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Magmatic origin of ...
Magmatic origin of giant 'Kiruna-type' apatite-iron-oxide ores in Central Sweden
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- Jonsson, Erik (author)
- Uppsala universitet,Berggrundsgeologi
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- Troll, Valentin R. (author)
- Uppsala universitet,Berggrundsgeologi
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- Högdahl, Karin (author)
- Uppsala universitet,Berggrundsgeologi
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Harris, Chris (author)
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- Weis, Franz (author)
- Uppsala universitet,Berggrundsgeologi
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Nilsson, Katarina P. (author)
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- Skelton, Alasdair (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper
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(creator_code:org_t)
- 2013-04-10
- 2013
- English.
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 3, s. 1644-
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Iron is the most important metal for modern industry and Sweden is by far the largest iron-producer in Europe, yet the genesis of Sweden's main iron-source, the 'Kiruna-type' apatite-iron-oxide ores, remains enigmatic. We show that magnetites from the largest central Swedish 'Kiruna-type' deposit at Grangesberg have delta O-18 values between -0.4 and +3.7%, while the 1.90-1.88 Ga meta-volcanic host rocks have d18O values between +4.9 and +9%. Over 90% of the magnetite data are consistent with direct precipitation from intermediate to felsic magmas or magmatic fluids at high-temperature (delta O-18(mgt). > +0.9 parts per thousand, i.e. ortho-magmatic). A smaller group of magnetites (delta O-18(mgt) <= +0.9 parts per thousand), in turn, equilibrated with high-delta O-18, likely meteoric, hydrothermal fluids at low temperatures. The central Swedish 'Kiruna-type' ores thus formed dominantly through magmatic iron-oxide precipitation within a larger volcanic superstructure, while local hydrothermal activity resulted from low-temperature fluid circulation in the shallower parts of this system.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
Publication and Content Type
- ref (subject category)
- art (subject category)
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