The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
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Volume 57, Issue 669
Displaying 1-5 of 5 articles from this issue
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  • Zur Hikoroichi-Serie und der bedeutenden Diskordanz vor der Hikoroichi-Epoche.,
    Masahiro Okubo
    1951 Volume 57 Issue 669 Pages 195-209
    Published: June 25, 1951
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.57.195
    JOURNAL FREE ACCESS
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    1) Die Hikoroichi-Serie ist verbreitet im schmalen Gelande des sudlichen Teils des Kitakami Gebirges im nordostlichen Honshu, Japan., Das Dorf Hikoroichi (-mura), unweit von Sakari-machi, Kesesn-gori, Iwate Prafektur, ist ihr typischer Verbreitungsort., In dieser Serie herrschen reichlich grunliche tuffogene Gesteine und kalkige Tonschiefern vor., Auch Sandsteine und unreine Kalkschichten treten gelegentlich auf., Nach Fossilieninhalt (Siehe Kap., VI) mag diese Serie der europaischen Etroeungt zu vergleichen sein, obwohl bis jetzt zufriedenstellende palaontologische Beweise dafur noch fehlen., Jedenfalls glaubt Verfasser, dass diese Hikoroich-Serie das unterste Karbon in Japan reprasentiert, 2) Die Basis der Hikoroichi-Serie besteht aus Pasalkonglomeraten ven 8m Machtigkeit und deckt die Schichtenreihen des Devons., Meine neuen stratigraphischen Untersuchungen in dem Dorf Hikoroichi lassen es klar werden, dass die Hikoroichi-Serie in bedeutender Diskordanz auf den darunterliegenden Devonschichten aufgelagert ist, bei denen die oberste Schicht fehlt., 3) Aus der dortigen geologischen Kartierung ist kein Zweifel mehr moglich, dass diese bedeutende Krustenbewegung vor der Hikoroichi-Epoche stattgefunden hat, und der Verfasser mochte den Vorschlag machen, diese Krustenbewegung die "Kesen-Faltung" zu nennen.,
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  • Transition of Pyrite into Marcasite, Magnetite and Hematite by Chalcopyrite Mineralization at the Sasagatani Mine, Western Japan., : Geological Studies of the Copper, Zinc and Lead Deposits in Japan and her Neighbouts., 4.,
    Hideki IMAI
    1951 Volume 57 Issue 669 Pages 211-216
    Published: June 25, 1951
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.57.211
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • On the Ultrabasic Rocks in the Miyamori District, Iwate Prefecture., (Part 3) : Studies on Serpentinization
    Yotaro Seki
    1951 Volume 57 Issue 669 Pages 217-224
    Published: June 25, 1951
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.57.217
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    The serpentinization of peridotitic rocks which constitute the main part of the Miyamori ultrabasic rock mass, Iwate prefecture, was studied in the field and also under the microscope with the result summarized as follows: In the eastern part of the mass (C-type area), the original peridotite is replaced by network veinlets of chrysotile serpentine, resulting in a mesh structure (C-type replacement), while in the western part (A-type area) by fiblous antigorite serpentine (A-type replacement)., In the C-type and also in the eastern border zone of the A-type area, some of the rocks have been subjected first to the C-type replacement and second to the A-type replacement (C-A type replacement)., It is concluded that the C-type replacement took place at a higher temperature than the A-type., The eastern part of the mass had been kept at a high temperature for some time as compared with the western, because the Palaeozoic sediments bordering the mass on its east had already been heated by the intrusion of granodiorite prior to the serpentinization of the peridotite., There is an indications that some of SiO 2, H 2O and CO 2 were migrated from the western eastern to the part of the peridotite mass during the serpentinization, which facilitated the replacement.,
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  • [title in Japanese]
    [in Japanese]
    1951 Volume 57 Issue 669 Pages 225a
    Published: June 25, 1951
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.57.225a
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1951 Volume 57 Issue 669 Pages 225b-226
    Published: June 25, 1951
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.57.225b
    JOURNAL FREE ACCESS
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