The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 56, Issue 654
Displaying 1-10 of 10 articles from this issue
  • Enzo KONNO
    1950 Volume 56 Issue 654 Pages 95-97
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Kotora HATAI, Syozo NISIYAMA
    1950 Volume 56 Issue 654 Pages 99-100
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
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  • Kotora HATAI, Tamio KOTAKA
    1950 Volume 56 Issue 654 Pages 101-104
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
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  • [in Japanese]
    1950 Volume 56 Issue 654 Pages 105-110
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Hideo Minato
    1950 Volume 56 Issue 654 Pages 111-118
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    Ten scorodite samples (from seven localities in Japan) and one aluminoscorodite sample were studied., The refractive indices, as measured by dispersion methods, are shown in tabel 6., Not only the composition but also crystallinity seem to be responsible for the variation in refractive indices of these minerals., X-ray powder photographs of stalactitic and massive scorodite taken with Fek a are of the same pattern as the well known crystals from Kiura, showing their identity (Table 8 and Fig., 10)., Powder photographs show that an aluminoscorodite, too, is of the same structural type, intermediate between scordite (FeAsO 4·2H 2O) and mansfieldite (ALAsO 4·2H 2O)., Thus aluminoscorodite is analogous to barrandite, which is intermediate between strengite (FePO 4·2H 2O) and variscite (ALPO 4·2H 2O).,
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  • Nobukazu Kambe
    1950 Volume 56 Issue 654 Pages 119-125
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    Little has been known of the stratigraphy of the Shidaka coal-bearing group, and its age has been a most question., The group can, however, now be readily classified and its age determined as late Triassic because Myophoria 6 spp., in addition to Gervilleia spp., Nucula? spp., and a few others were discovered in the Shidaka formation., It is thoutht to be younger than Carnic because the Carnic Nabae formation adjacent to Shidaka coal-field is strongly disturbed together with the older fromations, while the Shidaka-group lies with clino-unconformity on the disturbed Paleozoic formation and, cut by faults, forms a half-basin by itself., The clino-unconformity at the base of the group can be seen on the western margin of the basin., On the east side of the basin a limestone in the basement yields Neoschwagerina., The Shidaka-group, 1650 to 1720m thick, is composed of molasse-type sediments., The component formations are in descending order as follows: Shidaka formation-260 metres., Coal-bearing sandstone., Coal-bearing alternation of calcareous shale & sandstone., Conglomerate., Plants and shells locally present., Okadashimo formation-250-180 metres., Alternation of shale & sandstone., Conglomerate., Okadayuri formation-430 metres., Shale., Alternation of sandstone & conglomerate., Conglomerate Humuro formation-600 metres., Reddish or greenish sandstone & conglomerate., Alternation of fine conglomerate & sandstone., Reddish or greenish shale., Alternation of sandstone & conglomerate., Conglomerate., Hannyaji formation-180 metres., Alternation of fine conglomerate & sandston., Reddish or greenish sandy shale & shale., Conglomerate & sandstone.,
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  • [in Japanese]
    1950 Volume 56 Issue 654 Pages 126
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
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  • Umeka Kitazaki, Yoshiko Ichida
    1950 Volume 56 Issue 654 Pages 127-135
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    There are some noted phosphorite beds contained in the Tertiary formations distributed widely in Noto Peninsula., These beds belong to two different geological units ; one is the Noto series (F 2-F 3), and the other is the Nanao series (F 3-G)., The process of formation of the phosphorite deposits is to be considered as the process of diagenesis of the sedimentary rock in general., The process of deposition of the mother rock and the process of diagenesis of the particular part of the rock are to be distinguished clearly from each other., On the studies of the process of deposition of the unaltered mother rock of the phosphorite beds of above mentioned district, it is found that the phosphorite beds were deposited as the calcareous part in those strata., From the observations of the relation between the phosphorite beds and the surrouding rocks, it is ascertained that the phosphatization was taken on after the desposition of the stratum had completed., The calcareous sediments were weathered by the phosphoric acid contained in the circulating water rich in organic contents, and the loss of CaO and the enrichment of P were resulted., The source of phosphorus offerred to the calcareous sediments is most appropriately attributed to the colloidal organic substance covering the sea bottom under the peculiar condition, such as logoon, coastal region, etc., The difference between the rock facies in the stratum causes the different reactions respectively for the circulating water rich in organic contents., The phosphorus has been enriched in the calcareous rocks surrounded by the non-calcareous ones, and thus the phoshorite bed has been resulted., The environment and process of phosphatization are to be considered as indifferent ones to the environment and process of deposition, but the composition of rock, both chemical and physical, that is the resultant products of the deposition, has the main roll in the process of phosphatization, in the intimate relation with the condition in which the stratum is laid after the deposition.,
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  • [in Japanese]
    1950 Volume 56 Issue 654 Pages 136
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
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  • Toshio SUDO
    1950 Volume 56 Issue 654 Pages 137-142
    Published: August 05, 1950
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    (1) The writer studied the mineralogical properties of opal and opal-like mineral found in some clays and altered volcanic rocks in Japan and found that some of these minerals show the mineralogical properties of cristobalite., (2) From this, it is reasonably infered that in some cases there is an intimate relation between opal and cristobalite and that cristobalite is formed as a secondary mineral
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