Germanium-bearing Colusite from the Yanahara Mine, Japan, and Its Significance to Ore Genesis

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  • KASE Katsuo
    Department of Earth Sciences, Faculty of Science, Okayama University
  • YAMAMOTO Masahiro
    Department of Earth Sciences, Faculty of Science, Okayama University
  • MITSUNO Chiharu
    Department of Earth Sciences, Faculty of Science, Okayama University

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Other Title
  • 柵原鉱山におけるGeを含むコルース鉱の産出とその鉱床成因論的意義
  • ヤナハラ コウザン ニ オケル Ge オ フクム コルースコウ ノ サンシュツ

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Description

Colusite, Cu26V2(As, Ge)6S32, containing up to 4.3 wt.% Ge occurs with pyrite, chalcopyrite and bomite in sphalerite-barite-rich ores of the volcanogenic massive sulfide orebody at Hinotani L-1, the Yanahara mine. Electron microprobe analysis reveals that As and V are pentavalent and Ge is tetravalent in the mineral the same as in germanite and renierite, suggesting that the Ge-bearing colusite was precipitated under high fs2 and fo2 conditions. These Ge-bearing minerals sometimes occur in the Kuroko deposits related with felsic volcanism, associated with pyrite, chalcopyrite and bomite as at Hinotani, while practically no Ge-bearing minerals occur in the Besshi-type deposits related with mafic volcanism. It is concluded that the ore solutions responsible for the Hinotani L-1 orebody and possibly for whole orebodies at Yanahara are related with felsic volcanism.

Journal

  • Shigen-Chishitsu

    Shigen-Chishitsu 44 (243), 33-38, 1994

    The Society of Resource Geology

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