東濃ウラン鉱床月吉鉱体の重鉱物組成

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タイトル別名
  • Heavy minerals in the Tsukiyoshi orebody, Tono uranium deposit, central Japan
  • トウノウ ウラン コウショウゲツ キチコウタイ ノ ジュウ コウブツ ソセイ

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Heavy minerals are examined in uranium ores and the associated rocks of the Tsukiyoshi orebody, Tono sandstone-type uranium deposit, central Japan. The samples used are uranium ores hosted in the Toki Lignite-bearing Formation, sandstones taken from a series of a stratigraphic succession, i.e., Toki Lignite-bearing, Hongo and Akeyo Formations in the Miocene Mizunami Group, in ascending order, and late Cretaceous to Paleogene basement granitic rocks. Amounts of heavy minerals are counted under a microscope for non-magnetic fractions with the specific gravity of >2.85 and the diameter from 0.0625 to 0.125 millimeter.<br>Heavy minerals in the uranium ores are composed mainly of biotite, green hornblende and opaque minerals, with minor clinopyroxene, epidote, zircon and brown hornblende. One ore sample contains topaz, cassiterite, garnet and allanite. Heavy minerals in the non-mineralized sandstone from the Toki Lignite-bearing Formation consist mainly of green hornblende and opaque minerals, with some clinopyroxene and orthopyroxene and minor brown hornblende, apatite, epidote and anatase. The sandstones from Hongo and Akeyo Formations contain clinopyroxene, orthopyroxene and opaque minerals. Heavy minerals in basement granitic rocks are composed mainly of biotite with some opaque mineral, zircon, fluorite, epidote and anatase.<br>On the basis of comparison of heavy mineral composition of rocks around the Tsukiyoshi orebody, three sources of detritus are estimated, i.e., (1) granitic source composed mainly of biotite, zircon and fluorite, (2) volcanic ash source of hornblendes and pyroxenes and (3) pegmatitic and hydrothermal sources of topaz and cassiterite. Uranium ores are proved to be embedded in the detritus mainly of granitic source, whereas the other sandstones in the Mizunami Group are mainly from volcanic source. Topaz and cassiterite in the ores are estimated to be derived from the pegmatitic and hydrothermal deposits with the Naegi granite developed at the northeastern side of the Tsukiyoshi orebody.

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  • 資源地質

    資源地質 62 (3), 225-233, 2012

    資源地質学会

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