The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 56, Issue 657
Displaying 1-7 of 7 articles from this issue
  • Yukio KUWANO
    1950 Volume 56 Issue 657 Pages 311-321
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Nobuo Kurata
    1950 Volume 56 Issue 657 Pages 323-330
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The writer tries to lay the base of hydro-geology, from the geological study of water wells at the Howapei-plain of Chinese Republic and the prospecting work for underground water by Agricultural and Forestrial Ministry of Japan., Many data obtained by the electric resistivity method for prospecting survey of underground water, indicate the following facts : 1) electric resistivity of stratum varies by water quality, water-bearing quantity and the relation of distribution of the water containing space, 2) the so-called water-bearing stratum should be divided into workable and unworkable parts, 3) the seasonal changes of water level and the velocity of underground water suggest that the deeper water influences the shallower one., Then the physical for sediments and rocks inclose ocoperation with the geological consideraion may enable to solve the question as to the subsurface condition above the level of the underground water, the spring mechanizm and the quality of water in sediment.,
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  • [in Japanese]
    1950 Volume 56 Issue 657 Pages 330a
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1950 Volume 56 Issue 657 Pages 330b
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Wataru ISHIJIMA
    1950 Volume 56 Issue 657 Pages 331-338
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
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  • George Kojima
    1950 Volume 56 Issue 657 Pages 339-344
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    1., The so-called Mikabu system (or Series) in the Outer Zone of Southwestern Japan cannot be regarded as representing an independent stratigraphic unit., The Sambagawa crystalline schists, the so-called Mikabu System, and the non-or weakly metamorphosed rocks of Chichibu System must be studied together from view points of stratigraphy and metamorphic petrology., 2., On or near the boundary between the Sambagawa metamorphic zone and the non-or weakly metamorphosed zone of Chichibu System lies a zone of intense disturbance (Mikabu Tectonic Zone) traversed by systems of fault and shearing., This zone includes rocks from the two adjacent zones., Within this zone and in its neighbourhood, dykes of meta-gabbros, metadiabases, and meta-ultrabasic rocks (Mikabu Intrusive Green-Rocks) were intruded., The main composite dyke in Yoshinogawa region, Shikoku, is more than 100km long and more than 1., 3km wide, dipping southward at an angle of 30 degrees., It is proposed here to designate this zone of disturbance and igneous intrusion as the Mikabu Zone, the northern zone consisting mainly of Sambagawa crystalline schists as the Sambagawa Zone, and the southern zone consisting mainly of non-or weakly metamorphosed rocks of Chichibu System as the Chichibu Zone., 3., The Mikabu green-rocks were intruded during the movement of the Mikabu Tectonic Zone., Parts of the intrusive bodies were solidified under stress conditions., The writer has no reliable data about the age of the movement, but it can only be said that it occurred after the metamorphism of the Sambagawa crystalline schists had been completed.,
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  • Masahiro Okubo
    1950 Volume 56 Issue 657 Pages 345-350
    Published: September 20, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    As to the stratigraphic succession and zoning of the Gotlandian and Devonian deposits in Japan, we have had only the conceptive explanations., The writer wishes to make them clear in detail on the basis of the following standard succession : The Gotlandian and Devonian deposits in this district, called the Takainari System by the writer, may be classified into four groups, basing upon the lithologic characters., They are summarized and tabulated in Table 1., For the evidence of the geologic age of the Takainari System, we have hitherto found the Middle Devonian and the Middle Gotlandian faunas from the III Group and I Group respectively., The relations between the Takainari System and the Lower Carboniferous have not yet been clearly determined for the absence of the Upper Devonian index fossils, and the base of the Takainari System is indiscernible by the granitic intrusion.,
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