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 52, Issue 6
Displaying 1-6 of 6 articles from this issue
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  • Biotite bigh-grede metamorphic rocks
    Nobumichi Shimizu, Shohei Banno
    1964 Volume 52 Issue 6 Pages 187-197
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.187
    JOURNAL FREE ACCESS
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    The phase equilibrium relationships governing the stability of biotite in high-grade pelitic schists can be studied in the system K20-MgO-FeO-AI203-Ti02-H2O-O2. Assuming that potassium feldspar and quartz are present in excess and that water and oxygen are mobile components, the phase equilibrium relationships may be interpreted by a tetrahedral diagram having A1203-Ti02-MgO-FeO at its apices.
    The phase equilibeium relationships between biotite, garnet and orthopyroxene from the northwest Adirondack Mountains, Lützow-Holm Bay area, and the charnockitic terranes in Madras and Granuligebirge are dicsussed. Based on the biotite composition field, it is concluded that the rocks in the northwest Adirondack Mounains and the Lützow-Holm Bay ares belong to a similar subfacies of the granulite facies, and those in the Granulitgebirge and Madras terrane belong to another subfacies of the granulite facies that represents higher temperatures than the former. It is also concluded that the biotite composition fieid of rocks in the Emeryville area and other amphibolite facies terranes have larger stability field than the granulite facies biotite.
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  • Petrological studies of the alkali basalts from eastern San-in, Japan (2)
    Basalts of Hyogo Prefecture
    Kyoko Oji, Yoshio Oji
    1964 Volume 52 Issue 6 Pages 198-204
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.198
    JOURNAL FREE ACCESS
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    The basalts of Hyogo prefecture are composed of many trachybasalts and a few trachyandesites, being accompanied with quartz xenocryst bearing andesite which has genetic relationship with those alkali rocks. They are lava flows which erupted in the age from Pleistocene to Recent. Eight samples of them have been chemically analysed anew. The basalts are characterized with properties that : 1) The rock-type having both plagioclase and olivine phenocrysts is abundant. 2) There is hardly any biotite and zeolite. 3) Basic inclusions are not contained and a few xenocrysts are found. 4) But there is quartz basalt that belongs to the calc-alkali rock series, which is derived from the alkali rock series by the contamination of granitic rocks. 5) They have a chemical tendency to be rich in Al2O2 and CaO and poor in K2O and TiO2. This is occasioned by containing relatively many basic plagioclases.
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  • A problem of iron ion in sedimentary rocks
    Geochemical study on sedimentary rocks (II)
    Masahiro Abe
    1964 Volume 52 Issue 6 Pages 205-216
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.205
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    The writer has undertaken physical and chemical studies on the Neogene deposits distributed in Northeastern Honshu with the purpose of sedimentary petrology and environmental relationship.
    During these studies he was interested in problems concerning the sedimentary facies in the basin. Actually, the writer has been studying on iron ion in the Neogene sedimentary rocks. In this paper he describes his provisional criteria for analysis of iron ion in sedimentary rocks, with his basic considerations and laboratory experiments.
    The results do not explain the differeces in the properties of the iron ion and, therefore, the source rocks themselves in the different areas can not be strictly differentiated and identified. It should be pointed out that selective concentration of the iron ion in the present areas and the vertical (stratigraphical) and the horizontal (local) concentration of those iron ion are considered to be one of the environmentel factors for the formation of those source rocks.
    With the accumulation of the further data it is hoped to be able to make clear the environmentel relationship existing between the volcanics characterizing marginal part of the basin and the normal sedimentaries characterizing the marine-fresh water environments.
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  • CHEMICAL COMPOSITION OF PALEOZOIC ROCKS FROM NORTHERN KISO DISTRICT AND OF TOYOMA CLAYSLATES IN KITAKAMI MOUNTAINLAND: SUPPLEMENT. CARBON AND CARBON DIOXIDE
    MASATO KATADA, HIROSHI ISOMI, EI OMORI, TEIKO YAMADA
    1964 Volume 52 Issue 6 Pages 217-221
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.217
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    [in Japanese]
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  • On Shimanto Metamorphic Zone
    A Comment on “Sanbagawa metamorphism in the central part of Kii Peninsula” by Y. Seki, T. Oba, R. Mori and S. Kuriyagawa
    Hiroshi Kano
    1964 Volume 52 Issue 6 Pages 222-224
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.222
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  • A reply to the comment by Dr. H. Kano
    Yotaro Seki
    1964 Volume 52 Issue 6 Pages 224-225
    Published: December 05, 1964
    Released on J-STAGE: August 07, 2008
    DOIhttps://doi.org/10.2465/ganko1941.52.224
    JOURNAL FREE ACCESS
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