Mining Geology
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Volume 30, Issue 159
Displaying 1-5 of 5 articles from this issue
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  • The Shimokawa Diabase and Wall Rock Alteration of the Shimokawa Ore Deposit, Hokkaido
    Mamoru SUZUKI, Yasuhiro KUBOTA
    1980 Volume 30 Issue 159 Pages 1-18
    Published: March 15, 1980
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11456/shigenchishitsu1951.30.1
    JOURNAL FREE ACCESS
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    The Shimokawa ore deposit has been regarded as a cupriferous iron sulphide deposit and is located at an upper horizon of the Shimokawa diabase. The diabase occurs as wall rock and is composed mainly of pillow lavas and diabase sheets with intercalations of slate and sandstone.
    The diabase surrounding the ore deposit suffers amphibolic alteration which varys from actinolite to actinolitic hornblende zone towards the orebody. The diabases in the central part of the actinolitic hornblende zone is sheared and changed to chloritized and carbonatized diabase, and simultaneously slate changed to black phyllite. These rocks are successively altered Fe-rich chlorite, quartz and sericite, consequently changed to green schistose rock which always forms disseminated or banded ores. The green schistose rock indicates always metasomatic features and does not occupy any stratigraphic horizon. The evidence suggests that the ore deposit was derived from epigenetic process. result, much new evidence regarding the nature of the mineralization have been gained. Several new orebodies have been discovered in the mining areas as a result of our investigation. In this paper, the wall rock alteration of the Shimokawa ore deposit is reported.
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  • Formation of Feldspar-bearing Skarn from the Assemblage Calcite-Biotite-Quartz in H2O-CO2 Mixtures
    Tetsuya SHOJI
    1980 Volume 30 Issue 159 Pages 19-26
    Published: March 15, 1980
    Released on J-STAGE: December 14, 2009
    DOIhttps://doi.org/10.11456/shigenchishitsu1951.30.19
    JOURNAL FREE ACCESS
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    The stability of the assemblage calcite-biotite-quartz in H2O-CO2 mixtures has been estimated on the basis of previous work in the systems CaO-MgO-SiO2-H2O-CO2, CaO-FeO x-SiO2 -H2O-CO2, MgO-KAlO2s-SiO2-H2O-CO2, and FeO-Fe2O3-KAlO2-SiO2-H2O.In the MgO-rich system, the assemblage becomes unstable owing to the appearance of the assemblage K-feldspar-tremolitic amphibole. On the other hand, in the FeO-rich sytem, the tie-line between K-feldspar and hedenbergitic pyroxene penetrates through the tie-triangle.The highest temperature of the calcite-biotite-quartz field is 600°C. The limit of the field shifts to the low temperature region with increasing MgO content and decreasing CO2 concentration in the system.
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  • Mineralization Age of the Yangjia-zhangzi Molybdenum Deposits, China
    Shunso ISHIHARA, Ken SHIBATA
    1980 Volume 30 Issue 159 Pages 27-29
    Published: March 15, 1980
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11456/shigenchishitsu1951.30.27
    JOURNAL FREE ACCESS
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    The Yangjia-zhangzi deposits are skarn-type molybdenum deposits that have been formed in lower Paleozoic calcareous beds by Mesozoic granitic intrusions. Phlogopite occurring in diopside skarm orebody is dated at 183 Ma. Thus the mineralization belongs to Jurassic, the early Yanshanian cycle.
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  • [title in Japanese]
    1980 Volume 30 Issue 159 Pages 31-48
    Published: March 15, 1980
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11456/shigenchishitsu1951.30.31
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1980 Volume 30 Issue 159 Pages 50-52
    Published: March 15, 1980
    Released on J-STAGE: June 12, 2009
    DOIhttps://doi.org/10.11456/shigenchishitsu1951.30.50
    JOURNAL FREE ACCESS
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