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The Narken iron oxide-(Cu) deposits: a link between Kiruna-type iron ore and IOCG-style of mineralization
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-0935-3430
2009 (English)In: Smart science for exploration and mining: proceedings of the 10th Biennial SGA Meeting, Townsville, Australia 17th-20th August / [ed] Patrick Williams, James Cook University of North Queensland , 2009Conference paper, Published paper (Refereed)
Abstract [en]

The Northern Norrbotten Ore Province is the type area for iron deposits of Kiruna-type (apatite iron ores). These deposits are mainly hosted by 1.9 Ga Svecofennian porphyries and occur as massive lenses or as breccia style of mineralisation in the Kiruna and Malmberget regions. Just outside this area an unusual type of apatite iron ore occur at Narken. Euhedral crystals of hematite altered magnetite, apatite, and pyrite occur as breccia infill together with tabular hematite, epidote, chlorite and some quartz. The occurrences of iron oxide mineralization are enriched in REE, and contain up to 0.5% Cu but are low in Au. The wall rocks and clasts of these rocks within the breccia bodies are strongly altered by silicification, epidotization and chloritization. Sulphur isotope data and mineral paragenesis indicate increasingly oxidizing conditions during development of the mineralization. Magnetite, apatite and pyrite are early formed minerals, transported to higher levels in the crust by a fluidized hydrothermal system and deposited in breccia bodies where they occur in a xenocrystic manner in a breccia infill of flaky hematite, epidote, chlorite, quartz and minor chalcopyrite. In many respects the Narken deposits are transitional in character to apatite iron ores and IOCG-style mineralization.

Place, publisher, year, edition, pages
James Cook University of North Queensland , 2009.
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-31919Local ID: 63e4ed90-be1d-11de-b769-000ea68e967bISBN: 9780980558685 (print)OAI: oai:DiVA.org:ltu-31919DiVA, id: diva2:1005153
Conference
Biennial SGA Meeting : 17/08/2009 - 20/08/2009
Note
Godkänd; 2009; 20091021 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-03-26Bibliographically approved

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