The Journal of the Geological Society of Japan
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
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Volume 59, Issue 698
Displaying 1-5 of 5 articles from this issue
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  • Geology of the Yanagida District, Noto Peninsula
    Kyosuke KUBO
    1953 Volume 59 Issue 698 Pages 489-496
    Published: November 25, 1953
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.59.489
    JOURNAL FREE ACCESS
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    This district consists of the Miocene (F2-F3) Minazuki formation together with various volcanic rocks such as hypersthene-augite andesite, bronzite andesite, olivine andesite, olivine basalt and dacite., Of these volcanic rocks, the olivine basalt belongs to the rock series of the Circum-Japan Sea Alkaline Rock Province, while the others belong to the rock series of the Cale Alkaline Rock Province as commonly found in Japan., It is interesting that these two rock series were erupted in the same period of volcanic activity and in the same limited area., The olivine basalt was erupted at the beginning of the deposition of the Minazuki formation of this district., The main activity which produced the hypersthene-augite andesite group seems to have nearly ceased with the end of the Anamizu stage and before the deposition of the afore-mentioned Minazuki formation., In the Minazuki stage pyroclastic and clastic sediments were mixed together in close connection with the volcanic activity., Accompanying the explosive eruption of dacite, enormous amounts of volcanic ash were deposited all over the district (the Ogi member)., These pyroclastic sediments reached a maximum thickness of more than 500m in the area east of this field, that is, near the center of the volcanic activity, and were partly eroded above or near sea level., Clastic materials produced by erosion of the andesite masses west of the district were deposited and intermingled with pyroclastic sediments in a complicated manner and show the marked influence of bottom currents.,
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  • Stratigraphy and Geological Structure of the Sanbagawa Crystalline Schist in the Northern Part of the Tenryu River District
    Isamu NAKAYAMA
    1953 Volume 59 Issue 698 Pages 497-509
    Published: November 25, 1953
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.59.497
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    The Sanbagawa crystalline schist of this district can be divided lithologically into the following formations., Yosizawa formation Black schist of pelitic origin, interbedded with some beds of green schist., Thickness : 350∼650m., Zihati formation Alternating beds of green schist (albite spotted and nones-potted) and black schist (albite spotted and nonspotted)., Thickness: 300∼700m., Wasanma formation Quartz schist; limestone schist; alternation of sericite schist, black schist and green schist beds., Thickness: 300∼400m., Sinkai formation Black schist., Thickness: 500∼600m., Hunayo formation Black schist., Thickness: 700m+., The Yosizaya and the Zihati formations are characterized by a folded structure which strikes east-west., Linear structures can be seen aligned east-west in the cleavage plane which is parallel to the bedding of the Yosizawa formation., The linear structures of the Zihati formation are aligned both east-west and north-south and are formed to the plane or cleavage which is parallel to the bedding plane., Parts of the wasanma and the Sinkai formation are characterized by east-west intraformational folding formed by slip movement in the cleavage plane, S1 parallel to the bedding plane., Linear structures can be seen aligned east-west on the cleavage plane S1, and parallel to the axis of the intraformational folds., In addition, north-south linear structures can be seen on the cleavage plane S2 which can b3 found in a position corresponding to that of the axial plane of the intraformational folds., The Hunayo formation and the lower Sinkai formation are characterized by a north-south structure., Linear structures are found oriented north-south within cleavage planes which are parallel to the bedding plane., Analysis of the linear structures in the crystalline schist formation of this area infers that the orogenic movement can be divided into the following two stages., 1st stage: A north-south differential movement or formations above the lower Sinkai formation and an east-west differential movement of formations below the lower Sinkai formation., Intrusion of the Tatuyama metadiabase sill into spaces between formations which had suffered separate differential movements., 2nd stage: An east-west differential movement throughout the whole Sanbagawa crystalline schist formation in this region.,
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  • Geotectonics of the Pacific Concerning the Japanese Islands : II., Geotectonics of Shikoku Referred to the Nankai Trench and the Nankaido Earthquake
    S. EHARA
    1953 Volume 59 Issue 698 Pages 510-526
    Published: November 25, 1953
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.59.510
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    [in Japanese]
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  • Some Notes on G., L., JEPSEN, E., MAYR and G., G., SIMPSON; Genetics, Paleontology and Evolution
    Shoji IJIRI
    1953 Volume 59 Issue 698 Pages 527a
    Published: November 25, 1953
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.59.527a
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  • A New Find of the So-called "Torinosu-limestone" from South of Yahatahama city, Ehime-Pref., Sikoku, Japan
    Jiro ABE
    1953 Volume 59 Issue 698 Pages 527b-527
    Published: November 25, 1953
    Released on J-STAGE: April 11, 2008
    DOIhttps://doi.org/10.5575/geosoc.59.527b
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