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Regional structural setting of late-orogenic IOCG mineralization along the northern Nautanen deformation zone, Norrbotten, Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1627-7058
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-8682-8180
2023 (English)In: Ore Geology Reviews, ISSN 0169-1368, E-ISSN 1872-7360, Vol. 163, article id 105814Article in journal (Refereed) Published
Abstract [en]

The northern Norrbotten ore province in Sweden is one of the most mineralized areas in Europe. Iron, gold and/or copper deposits occur as iron oxide-apatite-style mineralization (IOA, Kiruna-type) as well as iron oxide-copper–gold (IOCG) style. Regardless of mineralization style, most deposits appear to be spatially controlled by a set of crustal-scale Palaeoproterozoic shear zones which share similar structural characteristics and deformation histories.

Reappraisal of regional geological and geophysical data, coupled with structural mapping, suggests crustal-scale shear zones form continuous c. N-S-trending zones extending from the Skellefte district in the south into the northern Norrbotten ore province. One example from Norrbotten is a zone that extends SSW from Karesuando in the north towards Svappavaara. While this structure has traditionally been inferred to continue SW towards Arjeplog (i.e. the Karesuando – Arjeplog Deformation Zone; KADZ), we favour its deflection SSE into the Nautanen-Aitik trend, making it a continuous, IOCG-bearing, crustal-scale deformation zone. Similar shear zone geometries can be observed in analogous zones to the west. Most of these crustal scale structures record at least two time-separated deformation events of regional significance. IOA and IOCG deposits form in different tectonic environments, separated in time and overprinting each other.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 163, article id 105814
National Category
Earth and Related Environmental Sciences
Research subject
Ore Geology
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URN: urn:nbn:se:ltu:diva-104388DOI: 10.1016/j.oregeorev.2023.105814ISI: 001139738400001Scopus ID: 2-s2.0-85179624059OAI: oai:DiVA.org:ltu-104388DiVA, id: diva2:1841036
Note

Validerad;2024;Nivå 2;2024-03-07 (signyg);

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Available from: 2024-02-27 Created: 2024-02-27 Last updated: 2024-03-26Bibliographically approved

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Bauer, TobiasAndersson, Joel B.H.

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