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Global Fe-O isotope correlation reveals magmatic origin of Kiruna-type apatite-iron-oxide ores
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Swedish Museum Nat Hist, Dept Geosci, Frescativagen 40, S-11418 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Geol Survey Sweden, Dept Mineral Resources, Villavagen 18,Box 670, S-75128 Uppsala, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Luossavaara Kiirunavaara AB, Res & Dev, FK9, S-98186 Kiruna, Sweden.
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 1712Article in journal (Refereed) Published
Abstract [en]

Kiruna-type apatite-iron-oxide ores are key iron sources for modern industry, yet their origin remains controversial. Diverse ore-forming processes have been discussed, comprising lowtemperature hydrothermal processes versus a high-temperature origin from magma or magmatic fluids. We present an extensive set of new and combined iron and oxygen isotope data from magnetite of Kiruna-type ores from Sweden, Chile and Iran, and compare them with new global reference data from layered intrusions, active volcanic provinces, and established low-temperature and hydrothermal iron ores. We show that approximately 80% of the magnetite from the investigated Kiruna-type ores exhibit d56Fe and d18O ratios that overlap with the volcanic and plutonic reference materials (> 800 degrees C), whereas similar to 20%, mainly vein-hosted and disseminated magnetite, match the low-temperature reference samples (<= 400 degrees C). Thus, Kiruna-type ores are dominantly magmatic in origin, but may contain latestage hydrothermal magnetite populations that can locally overprint primary hightemperature magmatic signatures.

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NATURE PUBLISHING GROUP , 2019. Vol. 10, article id 1712
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Geology
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URN: urn:nbn:se:uu:diva-382552DOI: 10.1038/s41467-019-09244-4ISI: 000464338100023PubMedID: 30979878OAI: oai:DiVA.org:uu-382552DiVA, id: diva2:1314863
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Swedish Research CouncilAvailable from: 2019-05-10 Created: 2019-05-10 Last updated: 2019-05-10Bibliographically approved

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