Geology of the Nautanen North Cu-Au-Ag-(Mo) Deposit, Norrbotten, Sweden

IF 5.5 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
David Drejing-Carroll, Murray W. Hitzman, David Coller
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引用次数: 0

Abstract

Abstract The Nautanen North deposit in the Gällivare-Malmberget area of Norrbotten, Sweden, currently contains a resource of 21 Mt at 1.46% Cu, 0.78 g/t Au, 6 g/t Ag, and 99 g/t Mo and remains open at depth and along strike. This study, based on extensive examination of drill core, geochemical data, and petrographic analyses, represents the first comprehensive description of the structural controls, hydrothermal alteration facies and paragenetic sequence of mineral precipitation, and styles and relative timing of iron oxide and sulfide mineralization at the deposit. The deposit is localized between bounding shear zones within the Nautanen deformation zone. High grades of Cu occur within discrete zones of brecciation and veining and as mineralized shear bands. Breccias in the northern portion of the deposit developed within a vertically stacked, relay-like zone in response to late deformation. Hydrothermal alteration of the host rocks was initially dominated by Na facies alteration, which was subsequently overprinted by Na-Ca-Fe, HT (high-temperature) Ca-Fe, HT Ca-K-Fe, HT K-Fe, and LT (low-temperature) K-Fe facies alteration. Magnetite mineralization occurred in at least two phases: an early phase during Na and Na-Ca-Fe facies alteration accompanied by apatite that is interpreted to reflect a distal signature of formation of the proximal Malmberget magnetite-apatite deposit and a later phase coincident with HT Ca-Fe to K-Fe alteration, which overlapped with the onset of Cu and Fe sulfide mineralization under HT Ca-K-Fe and K-Fe and LT K-Fe conditions. The Nautanen North deposit is shown to meet key criteria to be classified as an iron oxide-copper-gold deposit.
瑞典诺博滕 Nautanen North 铜-金-镁(钼)矿藏的地质情况
瑞典Norrbotten Gällivare-Malmberget地区的Nautanen North矿床目前含Cu 1.46%, Au 0.78 g/t, Ag 6 g/t, Mo 99 g/t,资源量为21 Mt,在深度和走向上保持开放状态。本研究基于大量岩心、地球化学资料和岩石学分析,首次全面描述了矿床的构造控制、热液蚀变相和矿物沉淀共生序列,以及氧化铁和硫化物成矿的样式和相对时间。该矿床位于纳塔南变形带内的边界剪切带之间。高品位的铜赋存于角化和脉状的离散带和矿化剪切带中。矿床北部角砾岩发育在一个垂直堆积的继电器状带内,是对晚期变形的响应。储集岩热液蚀变初期以Na相蚀变为主,随后复盖Na-Ca-Fe、HT(高温)Ca-Fe、HT Ca-K-Fe、HT K-Fe、LT(低温)K-Fe相蚀变。磁铁矿成矿至少发生在两个阶段:早期发生在Na和Na-Ca-Fe相蚀变期间,伴有磷灰石,这反映了Malmberget磁铁矿-磷灰石矿床形成的远端特征;晚期发生在高温Ca-Fe到K-Fe蚀变期间,与高温Ca-K-Fe、K-Fe和LT K-Fe条件下的Cu和Fe硫化物成矿发生重叠。研究表明,南塔南北金矿床具有铁-铜-金矿床的特征。
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来源期刊
Economic Geology
Economic Geology 地学-地球化学与地球物理
CiteScore
10.00
自引率
6.90%
发文量
120
审稿时长
6 months
期刊介绍: The journal, now published semi-quarterly, was first published in 1905 by the Economic Geology Publishing Company (PUBCO), a not-for-profit company established for the purpose of publishing a periodical devoted to economic geology. On the founding of SEG in 1920, a cooperative arrangement between PUBCO and SEG made the journal the official organ of the Society, and PUBCO agreed to carry the Society''s name on the front cover under the heading "Bulletin of the Society of Economic Geologists". PUBCO and SEG continued to operate as cooperating but separate entities until 2001, when the Board of Directors of PUBCO and the Council of SEG, by unanimous consent, approved a formal agreement of merger. The former activities of the PUBCO Board of Directors are now carried out by a Publications Board, a new self-governing unit within SEG.
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