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 44, Issue 5
Displaying 1-8 of 8 articles from this issue
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  • Clay minerals associated with some manganese ore deposits
    Toyofumi Yoshimura, Haruo Shirozu, Mayumi Yoshinaga
    1960 Volume 44 Issue 5 Pages 221-229
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.221
    JOURNAL FREE ACCESS
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    Three montmorillonites and a serjcite-montmorillonite regular mixed-layer mineral are described. The montmorillonites occur in the altered zone of the country rocks around the manganese-dioxide ore deposits, which were formed by the hydrothermal replacement in the tuffaceous rocks. They bear various colors, and (1) white and (2) brownishred masses from the Shiroiwa mine, Akita Prefecture, and (3) green one from the Miyazaki mine, Miyagi Prefecture, are mineralogically analyzed and shown that (1) and (2) are typical montmorillonite and (3) is beidellitic montmorillonite.
    The sericite-montmorillonite regular mixed-layer clay-mineral showing 25.2A spacing was found in a narrow fissure traversing the manganese ore deposit in the Paleozoic formation of the Aradani mine, Kyoto Prefecture. It associates with a large quantity of fine-grained bipyramidal quartz. X-ray, D. T. A. and chemical analyses along with heating-effect data show that the clay-mineral is a regular mixed-layer mineral having almost equal percentages of sericite and montmorillonite layers.
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  • Thermal study on some pyrolusites
    Kokichi Okada
    1960 Volume 44 Issue 5 Pages 230-235
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.230
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    Pyrolusites from some different localities in northeastern Janan were studied by means of X-ray powder method and D. T. A.. The d(100) value of X-ray powder pattern is 3.118-3.140_??_, and their d(110) and intensities are showed by linear relation. Peak temperature of D. T. A. is from 620°C to 680°C, d(110) is small as peak tempe-ature rise, and amplitude of D. T. A. is large as peak temperature rise. Intensities of X-ray pattern and amplitudes of D. T. A. of mixed samples of pyrolusite and quatzs, are proportional to each mineral ratios. Two types of pyrolusite were given from D. T. A. curves.
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  • Chemical compositions of anorthite and its mother rock
    Fumio Sato, Yoshio Kagawa
    1960 Volume 44 Issue 5 Pages 236-237
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.236
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    Large plagioclase and basic andesite containing it were chemically analyzed. Plagioclase proved to be anorthite of An93.4 composition. Its mother rock is not comparatively high in Al2O3 composition and it contains labradrite phenocrysts together with anorthite large crystals.
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  • Druse minerals in andesites from Hisatsu volcanic area
    Takashi Yamamoto
    1960 Volume 44 Issue 5 Pages 238-241
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.238
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  • Olivine gabbro, olivine norite in the vicinity of Horoman river in Southern Hidaka metamorphic zone (I)
    Hiroshi Asai
    1960 Volume 44 Issue 5 Pages 242-248
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.242
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    Olivine gabbro, brown hornblende-olivine gabbro, melaorthopyroxene-olivine gabbro, brown hornblende-olivine gabbro and olivine bearing-brown hornblende-clinopyroxene norite, which have the coarse idiomorphic or hypidiomorphic granular texture or sometimes have the coarse metablastic ophitic texture, occur in micro or medium grained granular basic rocks which are orthopyroxene-plagioclase-brown hornblende amphibolite, glomelo-porphyroblast-orthopyroxene-brown hornblende plagioclase rock, brown hornblende norite, brown hornblende-clinopyroxene norite and olivine porphyroblast-brown hornblende gabbro.
    Judging from the careful observations in the field and under the microscope, the writer observes the facts that the phenomena of the concentration and the dispersion of brown hornblende occur in the country basic rocks or even in olivine gabbro and olivine norite, and that in these rocks the metablastic orthopyroxene or clinopyroxene or even olivine crystallize in the place of early crystallized unstable mafic minerals and that the phenomena of clouding, cleaning and basification of plagioclase occur in these rocks.
    The progressive ultra-metamorphism which originates olivine gabbro or olivine norite, happens at the heigher stage of metamorphism in this district.
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  • Lattice constant of barite from Ozaki mine
    Keiichi Omori
    1960 Volume 44 Issue 5 Pages 248-249
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.248
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  • Crystal forms and lattice constants of cassiterites from Miyoshi, Otani and Kaneuchi mines
    Sakichi Ashida
    1960 Volume 44 Issue 5 Pages 250-255
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.250
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    Miyoshi mine, Okayama Prefecture, Otani and Kaneuchi mine, Kyoto Prefecture are pneumatolitic tungsten deposits, in where cassiterite are found in quartz vein associated with wolframite, scheelite and arsenopyrite. Single crystals of casisterite from Miyoshi mine consist of s(111), e(101), a(100) and m(110), and (101) and ninelings twinning are also found. Prismatic crystals of cassiterite from Otani and Kaneuchi mine are s(111), z(231), sometimes e(101) and narrow prismatic faces of h(120) to h(210), and (101) twinning are found. Unit cell constant of cassiterite from Miyoshi mine is a0 4.740A, c 0 3.185, Otani mine is a0 4.739A, c0 3.186 and Kaneuchi mine is a0 4.739 A, c0 3.186.
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  • Some reasoning on the origin of basaltic magmas based on the data of crustal structure
    Isamu Shibata
    1960 Volume 44 Issue 5 Pages 255-261
    Published: October 01, 1960
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.44.255
    JOURNAL FREE ACCESS
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