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RISS 인기검색어
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- 저자 : Takeshi Nakamura(中村威) (검색결과 2 건)
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鑛物共生의 槪念에 對한 問題點과 鑛脈鑛床의 macrostructure
Moon Young Kim(金炆,榮),Takeshi Nakamura(中村威) 대한자원환경지질학회 1986 자원환경지질 Vol.19 No.5
Concepts on mineral association, mineral paragenesis, and mineralization stage relating to macrostructures of vein filling in ore veins are briefly discussed. As an example of plutonic ore vein, macrostructures of vein filling of plutonic tungsten-tin-copper vein at the Ohtani mine, Kyoto Prefecture, Japan, one of representatives of plutonic tungsten-tin vein related genetically to acidic magmatism of late Cretaceous in the Inner zone of Southwest Japan, are examined. Based on macrostructures of vein filling, three major mineralization stages, are distinguished by major tectonic breaks. Sequence of mineralization, characteristic features of each mineralization stage, and variations of filling temperature and salinity ranges of fluid inclusions in minerals from stage Ⅰ to stage Ⅲ are summarized.
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Moon Young Kim(金炆,榮),Nakamura Takeshi(中村威) 대한자원환경지질학회 1986 자원환경지질 Vol.19 No.1
The ore deposit of the Ohtani mine is one of representatives of plutonic tungsten-tin veins related genetically to acidic magmatism of Late Cretaceous in the Inner zone of Southwest Japan. Based on macrostructures of vein filling, three major mineralization stages are distinguished by major tectonic breaks. The constituents of ore minerals are scheelite, cassiterite, chalcopyrite, pyrrhotite, sphalerite, with small amounts of cubanite, stannite, galena, native bismuth, bismuthinite, arsenopyrite and pyrite. The relationship between the polymorphic variations of pyrrhotite and the kinds of the associated characteristic of ore mineral, in relation with hypogene mineralization, has been demonstrated. Pyrrhotite of stage Ⅰ is predominantly of the hexagonal phase (Hpo>Mpo). Pyrrhotite of stage Ⅱ is mainly of the monoclinic phase (Hpo≤Mpo). Pyrrhotite of stage Ⅲ is a single monoclinic phase (Hpo≪Mpo). The compositions of the hexagonal pyrrhotite decrease in Fe content ranging from 47.44 atom % Fe in stage Ⅰ to 46.88 atom % Fe in stage Ⅲ.
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