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Global Fe–O isotope correlation reveals magmatic origin of Kiruna-type apatite-iron-oxide ores
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, no 1Article 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 low-temperature 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 δ56Fe and δ18O ratios that overlap with the volcanic and plutonic reference materials (> 800 °C), whereas ~20%, mainly vein-hosted and disseminated magnetite, match the low-temperature reference samples (≤400 °C). Thus, Kiruna-type ores are dominantly magmatic in origin, but may contain late-stage hydrothermal magnetite populations that can locally overprint primary high-temperature magmatic signatures.

Place, publisher, year, edition, pages
2019. Vol. 10, no 1
National Category
Earth and Related Environmental Sciences
Research subject
The changing Earth
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URN: urn:nbn:se:nrm:diva-3654DOI: 10.1038/s41467-019-09244-4OAI: oai:DiVA.org:nrm-3654DiVA, id: diva2:1379539
Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Publisher's full texthttps://doi.org/10.1038/s41467-019-09244-4

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