The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 59, Issue 697
Displaying 1-3 of 3 articles from this issue
  • Kametoshi KANMERA
    1953 Volume 59 Issue 697 Pages 449-468
    Published: October 25, 1953
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    T., M, x'rsaxccro and 1%., KANMEICA (., 1949) published a preliminary report on the couxglornerate-'beaiing Permian Kuma formation in the upper valley of the I-Iikaja inn t)ae Kuma rnassif, southern Kyushu., The present paper is a report on the details of the stratigraphy izxcludingremarlcs on fusulinid fossils from the formation and discussion on the correlation abundantly with otlxer., eong1ornerate-bearing late Permian formations in the Japanese Islands., For a brief account of the stratigraphy and rock facies of the I{urna formation, the reader is requested 'to refer to the previously published paper and the columnar seat, Tons in the Japanese text of the present paper., Here I will present an outline of the fusulinid faunule., In the Kuma formation, lintestones occur at four horinzons and contain abundantly fusulinid'fossils as indicated in the columnar sections., In the faunale, the most diagnostic members, jlnich are predominant in every horizon, are five species of Yaoeina, and Lepidolina., All the species of Yabeina are of much more advanced type than Yabeina, globosa (YABE)(=Y., inouyei DEPRAT) and Y., katoi OZAWA., The last two are characteristic elements of the Yabeina globosa zone, which has hitherto been recognized as the youngest fuslinid zone in Japan., The assemblage of fusulinids from the Kuma formation represents a biologic group not previously recorded from Japan, and is markedly different from the faunule of the Yabeina globosa zone., The faunule of the Yabeina globosa zone is widespread in Japan and always contains certain species of Neoschwagerina, while in the Kuma formation neither remains of the Neoschwagerina nor species common to the faunule of the Yabeina globosa zone have been found., In the Kuma massif the Yabeina globosa zone is exposed in a locality somewhat separated from the area of the Kuma formation, and, accordingly, the stratigraphic relationship is hardly determine in the field., However, the faunule of the Kuma formation is entirely different from that of the zone of Yabeina globosa and is biologically more advanced than the latter., The late Permian formations which can be correlated with the Kuma formation are widely distributed in a number of separated areas in the Japanese Islands., For example, they are the Mizukoshi formation (T., MATUMOTO and H., HUZIMOTO) in central Kyushu, the Shiraiwa formation (R., T0RIYAMA, the upper part of the Tsunemori group of M., KATAYAMA) in Yamaguchi prefecture, the Nukada and Maizuru formations (K., NAKAZAWA) in Koyto prefecture, the Yasuba type limestone conglomerates (with fusulinids in the matrix) of the Yasuba and other areas (R., TORIYAMA) in Kochi prefecture and of Dodo (K., K0NISHI) in Okayama prefecture, and the Toyoma formation (M., MINATO) in the Kitakami massif., These formations generally consist chiefly of black shale, sandstone, remarkable conglomerate, and subordinataly intercalated small limestone, lenses., The conglomerate contains boulders, cobbles and pebbles of granitic and various other igneous rocks., In the limestones Yabeina shiraiwensis OZAWA, Y., yasubaensis, TORIYAMA, Lepidolina kumaensis KANMERA (MS) L., toriyamai KANMERA (MS) and other closely related forms are contained., From these facts I have arrived at the conclusion that the faunules of the Kuma formation and other conglomerate-bearing formations mentioned above constitute the zone of Lepidolina (or the upper zone of Yabeina), which is distinguished from the zone of Yabeina globosa., The faunule of the Kuma formation is closely related in specific composition to the faunule described by GUBLER (1935) from Cambodge of Indochina and to that described by THOMPSON and WHEELER (1942, 1948) from the Marble Canyon limestone of British Columbia., In these faunules representatives of Lepidolina and the advanced type of Yabeina are present and some of them are common to ours., Therefore these faunules are probably of the same age.,
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  • Kitaro HAYASE, Ryohei OTSUKA
    1953 Volume 59 Issue 697 Pages 469-477
    Published: October 25, 1953
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The writers have recognized the existence or two types of pyrite, as mentioned in the previous report-Part 2., One of them was high in the electrical resistance and had a negative temperature coefficient., In contrast, the other was low in the electrical resistance and had a positive temperature coefficient., Examination by the X-ray powder method and spectrum analysis was carried out., The results obtained are shown in the diagram (Fig., 1) and Table 1., The writers also examined the etched surface of several samples of pyrite with the electron microscope., (See Fig., 2, A-F) The results of the investigation indicate that the electrical properties of pyrite such as the electrical resistance and the thermoelectric potential will be remarkably affected by the existence of a intricate structure of the crystal domain in pyrite and the mode of arrangement of the domain rather than by chemical composition of the pyrite (the ratio of sulphur to iron), or impurities., The thermoelectric potential of powdered samples of pyrite which were separately mixed with quartz, zincblende, and magnetite were measured., The effect was almost neglizible when the material mixed with the pyrite was less than 5% of the total sample., (See Fig., 3) Measurement of the thermoelectric potential was carried out on samples of pyrite from the Taro deposit., It was gradually higher in value in the middle part of the vein, on which the sample to be examined was taken across it between both walls., Therefore, it might be taken that the formation temperature of pyrite was of the highest in the middle part of the vein., (See Figs., 4 and 5) In the Yanahara deposit, measurement of the thermoelectric potential of pyrite was carried out at the place where a part of the ore body was changed to pyrrhotite and magnetite by thermal metamorphism of a quartz porphyry dyke., The measurement, indicates that the temperature of the pyrite which was originated by thermal metamorphism was gradually higher in the pyrrhotite zone., (See., Figs., 6, 7 and 8)
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  • Mitsue KOIZUMI, Satoru H0S0MI
    1953 Volume 59 Issue 697 Pages 478-486
    Published: October 25, 1953
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    It has been found by the writers that, in the majority of cases, the decrepigraphs of quartz have a form similar to that shown in Fig., 3, which has three inflexion points where the rate of decrepitation increases suddenly., From microscopic observation of the heated samples of quartz, it has been interpreted that the popping at the first peak in the curve is produced by the breaking out of liquid inclusions., The third peak shows the cracking of crystals caused by the existence of cleavage and parting, volume change followed by transition, anisotropy of thermal conductivity and expansion, presence of solid inclusions, or lattice imperfections., And the second peak may be observed as superposition of the above-mentioned two kinds of sound., From these results, it has been found that, as the inflexion point at the beginning of the first peak can be taken to represent the temperature of complete filling of the inclusions with an allowance for possible overshoot, the decrepitation method may be used for measuring temperature of forming the inclusions instead of the heating stage-microscope method., However, in some cases when liquid inclusions are scarcely found in the sample, or when the sound produced by the breaking out of the liquid inclusion is too low to be detected, the inflexion point at the beginning of the second peak or the third peak may be in danger of being mistaken for that of the first peak.,
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