Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions
Kiruna-type iron oxide-apatite (IOA) deposits are an important source of Fe ore, and two radically different processes are being actively investigated for their origin. One hypothesis invokes direct crystallization of immiscible Fe-rich melt that separated from a parent silicate magma, while the oth...
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ftmurdochuniv:oai:researchrepository.murdoch.edu.au:27697 2023-05-15T17:04:06+02:00 Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions Knipping, J.L. Bilenker, L.D. Simon, A.C. Reich, M. Barra, F. Deditius, A.P. Lundstrom, C. Bindeman, I. Munizaga, R. 2015 https://researchrepository.murdoch.edu.au/id/eprint/27697/ eng eng Geological Society of America https://researchrepository.murdoch.edu.au/id/eprint/27697/ full_text_status:none © 2015 Geological Society of America. Knipping, J.L., Bilenker, L.D., Simon, A.C., Reich, M., Barra, F., Deditius, A.P. <https://researchrepository.murdoch.edu.au/view/author/Deditius, Artur.html>, Lundstrom, C., Bindeman, I. and Munizaga, R. (2015) Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions. Geology, 43 (7). pp. 591-594. Journal Article 2015 ftmurdochuniv 2020-01-05T18:54:45Z Kiruna-type iron oxide-apatite (IOA) deposits are an important source of Fe ore, and two radically different processes are being actively investigated for their origin. One hypothesis invokes direct crystallization of immiscible Fe-rich melt that separated from a parent silicate magma, while the other hypothesis invokes deposition of Fe-oxides from hydrothermal fluids of either magmatic or crustal origin. Here, we present a new model based on Fe and O stable isotopes and trace and major element geochemistry data of magnetite from the ~350 Mt Fe Los Colorados IOA deposit in the Chilean iron belt that merges these divergent processes into a single sequence of events that explains all characteristic features of these curious deposits. We propose that concentration of magnetite takes place by the preferred wetting of magnetite, followed by buoyant segregation of these earlyformed magmatic magnetite-bubble pairs, which become a rising magnetite suspension that deposits massive magnetite in regionalscale transcurrent faults. Our data demonstrate an unambiguous magmatic origin, consistent with the namesake IOA analogue in the Kiruna district, Sweden. Further, our model explains the observed coexisting purely magmatic and hydrothermal-magmatic features and allows a genetic connection between Kiruna-type IOA and iron oxide-copper-gold deposits, contributing to a global understanding valuable to exploration efforts. Article in Journal/Newspaper Kiruna Murdoch University: Murdoch Research Repository Kiruna |
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Murdoch University: Murdoch Research Repository |
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English |
description |
Kiruna-type iron oxide-apatite (IOA) deposits are an important source of Fe ore, and two radically different processes are being actively investigated for their origin. One hypothesis invokes direct crystallization of immiscible Fe-rich melt that separated from a parent silicate magma, while the other hypothesis invokes deposition of Fe-oxides from hydrothermal fluids of either magmatic or crustal origin. Here, we present a new model based on Fe and O stable isotopes and trace and major element geochemistry data of magnetite from the ~350 Mt Fe Los Colorados IOA deposit in the Chilean iron belt that merges these divergent processes into a single sequence of events that explains all characteristic features of these curious deposits. We propose that concentration of magnetite takes place by the preferred wetting of magnetite, followed by buoyant segregation of these earlyformed magmatic magnetite-bubble pairs, which become a rising magnetite suspension that deposits massive magnetite in regionalscale transcurrent faults. Our data demonstrate an unambiguous magmatic origin, consistent with the namesake IOA analogue in the Kiruna district, Sweden. Further, our model explains the observed coexisting purely magmatic and hydrothermal-magmatic features and allows a genetic connection between Kiruna-type IOA and iron oxide-copper-gold deposits, contributing to a global understanding valuable to exploration efforts. |
format |
Article in Journal/Newspaper |
author |
Knipping, J.L. Bilenker, L.D. Simon, A.C. Reich, M. Barra, F. Deditius, A.P. Lundstrom, C. Bindeman, I. Munizaga, R. |
spellingShingle |
Knipping, J.L. Bilenker, L.D. Simon, A.C. Reich, M. Barra, F. Deditius, A.P. Lundstrom, C. Bindeman, I. Munizaga, R. Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
author_facet |
Knipping, J.L. Bilenker, L.D. Simon, A.C. Reich, M. Barra, F. Deditius, A.P. Lundstrom, C. Bindeman, I. Munizaga, R. |
author_sort |
Knipping, J.L. |
title |
Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
title_short |
Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
title_full |
Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
title_fullStr |
Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
title_full_unstemmed |
Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
title_sort |
giant kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions |
publisher |
Geological Society of America |
publishDate |
2015 |
url |
https://researchrepository.murdoch.edu.au/id/eprint/27697/ |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
Knipping, J.L., Bilenker, L.D., Simon, A.C., Reich, M., Barra, F., Deditius, A.P. <https://researchrepository.murdoch.edu.au/view/author/Deditius, Artur.html>, Lundstrom, C., Bindeman, I. and Munizaga, R. (2015) Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions. Geology, 43 (7). pp. 591-594. |
op_relation |
https://researchrepository.murdoch.edu.au/id/eprint/27697/ full_text_status:none |
op_rights |
© 2015 Geological Society of America. |
_version_ |
1766058133253259264 |