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  • 河内 洋佑
    地質学雑誌
    1968年 74 巻 12 号 607-616_4
    発行日: 1968/12/25
    公開日: 2008/04/11
    ジャーナル フリー
  • 土井 正民
    鉱山地質
    1959年 9 巻 35 号 137-149
    発行日: 1959/06/30
    公開日: 2009/06/12
    ジャーナル フリー
    The Sazare Mine is located east of the Besshi Mine. It was operated almost continuously from 1930 to 1945 under various cwners and milled 4, 500 t pm of ore containing 1.5% copper.
    Later prospecting activities by the Sumitomo Metal Mining Co., Ltd. have been encouraging. In 1953, new ore bodies were discovered by extensive diamond drilling and as the result of development and exploration, it was found that the ore bodies, having an en echelon arrangement, have mutual continuity as mineralized layers. Both sides of the ore bodies can be traced for distances of about 2, 500m. From outcrops to deep levels, the west ore bodies contain more copper, a mine having an output of 350t pm in copper falls into the rank of an important mine in Japan. The bedded cupriferous pyritic deposits of the mine are found in a series of highly schistose green rocks belonging to the Yoshinogawa formation which are believed to be of pre-Carboniferous age (the Sambagawa metamorphic rocks), and lie on the south limb of the main anticline, called the Yakushi anticline. The present form of the ore bodies was controlled by a main and minor fold of different orientations which were formed after the deposition of the original, bedded, mineralized alyers. The direction of pitch of ore bodies is SW and coincides with that of the ores of the minor fold.
  • 大槻 憲四郎
    地質学雑誌
    1993年 99 巻 6 号 431-441
    発行日: 1993/06/15
    公開日: 2008/04/11
    ジャーナル フリー
  • 土井 正民
    鉱山地質
    1961年 11 巻 50 号 610-626
    発行日: 1961/12/25
    公開日: 2009/12/14
    ジャーナル フリー
    The writer, as a resident geologist, has been engaged in surveying and prospecting in the Besshf and Sazare mines in the Sanbagawa metamorphic zone, central Shikoku.
    This area of the Sanbagawa series is composed of the oldest rocks, represented by the crystalline schists which comprise green schists, graphite schist, schistose sandstone and quartz schist. The green schists include epidote-chlorite schist, spotted chlorite schist, epidote-amphibole schist and spotted. amphibole schist.
    In regard to the geologic structure of this area, there are two anticline-axes and one main syncline-axes running N 75°W. They are called the Yakushi anticline-axis, the Tomisato syncline-axis and the-Nakahichiban anticline-axis from north to south. Between the above anticline-axes, there is a large bilge, the so-called Tomisato syncline. According to the relations between the present topography and. the abovementioned geologic structures of this area the surface geology shows apparently a big sigmoid. form.
    The metamorphic zone is composed of the following formations and is divided into some subzones by their metamorphic grade :
    Name of formation
    (upper) Tomisato
    Minawa{upper middle lower
    Koboke
    Kawaguchi
    (Lower) Oboke
    Thickness
    800m
    4, 500m
    500m
    1, 200m
    1, 500m
    Metamorphic grade
    high high middle}spotted zone
    low low low low}non-spotted zone
    Many bedded cupriferous pyrite deposits are found in the Kawaguchi and the Minawa formations, but the famous ore-deposits, for example, the Besshi, the Sazare and the Shirataki deposits, belong to the latter formation. The Besshi mine, above all, having had the output of 650, 000 tons of copper during the past 270 years, is well known as a representative of the Besshi type copper deposits or Kieslager type in Japan. Recently the Sazare mine has made a remarkable progress as a result of positive prospecting.
    Scince 1895 the geneses of the ore-deposits of the Besshi type has been discussed by many geologists, from 1895 to 1910 syngenetic theories prevailed, and after 1910 up to date epigenetic theories have been advocated.
    The prospecting policy for mine-working has applied with various methods under the influence of the genetic theories. Judging from the result of these prospectings, it seems effective to trace the horizon in which the ore-deposits occur from the standpoint, of a. syngenetic. theory which is related to the geologic structure.
    By the fact that the Besshi deposits on the north limb of the Nakahichiban anticline and the Sazare deposits on south limb of the Yakushi anticline are situated opposits to each other in the center of the Tomisato syncline, the. prospecting policy has come to bear importance in discovery of blind bedded. ore deposits belonging to the Minawa formation; having the accumulation of the intense submarine volcanic activities below the Tomisato Syncline.
  • 畠山 秀樹
    経営史学
    1986年 21 巻 4 号 61-87
    発行日: 1987/01/30
    公開日: 2010/11/18
    ジャーナル フリー
  • 板谷 徹丸
    地質学雑誌
    1999年 105 巻 12 号 881-894
    発行日: 1999/12/15
    公開日: 2008/04/11
    ジャーナル フリー
    K-Ar年代の微量・迅速測定法を開発した経緯を説明し, その方法を日本列島の地質年代学へ応用した研究をまとめた.具体的には, 新生代後期の火山体の火山層序の確立や付加体中の年代未詳地質体の年代測定と構造復元に適用された.また, 低温高圧型および高温低圧型変成帯の年代パターン解析にも応用された.この種の方法の基礎は地質体から系統的に試料を採集し, そこから分離した鉱物のK-Ar年代測定である.それは変成帯などの年代マッピングを意味し, 全く新しい手法である.この年代マッピング法は世界の主要な造山帯にも適用され, 注目すべき結果を提供した.
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