Radiometric ages: |
Object dated: Host Rocks(1); Age - Ma: 1,880; +20; -20; Dating method: U-Pb; Concentrate: zircon; Source rock: rhyolite; Formal name: hanging wall sequence; Event dated: host rock; Interpretive comment: age represents the time of felsic extrusive activity and formation of Kirunavaara deposit; Reference: Welin, E., 1987: The Depositional Evolution of the Svecofennian Supracrustal Sequence in Finland and Sweden; Precambrian Research, Volume 35, p. 95 - 113
Object dated: Related igneous rocks; Age - Ma: 1,880; +3; -3; Dating method: U-Pb; Concentrate: zircon; Source rock: granite; Formal name: Kiruna Mine series; Event dated: post-mineralization; Interpretive comment: granophyric dykes related to this granite intrusive cut the Kirunavaara deposit; Reference: Cliff, R. A.; Rickard, D.; Blake, K., 1990: Isotopic Systematics of the Kiruna Magnetite Ores, Sweden. Part I. Age of the Ore; Economic Geology, Volume 85, p. 1770 - 1776
Object dated: Related igneous rocks; Age - Ma: 1,880; +35; -35; Dating method: U-Pb; Concentrate: zircon; Source rock: granophyric dyke; Formal name: post-ore dyke; Event dated: post-mineralization; Interpretive comment: minimum age of the Kirunavaara deposit; Reference: Cliff, R. A.; Rickard, D.; Blake, K., 1990: Isotopic Systematics of the Kiruna Magnetite Ores, Sweden. Part I. Age of the Ore; Economic Geology, Volume 85, p. 1770 - 1776
Object dated: Host Rocks; Age - Ma: 1,890; +90; -90; Dating method: Sm-Nd; Concentrate: whole rock; Source rock: host volcanics and related intrusives; Formal name: Kiruna Mine series and intrusives; Event dated: host rock; Interpretive comment: age of the host volcanic sequence and related high level intrusions; Reference: Cliff, R. A.; Rickard, D.; Blake, K., 1990: Isotopic Systematics of the Kiruna Magnetite Ores, Sweden. Part I. Age of the Ore; Economic Geology, Volume 85, p. 1770 - 1776
Object dated: Country Rocks; Age - Ma: 1,930; +50; -50; Dating method: Sm-Nd; Concentrate: whole rock; Source rock: basaltic flows; Formal name: Kiruna greenstones; Event dated: pre-mineralization; Interpretive comment: maximum age for the Kiruna Mine series which unconformably overlies the metabasalts dated; Reference: Skiold, T.; Cliff, R. A., 1984: Sm, Nd and U-Pb Dating of Early Proterozoic Mafic Felsic Volcanism in Northernmost Sweden; Precambrian Research, Volume 26, p. 1 - 13
Object dated: Host Rocks(2); Age - Ma: 1,876; +9; -9; Dating method: U-Pb; Concentrate: titanite; Source rock: footwall of Kiirunavaara deposit; Formal name: alteration event ; Event dated: post-mineralization (alteration); Interpretive comment: titanite-actinolite-calcite amygdules in the footwall represent alteration related to a syenite sill; Reference: Romer, R. L.; Martinsson, O.; Perdahl, J. A., 1994: Geochronology of the Kiruna Ores and Hydrothermal Alterations; Economic Geology, Volume 89, p. 1249 - 1261
Object dated: Mineralogy; Age - Ma: 1,888; +6; -6; Dating method: U-Pb; Concentrate: titanite; Source rock: magnetite-titanite dyke; Formal name: ore formation event; Event dated: mineralization; Interpretive comment: the dyke dated is from the Luossavaara deposit 1 km N along strike of the Kiirunavaara deposit; Reference: Romer, R. L.; Martinsson, O.; Perdahl, J. A., 1994: Geochronology of the Kiruna Ores and Hydrothermal Alterations; Economic Geology, Volume 89, p. 1249 - 1261 |
References: |
Anonymous, 2000 |
Swedish Database of Mineral Deposits |
Email |
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Isotopic Systematics of the Kiruna Magnetite Ores, Sweden. Part I. Age of the Ore |
Economic Geology, Volume 85, p. 1770 - 1776 |
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