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Regional structural setting of late-orogenic IOCG mineralization along the northern Nautanen deformation zone, Norrbotten, Sweden
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-1627-7058
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0001-8682-8180
2023 (engelsk)Inngår i: Ore Geology Reviews, ISSN 0169-1368, E-ISSN 1872-7360, Vol. 163, artikkel-id 105814Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2023. Vol. 163, artikkel-id 105814
HSV kategori
Forskningsprogram
Malmgeologi
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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
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Validerad;2024;Nivå 2;2024-03-07 (signyg);

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Tilgjengelig fra: 2024-02-27 Laget: 2024-02-27 Sist oppdatert: 2024-03-26bibliografisk kontrollert

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