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Lithology, alteration and mineralization of the Fishtie Cu-Co deposit, Zambian Copperbelt
https://doi.org/10.20569/00005829
https://doi.org/10.20569/00005829b76062d5-d443-476c-b5bd-5facc2de1454
| 名前 / ファイル | ライセンス | アクション |
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内容要旨及び審査結果要旨 (225.5 kB)
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本文 (6.0 MB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||||
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| 公開日 | 2021-11-18 | |||||||
| タイトル | ||||||||
| タイトル | Lithology, alteration and mineralization of the Fishtie Cu-Co deposit, Zambian Copperbelt | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| ID登録 | ||||||||
| ID登録 | 10.20569/00005829 | |||||||
| ID登録タイプ | JaLC | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| 別タイトル | ||||||||
| その他のタイトル | ザンビア銅鉱化帯フィシテ銅コバルト鉱床の岩相，変質と鉱化作用 | |||||||
| 作成者 |
MUKUKA, SIMUSOKWE
× MUKUKA, SIMUSOKWE
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| 内容記述（抄録） | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | Fishtie is a copper-rich deposit situated southeast of the Zambian Copperbelt (ZCB), about 30 km north of Mkushi town, close to the international boundary between Zambia and the Democratic Republic of Congo. The deposit was discovered in 2004 by First Quantum Minerals (FQM) Limited through systematic application of soil geochemistry, magnetic survey and drilling. This drilling intersected 300 meters wide by over a kilometre long east-west striking copper orebody similar to the ZCB deposits, but hosted at a higher stratigraphic position in the Katanga Supergroup. The reserves are estimated at 55 Mt of copper at an average grade of 1.04%, occurring as oxide, sulfide and mixed oxide-sulfide ores. Cobalt-rich orebodies are present within the copper orebody, but the two metals show different vertical enrichment and depletion trends. This study was conducted to investigate the following geological characteristics of the Fishtie deposit: (1) the source of the metals, especially copper and cobalt; (2) the source of sulfur; (3) the physical and chemical characteristics of the lithology that are responsible for copper and cobalt mineralization; (4) the timing of mineralization; and (5) the factors controlling the spatial distribution of copper and cobalt metals. Petrographic results of samples from the Grand Conglomérat Formation sitting on the basement rocks shows chalcopyrite preferentially disseminated in chlorite-rich clasts. These clasts weathered from basement mafic rocks and are considered to be the source of copper and cobalt. Copper and cobalt were leached from detrital mafic minerals during hydrothermal alteration and metamorphism, resulting in decomposition of clasts to chlorite and chalcopyrite. Mineral chemistry of alteration minerals suggest that copper and cobalt were liberated as ions during the alteration of chlorite to biotite. The metal ions were transported to the site of deposition through post-folding faults which provided conduits for the oxidizing mineralizing fluids. Copper and cobalt precipitated as chalcocite, bornite, chalcopyrite, cobaltite and carrollite at the boundary of dolostone and reduced beds of alternating siltstone and sandstone. High-grade copper mineralization of chalcopyrite and bornite formed in folded beds of alternating siltstone and sandstone which acted as traps for mineralizing fluids and hydrocarbons. Copper and cobalt mineralization is zoned from deeper level sulfide mineralization to a shallow supergene mineralization of chalcocite, malachite, heteroginite and cobaltoan dolomite. |
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| 著者版フラグ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| 書誌情報 | 発行日 2021-09-24 | |||||||
| 出版者 | ||||||||
| 出版者 | 秋田大学 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（資源学） | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 11401 | |||||||
| 学位授与機関名 | 秋田大学 | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2021-09-24 | |||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第1392号 | |||||||
