Chikyukagaku
Online ISSN : 2188-5923
Print ISSN : 0386-4073
ISSN-L : 0386-4073
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Volume 1, Issue 1
Displaying 1-13 of 13 articles from this issue
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Original Papers
  • Study of carbonaceous materials in Akasaka limestones.
    Minako WATANABE, Shuji ABE, Shizuo FUJIWARA
    1967 Volume 1 Issue 1 Pages 1-6
    Published: 1967
    Released on J-STAGE: October 31, 2016
    DOIhttps://doi.org/10.14934/chikyukagaku.1.1
    JOURNAL FREE ACCESS
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    Electron paramagnetic resonance (EPR) technique was used for the study of carbonaceous materials in Akasaka limestones (Paleozoic) of Gifu Prefecture. The intensities and line- widths of the EPR spectra were measured for 31 samples and chemical analyses were also carried out on the contents of organic carbon, manganese, iron and acid-insoluble inorganic matters. The average values of organic carbon contents, spin concentrations and line-widths are estimated at 0.084%, 1020 spins per gram of organic carbon and 3.2 gauss, respectively. And the g-values of the spectra are very nearly equal to that of DPPH. The carbonaceous materials in Akasaka limestones are distributed locally in the regions of the strontium concentrated and the low-crystallized limestones. Therefore, the carbonaceous materials are considered to be mainly derivatives of organic matters of ancient calcareous algae, which were pyrolized probably under relatively mild conditions. And it is also noted that the other Japanese Paleozoic limestones of 28 deposits (51 samples) do not exhibit paramagnetic characters owing to the presence of carbonaceous materials.
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  • Elementary Composition of Humic Acids from Lake Sediments
    Ryoshi ISHIWATARI
    1967 Volume 1 Issue 1 Pages 7-14
    Published: 1967
    Released on J-STAGE: October 31, 2016
    DOIhttps://doi.org/10.14934/chikyukagaku.1.7
    JOURNAL FREE ACCESS
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    Elementary composition of humic acids from 11 freshwater lake sediments was determined with the following results. 1) Carbon content (%): Soil (57.9)>Marine (52.3)〜Lake (51.9) Atomic H/C ratio: Marine (1.42)>Lake (1.31)>Soil (0.98) Atomic N/C ratio: Lake (0.087)>Marine (0.058)〜Soil (0.055) In elementary composition, humic acids of lake sediments resemble those of marine sediments rather than soils. This indicates a close relation of the constitution of humic acid to source materials and environmental condition of its formation. 2) The H/C and N/C ratios of humic acids from lake sediments, decrease with increase in their carbon content. And there exists a relationship between H/C ratio and absorbance at 600 mμ of humic acid. These regularities are essentially identical with those already observed for soil humic acids.
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  • A consideration on the Mechanism of Formation of the Zao Hot Springs
    Toshikatsu IRIYE, Isamu SHIDA, Osamu YAMAGATA, Masahiro SUZUKI
    1967 Volume 1 Issue 1 Pages 15-24
    Published: 1967
    Released on J-STAGE: October 31, 2016
    DOIhttps://doi.org/10.14934/chikyukagaku.1.15
    JOURNAL FREE ACCESS
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    The geological survey and the observation of microtremors showed that the Zao Hot Springs are situated on complicated sedimentary formation, composed of pyroclastic rocks and mud flows, and accumulated in an ancient volcanic crater. Several fissure zones, running in the direction of N 20°-40° W, have been noted in this area, and they are found to be parallel to the crater wall (see Fig.1). Hot spring vents are distributed mostly within a limited zone lying between the fissure lines F4 and F6. These springs are formed by mixing of groundwater and magmatic emanation ascending from the deep magma reservoir through the fissure structure. The discharge of the springs depends on the amount of groundwater supplied. As there is no simple relation between the content of soluble material and the temperature of these spring waters, it is thought that heat is supplied to the spring waters in a different manner for the magmatic components. It may be concluded that the supply of heat depends on the thermal conductibility of rocks.
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Abstracts -Geochemical Symposium-
1. Genesis of sulfide ore deposits
2. Evolution of the atmosphere and oceans
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