長野県天龍村神豊太陽タングステン鉱床の地質と鉱化作用

DOI Web Site 参考文献12件
  • 田中 良
    Oshika Junior High School
  • 石山 大三
    Center for Geo-Environmental Science (CGES), Graduate School of Engineering and Resource Science, Akita University
  • 佐藤 比奈子
    Department of Earth Science and Technology Graduate School of Engineering and Resource Science, Akita University
  • 水田 敏夫
    International Center for Research and Education on Mineral and Energy Resources, Akita University

書誌事項

タイトル別名
  • Geology and mineralization of the Shimpo-Taiyo tungsten deposit, Tenryu Village, Nagano Prefecture
  • ナガノケンテンリュウムラシン ホウ タイヨウ タングステン コウショウ ノ チシツ ト コウカ サヨウ

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The Shimpo-Taiyo deposit is a wolframite-bearing quartz vein that is related to granites of the Ryoke Metamorphic Belt in Central Japan, which is considered to be barren province. The major ore minerals in the deposit are wolframite, chalcopyrite, pyrrhotite, sphalerite, WS2 component-bearing molybdenite and native bismuth. The geology around the deposit consists of roof pendants of Ryoke metamorphic rocks and late Cretaceous granite. The granite is an ilmenite-series granitic rock, which is classified into three different types, adamellite, which is distinguished as type A and type B; and granite, called type C. The granites around the deposit are garnet-bearing leucocratic coarse-grained type C granite. The wolframite quartz veins cut both type C granites and metamorphic rocks. Chemical compositions of major and trace elements of the granites show that type C is the most differentiated around the deposit. All of the fluid inclusions in the quartz from granites and ores from the deposit are liquid-rich two-phase fluid inclusions. The homogenization temperature of fluid inclusion from the granites is around 250~340 °C and that of the ore is around 260~340 °C. The average salinity is 2.4 wt% NaCl equivalent. Given the depth in which the deposits were formed, it is estimated that the filling temperature of the fluid was around 400~540 °C. Based on the geological features of the area, the mode of occurrence of mineralized veins, the chemical compositions of granite and the data from fluid inclusions, the Shimpo-Taiyo tungsten deposit is thought to have been formed by hydrothermal activity of the differentiated type C granite.

収録刊行物

  • 資源地質

    資源地質 62 (2), 125-138, 2012

    資源地質学会

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