Also known as stratified copper-bearing iron sulfide deposits or Besshi-type deposits. An important copper resource. A layered or lenticular deposit consisting of dense, massive ores, mainly pyrite and pyrrhotite, always containing some chalcopyrite, that coherently exists in rock strata. Some also contain significant amounts of sphalerite or galena. Most are found in metamorphic belts. The origin is thought to be the metamorphism of ore layers formed by undersea volcanic activity. The Rammelsberg mine in Germany and the Slitelma mine in Norway are well-known examples. In Japan, the Besshi mine and Sazare mine in Ehime Prefecture, the Shirataki mine in Kochi Prefecture, and the Hitachi mine in Ibaraki Prefecture are good examples, but they are no longer in operation. → Related topics Ore deposits | Ore layers | Metamorphic deposits Source : Heibonsha Encyclopedia About MyPedia Information |
層状含銅硫化鉄鉱床,別子式鉱床とも。重要な銅資源の一つ。黄鉄鉱・磁硫鉄鉱を主体とし,常にいくらかの黄銅鉱を含有する緻密(ちみつ)で塊状の鉱石からなり,岩層中に整合的に存在する層状ないしレンズ状の鉱床。相当量のセン亜鉛鉱あるいは方鉛鉱を伴うものもある。多くは変成帯に分布。成因は,海底火山作用に伴って形成された鉱層が,変成作用を受けたものであると考えられる。ドイツのランメルスベルク鉱山,ノルウェーのスリテルマ鉱山などが著名。日本では愛媛県別子鉱山・佐々連(さざれ)鉱山,高知県白滝鉱山,茨城県日立鉱山などが好例だったが,現在は稼行されていない。 →関連項目鉱床|鉱層|変成鉱床 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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