complexity of mélange terrane, or ophiolite terrane will be disucussed in detail bybiostratigraphically and choronostratigraphically.In this report I describe the short history of academic exchange program between NagoyaUniversiy of Japan and Nanjing University of China, which have been performed under theleadership of the governmental policy of China and also under program of circum-Pacific terraneproject. In fact, the geology of the Nadanhata terrane in the Heilongjian Province in northeastChinaa has many traits in common with the Mino Terrane in Japan. I published a paper inNagoya Journal of Philosophy (Mizutani, 2013) on the revolution of science, and I reviewed thepaper here, too. Brief history of our studies of the radiolarians in the Mino terrne and in Japan isdescribed here on a basis of many reports published in these fifty years.

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