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Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1583-502x
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-8682-8180
Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-0935-3430
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2022 (English)In: Minerals, E-ISSN 2075-163X, Vol. 12, no 7, article id 875Article in journal (Refereed) Published
Abstract [en]

The Kiruna mining district, Sweden, known for the type locality of Kiruna-type iron oxide-apatite (IOA) deposits, also hosts several Cu-mineralized deposits including iron oxide-copper-gold (IOCG), exhalative stratiform Cu-(Fe-Zn), and structurally controlled to stratabound Cu +/- Au. However the relationship between the IOA and Cu-systems has not been contextualized within the regional tectonic evolution. A broader mineral systems approach is taken to assess the timing of energy drive(s) within a regional tectonic framework by conducting U-Pb zircon geochronology on intrusions from areas where Cu-mineralization is spatially proximal. Results unanimously yield U-Pb ages from the early Svecokarelian orogeny (ca. 1923-1867 Ma including age uncertainties), except one sample from the Archean basement (2698 +/- 3 Ma), indicating that a distinct thermal drive from magmatic activity was prominent for the early orogenic phase. A weighted average Pb-207/Pb-206 age of 1877 +/- 10 Ma of an iron-oxide-enriched gabbroic pluton overlaps in age with the Kiirunavaara IOA deposit and is suggested as a candidate for contributing mafic signatures to the IOA ore. The results leave the role of a late energy drive (and subsequent late Cu-mineralization and/or remobilization) ambiguous, despite evidence showing a late regional magmatic-style hydrothermal alteration is present in the district.

Place, publisher, year, edition, pages
MDPI, 2022. Vol. 12, no 7, article id 875
Keywords [en]
Kiruna, mineral system, U-Pb zircon geochronology, IOA, IOCG
National Category
Geophysics Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-92436DOI: 10.3390/min12070875ISI: 000833356600001Scopus ID: 2-s2.0-85137380223OAI: oai:DiVA.org:ltu-92436DiVA, id: diva2:1686837
Funder
EU, Horizon 2020, 776804Swedish Research Council, 2017-00671
Note

Validerad;2022;Nivå 2;2022-08-11 (hanlid)

Available from: 2022-08-11 Created: 2022-08-11 Last updated: 2024-01-17Bibliographically approved

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Logan, LeslieAndersson, Joel B. H.Martinsson, OlofBauer, Tobias E.

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