The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Volume 55, Issue 644-645
Displaying 1-3 of 3 articles from this issue
  • Katsuhiko SAKAKURA
    1949 Volume 55 Issue 644-645 Pages 49-52
    Published: May 20, 1949
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The results of quantitative or statistical studies of assemblages of smaller foraminifera will be used for comparison between two aggregations (degree of resemblance)., Of several formulae showing degree of resemblance, the following seems to be most comprehensive., [numerical formula] Where R : Resemblance degree a : Number of constituents of Group I b : Number of constituents of Group II c : Number of constituents, common in both Groups In applying this formula im comparison between two aggregations, it is reasonable to consider number of individuals in a species., Then the author introduced two empirical ways, one using logarithmic graph (fig., 1) and other adopting 2n (list no., 4), where "n" means evaluation weight replacing real number of individuals, and 2n showing limits of numbers to be represented by the weight "n".,
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  • Mitsue SAITO
    1949 Volume 55 Issue 644-645 Pages 53-58
    Published: May 20, 1949
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    By using thermobalance to dissociate cerussite into lead monoxide in the air, it is shown that the following intermediate basic carbonates were produced : PbCO3→2PbO·PbCO3→11PbO·PbCO3→19PbO3·PbCO3→PbO., As the procedure was undertaken in CO2 gas, however, the following salts were produced by dissociation : PbCO3→PbO·PbCO3(or 3PbO·2PbCO3)→2PbO·PbCO3→PbO., This fact was quite true with the differential thermal analysis., By using the filament manometer, dissociation pressures of cerussite were measured., From the results thus obtained, the relations between the dissociation pressure and the temperature were expressed by the following equations, and the heats of dissociation (Q) and the dissociation temperatures (t) were calculated as follows., (I) log p=15., 52-7200/T, Q=-32930 cal/mol, t=296., 5°C (II) log p=13;69-7152/T, Q=-32710 cal/mol, t=388., 5°C (III) log p=12., 36-6636/T, Q=-30350 cal/mol, t=426., 9°C (IV) log p=10., 50-5500/T, Q=-25160 cal/mol, t=448., 7°C In these equations, it will probably be said that (I) corresponds to the dissociation of PbCO3, (II) to that of 2PbO·PbCO3, (III) to that of 11PbO·PbCO3, and (IV) to that of 19PbO·PbCO3., The same experiments were taken with artificial lead carbonate., The process of dissociation is shdwn as : PbCO3→PbO·PbCO3→17PbO·PbCO3→PbO in the air, and shown as : PbCO3→PbO·PbCO3(or PbO·3PbCO3)→PbO·PbCO3→2PbO·PbCO3→PbO in the CO2 gas., In cnclusion, the following two facts are remarkable., (1) With the intermediate basic salts, there are remarkable differences in the chemical composition and existing temperatures between the natural and artificial lead carbonate., (2) Even in the case of the same specimen, the intermediate basic salts differ somewhat in their chemical composition and their existing temperature according to the atmnospheric conditions whether the dissociation is taken in the air or in CO2 gas.,
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  • Kunio KOBAYASI, Takasi YOSIDA
    1949 Volume 55 Issue 644-645 Pages 59-64
    Published: May 20, 1949
    Released on J-STAGE: April 11, 2008
    JOURNAL FREE ACCESS
    The gneissic rocks, tire oldest rocks outcropping in the Kosiri District of the Santyoku Coal Field, had a ridge-shaped form on its surface at the beginning of the Cambrian Epoch., The Tyosen System becomes somewhat thinner at the apot which covers the ridge., The structural graben in NNE direction was formed by the faulting during the Mesozoic Era, succeeded by the Bukkokuzian mazmatic action., The imbrication in the southern part was due to the existence of the ridge-shaped Pre-Cambrian mass.,
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