Earth Science (Chikyu Kagaku)
Online ISSN : 2189-7212
Print ISSN : 0366-6611
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Volume 1961, Issue 56
Displaying 1-7 of 7 articles from this issue
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  • Land Slide in Ina Valley
    Yosuke KAWACHI, Naotoshi YAMADA
    Article type: Article
    1961 Volume 1961 Issue 56 Pages I-II
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_I
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  • NOTES ON JAPANESE MIDDLE DEVONIAN
    Tadao KAMEI
    Article type: Article
    1961 Volume 1961 Issue 56 Pages 1-10
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_1
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    The fossils of the Fukuji limestone formation have been lately reexamined and the former view about the age of this formation is now revised. Since the earliest record of SUGIYAMA (1941) on the finding of Favosites asper D'ORBIGNY from this formation, very diverse views have been held on this formation regarding the geological age among the Japanese paleontologists. The author is, however, now in the belief that this group of limestone may be correlative with the Middle Devonian in age, especially in its lower half. The lithologic nature, volcanic facies, tectonic and biofacies of the Japanese Middle Devonian are also briefly outlined. Further their similarity or distinction to the Devonian developing in the adjacent continents are stated in a very concise form.
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  • The Yatsugatake Volcanic Chain
    Shimpei KAWACHI
    Article type: Article
    1961 Volume 1961 Issue 56 Pages 11-17
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_11
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    The author intended in the present paper to describe the history of development of the Yatsugatake Volcanic chain, situated in Central Japan. He considered on the following two main problems. (1) The problem of tectonic significance of the stratovolcano. The volcanoes are characterized by the existence of remarkable faults which cut the top parts of the volcanic ranges. Between these faults older volcanic rocks are exposed on a large scale. They are rich in rock facies and special joint systems. Pyritization of rocks are noticed even in the field, and also chloritization, carbonitization and recrystallization under the microscope. These features resemble to those of the adjacent Tertiary volcanic rocks. (2) The problem of relation between the volcano-tectonics and the rock facies since Pliocene. The area including this volcanic chain and the Pliocene volcanic chain of Kirigamine-Yashigamine is divided into three zones, showing echeron structure from the view point of the volcano-tectonics and rock facies. Petrographically, the inner zone is characterized by biotite dacites and hornblende andesites, the middle by obsidians, hornblende andesites and the outer by pyroxene andesites. The petrographic characters and the mode of eruptions in the same zone show remarkable similarities. The comparison of the geologic features of each zone suggests that the genesis of rocks of these regions should be considered on the ground of the geologic history since Pliocene, and the character of the regional geology.
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  • Fourier-analysis on the (001) diffraction profiles of some sericites
    Hideomi KODAMA
    Article type: Article
    1961 Volume 1961 Issue 56 Pages 18-23
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_18
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    HOUSKA and WARREN'S Fourier-analysis method has been applied to an interpretation of basal reflections, for four samples of sericite, which represent the various degrees of line broadening each other. Referring to the crystallinity of muscovite as standard, it has been confirmed that the line broadenings of three samples are due to both particle size and crystal distortion effects and the line broadening of the other is only due to particle size effect. Considering the correlation of the degrees of distortion with chemical data, distortion effect may be related to the amount of aluminium substituting silicon in tetrahedral coordination.
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  • Rheology and Geology
    Yukimasa SAITO
    Article type: Article
    1961 Volume 1961 Issue 56 Pages 24-34
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_24
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  • Life and Works of Ken-ichi SUGI
    Akiho MIYASHIRO
    Article type: Article
    1961 Volume 1961 Issue 56 Pages 35-38a
    Published: September 25, 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_35
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  • [title in Japanese]
    1961 Volume 1961 Issue 56 Pages 39
    Published: 1961
    Released on J-STAGE: July 24, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.1961.56_39
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