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 67, Issue 7
Displaying 1-3 of 3 articles from this issue
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  • ON THE SEDIMENTARY AND CONSERVATIVE ENVIRON
    MENT RELATED TO TECTONIC MOVEMENT OF KABASAWA FOSSIL PLACER DEPOSIT
    HIROHIKO SAITOH
    1972 Volume 67 Issue 7 Pages 209-217
    Published: July 05, 1972
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.67.209
    JOURNAL FREE ACCESS
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    The factors which influence the depositional environment of fossil iron-sand placer deposits are the climate, tectonic regime, general palaeogeographic environments, peculiarities of the source area, and the hydro-dynamic conditions in the front basin. It is obvious that the deposition of fossil iron-sand placer deposit is controlled more or less by these factors.
    The author (Saitoh, 1972) has reported on the general geology and tectonic movement near Kabasawa Mine area. The warping movement of Okubushi-Line which is the main tectonic line in this area controlled the differentiation and development of the Pliocene sedimentary basin and the deposition of Pliocene Sendai Group, especially Kabasawa sandstone and conglomerate member intercalated ilmenite placer deposit.
    It is the purpose of this paper to point out the fact that Kabasawa ilmenite placer deposit has been built up and kept in a very good condition being controlled by the warping movement of Okubushi-Line.
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  • PETROLOGY OF THE MUROTOMISAKI GABBROIC COMPLEX
    TOSHIHIKO YAJIMA
    1972 Volume 67 Issue 7 Pages 218-241
    Published: July 05, 1972
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.67.218
    JOURNAL FREE ACCESS
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    The Murotomisaki differentiated gabbroic complex locates at the extreme point of the Cape Murotomisaki, Shikoku Island. This complex intruded into the Murotohanto Group of Eocene in age. The zonal arrangement of which complex shows the indication of the fractional crystallization with gravitational sinking. Principal rock types of the complex are as follows: chilled marginal dolerite, picrite gabbro, fine-grained hyperathene bearing olivine augite gabbro, medium-grained hyperathene bearing olivine augite gabbro, augite gabbro pegmatite and ferrogabbro. The pegmatitic rocks of the latest stage intruded as small veins. Anygrain of pigeonite or inverted pigeonite is not found, whereas a small amount of hypersthene is observable as internal precipitates. Iron concentration in olivine and in augite is conspicuous at the upper part of the complex. Ilmenite is the predominant opaque minerals through the course of fractionation and magnetite appears at the latest stage. Fractional crystallization of OLIVINE THOLEIITE to intermediate iron concentration under low vapour pressure and low oxygen partial pressure is studied on these bases.
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  • STEREOGRAPHIC PROJECTION OF MINERAL ASSEMBLAGES
    SHOHEI BANNO
    1972 Volume 67 Issue 7 Pages 242-245
    Published: July 05, 1972
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.67.242
    JOURNAL FREE ACCESS
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    [in Japanese]
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