Database name: |
World Fe-oxide+/-Cu-Au-U (IOCG) deposits |
Compilers: |
Sunil S. Gandhi |
Release date: |
2015-03-04 |
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Deposit name(s): |
Kovdor; Yeno-Kovdor; Eno-Kovdor |
Political location(s): |
Russia; Province or state: Murmanskaya; Subprovince or locality: Murmansk; Nearest community: Kirovsk (130 km W) |
Deposit clan (type): |
Phalaborwa-type |
Deposit (sub) types: |
intrusion-hosted; the Kovdor intrusion similar to the Phalaborwa complex; ore body near margin to the southwest; magnetite coarse, with inclusions of silicates and spinel; ore occurs in steep bands, streaks and lenses; Reference: Sokolov, G. A.; Grigor'ev, V. M., 1977: Deposits of Iron; in Ore Deposits of the USSR, Volume 1, Edited by Smirnov, V. I., Academy of Science, the Union Soviet Socialist Republics, Pitman Publishing Ltd., Pitman House, 39 Parker Street, London WC2B 5PB, U. K., 352 p, p. 7 - 113 |
Deposit status: |
producer; Size category: 700 Mt; Status comments: open pit mining started in 1964; initial resources of 708 Mt averaging 50% magnetite and 16% apatite; baddeleyite as byproduct; vermiculite mined separately since 1974; minor chalcopyrite and pyrite |
Geologic province: |
Northern Baltic Shield |
Geologic subprovince: |
Kola Peninsula |
Geologic district: |
Murmansk |
Commodities: |
Fe; Ti; P; Zr; vermiculite; phlogopite |
Mineralization styles: |
veins, vertical; lenses, vertical; irregular bodies; bands, steep; streaks |
Geological ages: |
Middle Devonian (host rocks) Middle Devonian (mineralization) |
Tectonic setting: |
continental craton-intracratonic; stable; Formal name: Baltic Shield (host rocks) |
Coincident features: |
strongly differentiated pluton ('ore complex' 1.3 km long, 0.1-0.8 km wide, characterized by steep to vertical veins and lenses); Coincident feature name: Kovdor Intrusive Complex |
Regional tectonic structure: |
circular zoned intrusion with ultramafic core surrounded by alkaline rocks (polyphase intrusion; late stage carbonatite zone with ore in the southwestern part ) Tectonic structure name: Kovdor alkaline-carbonatite complex |
Host rocks: |
(1) intrusive; carbonatite-lamprophyre association (concentrically zoned intrusion); Magma series/sedimentary package/metamorphic group: alkaline; Depositional setting: continental; Metamorphic grade: noneExternal host rock forms: | crystalline, coarse | Internal host rock structures: | veins and segregations | Individual lithologies: | ijolite-pyroxenite (outer zone of the Kovdor complex; iolite, melteigite and nepheline-pyroxenite) tujaite-melilitite (second zone from the boundary; semicircular, early two-third of circle; absent on south-southwet side) ultrabasic (large inner zone of intrusion; pyroxene-nepheline-olivinite surounding olivinite core) magnetite-apatite-forsterite (ores zone in southwestern part of the Kovdor Complex, at western end of Kovdoro Lake) | Host rock stratigraphy: | Kovdor Intrusive Complex |
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Related igneous rocks: |
(1) intrusive; ultramafic suite (ultramafic-alkaline-carnoatite complex); Initials: Kovdor Igneous Complex; Magma series: alkaline; Depositional setting: continental |
Metallogenic signatures: |
Fe-Ti-P-Zr |
Alteration signatures: |
carbonatization: dolomite, calcite; What was altered: silicate minerals |
Mineralogy: |
(mineralization): magnetite, apatite, calcite, forsterite, phlogopite, franolite |
Deposit shape: |
irregularDeposit dimensions: | length: 1.3 kilometres width: 0.8 kilometres thickness: 0.7 kilometres |
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References: |
Notholt, A. J. G., 1979 |
The Economic Geology and Development of Igneous Phosphate Deposits in Europe and the USSR |
Economic Geology, Volume 74, p. 339 - 350 |
Sokolov, G. A.; Grigor'ev, V. M., 1977 |
Deposits of Iron |
in Ore Deposits of the USSR, Volume 1, Edited by Smirnov, V. I., Academy of Science, the Union Soviet Socialist Republics, Pitman Publishing Ltd., Pitman House, 39 Parker Street, London WC2B 5PB, U. K., 352 p, p. 7 - 113 |
Zitzmann, A., 1977 |
The Iron Ore Deposits of the Western U. S. S. R. |
Section The Iron Ore Deposits of Europe and Adjacent Areas, in The Iron Ore Deposits of Europe and Adjacent Areas: Explanatory Notes to the International Map of the Iron Ore Deposits of Europe, 1:2,500,000 (Text and Figures), Edited by Walther, H. W.; Zitzmann, A., International Geological Congress, Commission for the Geological Map of the World, Subcommission for the Metallogenic Map of the World, Bundesanstalt fur Geowissenschaften und Rohstoffe, Postfach 51 01 53, D-3000 Hannover 51, Volume I, 418 p, p. 325 - 391 |
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