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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Panasqueira ： ウィキペディア英語版 Panasqueira Panasqueira is one of the largest tungsten mines in the world. It is located in Covilhã, Castelo Branco, Portugal. ==Geology== The deposit is located in a region in which Precambrian shale, greywacke and sandstone units were intruded by the Panasquieira Granite. Contact metamorphism adjacent to the granite converted the shale into hornfels consisting of biotite, cordierite and andalusite. Quartz veins and masses were produced by regional metamorphism during the Hercynian orogeny. The upper part of the leucogranite batholith is associated with massive quartz greisen and veins within the hornfels and shale. Mineralisation in the deposit includes an oxide-silicate stage consisting of wolframite, cassiterite, arsenopyrite, topaz, muscovite and tourmaline. This was followed by sulfide mineralisation consisting of further arsenopyrite, pyrite, pyrrhotite, chalcopyrite, sphalerite and stannite. A late stage of calcite and dolomite with minor sulfide minerals ended the mineralisation event.〔(Panasquieira at Mindat.org )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Panasqueira」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.