The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Online ISSN : 1883-0765
Print ISSN : 0021-4825
ISSN-L : 0021-4825
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Volume 72, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • SYNTHESIS OF BARIUM-STRONTIUM SULPHATE SOLID SOLUTION AND SOME CONSIDERATIONS ON THE GENESIS OF BARITE-CELESTITE DEPOSITS IN NEUQUEN PROVINCE, ARGENTINA
    KITARO HAYASE, GRACIELA R. MAS, AMADO L. BENGOCHEA
    1977 Volume 72 Issue 3 Pages 93-102
    Published: March 05, 1977
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.72.93
    JOURNAL FREE ACCESS
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    Experiments on the synthesis of barium-strontium sulphate solid solution were performed. The results showed that the cell constants a0 and c0 of the solid solution series vary linearly with respect to chemical composition and corresponding changes in b0 follow a curve with gentle slope. Since the synthesized mineral was richer in barium than the solution, the [Sr2+]:[Ba2+] ratio of the solution became gradually higher as crystallization of the mineral progressed. The results also showed that the distribution coefficient kBaSr increased with increasing temperature.
    It was observed that crystallization of the mineral with intermediate [BaSO4]:[SrSO4] molar ratio ranging from about 1:1 to 1:4 at 270°C and from about 3:1 to 1:9 at 170°C, was extremely more difficult than the minerals outside these ranges. This indicates a possibility that at these ranges an immiscibility area exists. It appears that the area is enlarged with decrease in temperature.
    Many barite-celestite deposits are found in Neuquen province, Argentina. Some of them are of vein-type traversing stratified rocks. Others have bedded shapes, roughly concordant with stratification and formed by selective replacement of limestone seams by barite and celestite. Measured homogenization temperature of liquid inclusions in barite and celestite, their chemical compositions, wall-rock alterations, the associated sulphide minerals and the results of the present synthesis experiments suggest that these deposits were formed under the following conditions: (1) Some of the ore deposits were formed by hydrothermal solutions poor in strontium at rather high temperatures; (2) Some others were formed by hydrothermal solutions rich in strontium at rather high temperatures; and (3) the rest of the deposits were formed by hydrothermal solutions rich in strontium at rather low temperatures.
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  • ESTIMATION OF FORMATION TEMPERATURE FOR THE TAISHU, TOYOHA AND KAMIOKA Pb-Zn DEPOSITS ON THE BASIS OF SULFUR ISOTOPE TEMPERATURE SCALE
    Yasuhiro Kiyosu, Nobuyuki Nakai
    1977 Volume 72 Issue 3 Pages 103-108
    Published: March 05, 1977
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.72.103
    JOURNAL FREE ACCESS
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    The 34S/32S ratios of coexisting sphalerite and galena from Taishu, Toyoha and Kamioka Pb-Zn ore deposits have been measured to estimate the temperature of formation of ore deposit. All of the sphalerite samples were enriched in 34S compared with galena. Sulfur isotopic fractionation between sphalerite and galena ranges from 1.5 2.0 permil in the Taishu and Kamioka deposits, while in the Toyoha deposits ranges mostly from 2.5 to 3.0 permil. The fractionation of coexisting samples from early stage vein in Toyoha deposits is smaller than those from later stage vein. Using these isotopic fractionations and experimental temperature scale (Kiyosu, 1973), the temperature of formation is estimated to be 350° to 400°C in Kamioka deposits, 300° to 350°C in Taishu deposits and 200° to 250° in Toyoha deposits. These isotopic temperatures are slightly higher than filling temperatures determined from fluid inclusions of quartz and sphalerite.
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  • CHEMICAL COMPOSITION OF FERROMAGNETIC COMPONENT OF PUMICE FLOW TUFFS IN SOUTHERN KYUSHU, JAPAN WITH SPECIAL REFERENCE TO THEIR ORIGINS
    Sadao Shoji, Toshio Sugawara, Shinsuke Kobayashi
    1977 Volume 72 Issue 3 Pages 109-113
    Published: March 05, 1977
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.72.109
    JOURNAL FREE ACCESS
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    The chemical composition of ferromagnetic component of Kakuto, Ata and Osumi pumice flow tuffs covering the most area of Southern Kyushu, was investigated in relation to their origins. It was found that the combination of weight ratios of Mn/T-Fe+Ti-Zn/T-Fe+Ti was closely related to the origins and highly useful for the identification of these felsic pumice flow tuffs. The great deviation of the combination values of Kakuto samples was due to the plentiful existence of accessory or accidental materials.
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  • TEMPERATURE AND PRESSURE OF THE RYOKE GNEISSES ESTIMATED BY GARNET-CORDIERITE GEOTHERMOMETER
    AKIRA ONO
    1977 Volume 72 Issue 3 Pages 114-117
    Published: March 05, 1977
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.72.114
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    Cordierite and garnet of gneissic rocks from Takato were studied to estimate temperature and pressure of the Ryoke metamorphism. It is turned out that temperature is about 600°-650°C and pressure is 4.5-5kb.
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  • [title in Japanese]
    1977 Volume 72 Issue 3 Pages 118-135
    Published: 1977
    Released on J-STAGE: July 13, 2012
    DOIhttps://doi.org/10.2465/ganko1941.72.118
    JOURNAL FREE ACCESS
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