Earth Science (Chikyu Kagaku)
Online ISSN : 2189-7212
Print ISSN : 0366-6611
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Volume 22, Issue 5
Displaying 1-6 of 6 articles from this issue
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  • On the Exsolution Lamellae of Diopside in Olivine Gabbro from Horoman Area, Hokkaido
    Yoshiaki YAMAGUCHI, Katsutoshi TOMITA
    Article type: Article
    1968 Volume 22 Issue 5 Pages 219-223
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_219
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    Diopside in olivine gabbro from Horoman area, Hokkaido, has exsolution lamellae arranged parallel to the (100) diallage partings. These (100) exsolution lamellae are composed of two different lattices, i. e., a monoclinic pyroxene with space group P21/c, and an orthorhombic pyroxene with space group Pbca. These two phases may presumably be grown sub-microscopically side by side. Estimating the chemical composition of these (100) lamellae by refractive indices and lattice constants, the monoclinic pyroxene with space group P21/c is a closer member to clinoenstatite in the compositional range from clinoenstatite to pigeonite.
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  • The Study of the Shimanto Terrain in the Kii Peninsula, Southwest Japan (Part 2)
    The Present Status of the Research and the Southern Former-land in the Pacific Ocean
    The Kishu Shimanto Research Group
    Article type: Article
    1968 Volume 22 Issue 5 Pages 224-231
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_224
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    The geologic settings of the Shimanto Terrain in the Kii Peninsula, the properties of coarser elastics and these source areas, and sedimentary structures were described in brief. The main geosynclinal stage of the Shimanto Terrain is from the Cretaceous to the lower Miocene and is divided into two sub-stages, that is, the Cretaceous and the Paleogene to the lower Miocene. The sediments of the former sub-stage (the Hidakagawa group) have eugeosynclinal sedimentary facies and the latter (the Muro group) miogeosynclinal. From, the viewpoint of tectonics, the difference between them is remarkable. Sediments of the Shimanto geosyncline are chiefly turbidites. Paleocurrent analysis by sole marks shows that the sediments of the Hidakagawa group were mostly supplied by longitudinal currents of the east to west and west to east trends, and those of the Muro group were mainly supplied longitudinally as in the case of the Hidakagawa group, and partly from north and from south by lateral currents. The northern provenance are the Acid Volcanics of the Inner Zone, the Ryoke Complex, the Paleozoics of the Chichibu Terrain and the Torinosu-group and its correlatives. The southern source area must have existed in the Pacific Ocean. The paleocurrent data and the discovery of the orthoquartzite gravels from the Muro group at the southern end of the peninsula suggest the existence of a missing former-land to the south of the Shimanto Terrain. These were discussed in some detail.
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  • Granites of the Niino District, Nagano Prefecture (Part 1)
    Hiroo KAGAMI
    Article type: Article
    1968 Volume 22 Issue 5 Pages 232-239
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_232
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  • On "Graywacke" : Part 2 Origin of Variety of "Graywackes"
    Tsunemasa SHIKI
    Article type: Article
    1968 Volume 22 Issue 5 Pages 240-250
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_240
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    In this article, genetic relations between various types of " graywackes " were investigated synthetically. Several properties which have been pointed out by many workers as the characteristics of "graywackes ", and their meanings, were cited first. Several concepts such as provenance factor, textural and mineralogical maturity, mechanism of transportation (fluidity factor), and " three critical environments of deposition" mentioned by RICH, were summarized in their mutual relations, The origin of variety of "graywackes" was then explained successfully using the above concepts or ideas as shown in the schematized models of Figure 4. Post depositional alteration or diagenesis was mentioned in connection with the origin of clay matrix of graywackes.
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  • Precambrian of Baltic Shield (Part 2)
    Masahide OTA
    Article type: Article
    1968 Volume 22 Issue 5 Pages 251-262
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_251
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  • In Poznan and Warsaw
    Masao MINATO
    Article type: Article
    1968 Volume 22 Issue 5 Pages 263-265
    Published: September 25, 1968
    Released on J-STAGE: July 26, 2017
    DOIhttps://doi.org/10.15080/agcjchikyukagaku.22.5_263
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