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 50, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • Studies on the sphalerite from the Hitachi Mine
    Masataka Endo
    1963 Volume 50 Issue 6 Pages 209-217
    Published: December 05, 1963
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.50.209
    JOURNAL FREE ACCESS
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    Some authors have indicated the fact that the part of the ore deposits of Hitachi mine were subjected to the thermal metamorphism by the intrusion of the post-ore two mica adamellitc mass. Observing FeS of sphalerites distributed widely in these ore deposits, the writer investigated the effect of post-ore intrusive. Consequently, FeS content of sphalerites enriched with the rise of temperature, on the contrary diminished with the increase of pressure. These results could be explained by Kullerud's theory (1953).
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  • Vivianite from the Cguchi oil field, Niigata Prefecture
    Geochemical studies on the sedimentary rocks (I)
    Masahiro Abe
    1963 Volume 50 Issue 6 Pages 218-223
    Published: December 05, 1963
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.50.218
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    During the investigation of the cutting samples from the Oguchi exploratory well, R-8, in the Nagaoka basin, Niigata Prefecture, the writer collected some interesting specimens from the cuttings.
    This mineral occurs as cobalt coloured aggregates of very fine crystal or very small muddy mass. Its chemical composition is, P2O5 26.75%, FeO 25.41%, Fe2O3 18.68%, SiO2 0.84%, TiO2 0.12%, MgO 0.36%, H2O(+) 14.28%, H2O(-) 13.51%, total 99.95%.
    The chemical composition and property shows good approximation with those of vivianite from Kawatabi reported by Yagi(1948).
    The environment of sedimentation of this mineral is discussed on the basis of these results. It is suggested that their occurrence affords important criteria for the interpretation of the complex phenomena related with the sedimentation. The deposition of sediments is due to the factor of the ionitic potential, pH and Eh control.
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  • Metablastic hornblende gabbro and diorite from the middle of Horoman river, Hidaka, Hokkaido
    Hiroshi Asai
    1963 Volume 50 Issue 6 Pages 224-234
    Published: December 05, 1963
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.50.224
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    Hornblende gabbro, diorite and gabbro-diorite occur in the sheared zone of biotite gneiss and basic hornblende plagioclase rocks. Careful observations on the occurrence of these rocks and the comparison of the component minerals between the coarse igneous textured rocks and the country metamorphic rocks have revealed that the basification and the acidification of plagioclase occur more intensively in igneous textured rocks than in metamorphic rocks, and moreover quality of the country metamorphic rocks provide for that of gabbro and diorite and the regulation is not vice versa.
    Consequentry, these igneous textured rocks in these districts are the metablastic rock originated from the country rocks, from which it is produced by metamorphic differentiation.
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  • GEOLOGY AND PETROLOGY OF CHOKAI VOLCANO, NORTHEASTERN JAPAN. PART II, PETROCHEMISTRY AND PETROGENESIS(1)
    KOSUKE ONUMA
    1963 Volume 50 Issue 6 Pages 235-244
    Published: December 05, 1963
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.50.235
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    The rocks from the Chokai volcano are classified into two series, the high-alumina basalt series and the calc-alkali rock series. The calc-alkali rock series is also divided into two types, the hornblendebearing type and the hornblende-free type. The high-alumina basalt series has intermediate character in chemical composition between the alkali rock series and the tholeiite series, especially as concerned to the alkali contents. It is worthy of note that the high-alumina, basalt series of this volcano is richer in alkali contents, especially in K2O_??_, than those from other districts.
    The calc-alkali rock series is derived from the high-alumina basalt series by assimilation and shows also intermediate chemical character between the calc-alkali rock series derived from alkali olivine basalt magma and that derived from tholeiite magma. Difference of the chemical composition is found between the hornblende-bearing type and hornblende-free type; i. e., the former has higher MgO/FeO+Fe2O3 ratios than the latter. Similar relations is also found in many other districts in Japan. Probably the appearence of hornblende depends upon not only contamination, but also the difference of chemical composition of the original magmas before contamination.
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