237 research outputs found
Paleolimnological studies
No full textBook chapterKumon, Fujio. “Paleolimnological studies”. Lake Kizaki: Limnology and Ecology of a Japanese Lake. Saijo, Y. and Hayashi, H. Backhuys Publishers, 1981, p. 55-62.boo
Paleolimnological studies
No full textBook chapterapplication/pdfKumon, Fujio. “Paleolimnological studies”. Lake Kizaki: Limnology and Ecology of a Japanese Lake. Saijo, Y. and Hayashi, H. Backhuys Publishers, 1981, p. 55-62.boo
Modal and chemical compositions of the representative sandstones from the Japanese Islands and their tectonic implications
No full textArticleKumon, Fujio; Kiminami, Kazuo. “Modal and chemical compositions of the representative sandstones from the Japanese Islands and their tectonic implications”. Proceedings of the 29th International Geological Congress: Part A. Kyoto, Japan, 1992-08-24/09-03, VSP, 2004, p. 135-151.conference pape
Modal and chemical compositions of the representative sandstones from the Japanese Islands and their tectonic implications
No full textArticleapplication/pdfKumon, Fujio; Kiminami, Kazuo. “Modal and chemical compositions of the representative sandstones from the Japanese Islands and their tectonic implications”. Proceedings of the 29th International Geological Congress: Part A. Kyoto, Japan, 1992-08-24/09-03, VSP, 2004, p. 135-151.articl
STRATIGRAPHIC CHANGE OF THE COARSE CLASTIC ROCKS OF THE SHIMANTO SUPERGROUP IN EASTERN, SHIKOKU, SOUTHWEST JAPAN
No full textThe Shimanto Supergroup of geosynclinal facies which ranges from Cretaceous to early Tertiary in age, is widely distributed in the outermost zone of Southwest Japan. Coeval volcanic and plutonic rocks are extensively distributed in the Inner Zone. The coarse clastic rocks mainly of sandstone occupy about a half of the Shimanto Supergroup, and a stratigraphic change of sandstone and conglomerate composition is recognized in the supergroup. The amount of rock fragments, chiefly acidic to intermediate volcanic rocks, increases upward throughout the Cretaceous sequence. Additionally, acidic tuff layers are frequently intercalated in the Late Cretaceous sequence. Conglomerates in the Late Cretaceous are very dominated by acidic volcanic rock clasts. The geosynclinal sedimentation of the Cretaceous Shimanto Supergroup proceeded with the coeval volcanism which became more active in the Late Cretaceous. The clastic sediments were supplied mainly from the sites of the volcanism. The volcanism corresponds to the Cretaceous volcanic activity in the Inner Zone of Southwest Japan. The Cretaceous Shimanto Supergroup may represent a typical forearc sedimentation in an arc-trench system.Book chapterapplication/pdfKumon, Fujio. “STRATIGRAPHIC CHANGE OF THE COARSE CLASTIC ROCKS OF THE SHIMANTO SUPERGROUP IN EASTERN, SHIKOKU, SOUTHWEST JAPAN”. Formation of Active Ocean Margins. Nasu, N. Terra Scientific Publishing Company, 1986, p. 819-833.boo
Millennial-scale variability in vegetation records from the East Asian Islands: Taiwan, Japan and Sakhalin
No full textCoarse Clastic Rocks of the Shimanto Supergroup in Eastern Shikoku and Kii Peninsula, Southwest Japan
No full textThe stratigraphy and correlation of the Cretaceous strata in eastern Shikoku and Kii Peninsula are examined based on the radiolarian biostratigraphy. As the results, the stratigraphic change of the sandstone composition was recognized. The sandstones of the late Early Cretaceous are rich in feldspar, especially of plagioclase, and poor in rock fragments. Most sandstones of the Late Cretaceous are dominant in rock fragments, especially of acidic to intermediate volcanic rocks. Most of the Paleogene sandstones are characterized by very dominant quartz and poor rock fragments. Such stratigraphic change is also supported by the change of conglomerate composition. It reflects the change of the provenance nature. The increasing trend of rock fragments consisting mainly of volcanic rocks in the Cretaceous sequences indicates that the volcanism of acidic to intermediate nature took place in the provenance to the north of the basin contemporaneously with the sedimentation of the Late Cretaceous Shimanto Supergroup, and provided a large amount of volcanic materials to the basin. This volcanism corresponds to the so-called late Mesozoic Igneous Activity in the Inner Zone of Southwest Japan. Thus, the Late Cretaceous Shimanto Supergroup represents one type of the forearc sedimentation in magmatic arc-trench system. The difference of clastic composition between the Cretaceous and the Paleogene is explained by the unroofing process of the Cretaceous magmatic terrane. Lastly, the geotectonic development of the Shimanto Belt and its provenance is discussed mainly based on the sedimentological analyses. The marginal sea setting similar to the present Philippine Sea is considered to be preferable for the Shimanto geosyncline
STRATIGRAPHIC CHANGE OF THE COARSE CLASTIC ROCKS OF THE SHIMANTO SUPERGROUP IN EASTERN, SHIKOKU, SOUTHWEST JAPAN
No full textThe Shimanto Supergroup of geosynclinal facies which ranges from Cretaceous to early Tertiary in age, is widely distributed in the outermost zone of Southwest Japan. Coeval volcanic and plutonic rocks are extensively distributed in the Inner Zone. The coarse clastic rocks mainly of sandstone occupy about a half of the Shimanto Supergroup, and a stratigraphic change of sandstone and conglomerate composition is recognized in the supergroup. The amount of rock fragments, chiefly acidic to intermediate volcanic rocks, increases upward throughout the Cretaceous sequence. Additionally, acidic tuff layers are frequently intercalated in the Late Cretaceous sequence. Conglomerates in the Late Cretaceous are very dominated by acidic volcanic rock clasts. The geosynclinal sedimentation of the Cretaceous Shimanto Supergroup proceeded with the coeval volcanism which became more active in the Late Cretaceous. The clastic sediments were supplied mainly from the sites of the volcanism. The volcanism corresponds to the Cretaceous volcanic activity in the Inner Zone of Southwest Japan. The Cretaceous Shimanto Supergroup may represent a typical forearc sedimentation in an arc-trench system
Debrisflow and other disasters occurred in September, 1976, in Shodoshima Island, Japan
No full textSevere water disaster was occurred again in the Shodoshima Island on 8〜13th September 1976. 39 peoples were killed and more than 400 houses were badly damaged. As reported by IKEDA and others (1977), such a disaster had been occurred about two years before it, in the eastern part of the island. The calamity was brought on the people mainly by the attacks of debris flows caused by falls of mass of grus from the mountains. It is noteworthy that not few of the falls of grus were closely related with human agency. For example, many falls happened from the road which lead to the second-house quarters "Villa Shodoshima" and grew into debris flows that attacked the houses. In another case, many shallow-type landslides were occurred on the mountains burnt out in a fire 8 years before the disaster. As was stressed by IKEDA and others (1977), fundamental and the most serious problem is the recent increase of houses and development of residental quarters. Nowadays, many peoples live unavoidably on dangerous places such as active alluvial fan, foot of steep slope of deeply weathered mountains, etc. In Kobe city, water disaster, caused by similar circumstances of dwelling, already occurred in 1938. Such disasters might increase still more in Japan
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