Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden
The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-...
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Luleå tekniska universitet, Geovetenskap och miljöteknik
2022
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ftluleatu:oai:DiVA.org:ltu-88406 2023-05-15T17:04:06+02:00 Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden Logan, Leslie 2022 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-88406 eng eng Luleå tekniska universitet, Geovetenskap och miljöteknik Luleå Licentiate thesis / Luleå University of Technology, 1402-1757 orcid:0000-0003-1583-502x http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-88406 urn:isbn:978-91-7790-995-8 urn:isbn:978-91-7790-996-5 info:eu-repo/semantics/openAccess Kiruna tectonic framework mineral system IOCG IOA remobilization sulfur isotopes trace elements geochronology Pahtohavare Viscaria Rakkurijärvi Geology Geologi Licentiate thesis, comprehensive summary info:eu-repo/semantics/masterThesis text 2022 ftluleatu 2022-10-25T20:58:12Z The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-Zn) (Viscaria, Eastern Pahtohavare), epigenetic stratabound Cu ± Au (Pahtohavare), and iron oxide-copper-gold (IOCG, Rakkurijärvi) deposits. However, the timing of IOA versus IOCG within the tectonic evolution is in question based on structural investigations showing Cu- and Fe-sulfides occur in late-orogenic structures. Here we use an established tectonic framework to constrain mineral systems (tectonic/thermal drives, metal and ligand sources, fluid pathways, traps, remobilization mechanisms) related to the early and late phases of the Svecokarelian orogeny in the Kiruna mining district. U-Pb zircon geochronology of intrusions in the district indicates a thermal drive was present during the early phase of the Svecokarelian orogeny from ca. 1920-1865 Ma, however remains enigmatic for the late Svecokarelian orogeny. Zircon grains from a magnetite-ilmenite gabbro yielded an age of 1881 ± 8 Ma, coeval with the Kiirunavaara IOA deposit and suggested to represent an important generation of mafic magmatism related to the ore. Lithogeochemistry of early bimodal Svecokarelian intrusions in the district indicates a within-plate to active continental margin environment with a volcanic arc affinity, pointing to a back arc environment. Epsilon Ndi and 87Sr/86Sri values calculated from the U-Pb ages for the igneous intrusions were compared to samples of ore-related alteration from epigenetic Pahtohavare and Rakkurijärvi deposits, district greenstone, and Archean samples. Results show that each deposit sourced Sr and Nd from a variety of rocks suggesting broad fluid transport. Each deposit has a distinct Sr mixing trend suggesting they formed from different ore-forming fluids and pathways. This is supported by new structural data ... Master Thesis Kiruna Norrbotten Luleå University of Technology Publications (DiVA) Kiruna Rakkurijärvi ENVELOPE(20.167,20.167,67.767,67.767) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Kiruna tectonic framework mineral system IOCG IOA remobilization sulfur isotopes trace elements geochronology Pahtohavare Viscaria Rakkurijärvi Geology Geologi |
spellingShingle |
Kiruna tectonic framework mineral system IOCG IOA remobilization sulfur isotopes trace elements geochronology Pahtohavare Viscaria Rakkurijärvi Geology Geologi Logan, Leslie Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
topic_facet |
Kiruna tectonic framework mineral system IOCG IOA remobilization sulfur isotopes trace elements geochronology Pahtohavare Viscaria Rakkurijärvi Geology Geologi |
description |
The Kiruna mining district, located in the northern Norrbotten ore province, Sweden, is a geologically and economically important area, being the type-locality for Kiruna iron oxide-apatite (IOA) deposits and also host to a variety of other deposits including syngenetic stratiform exhalative Cu-(Fe-Zn) (Viscaria, Eastern Pahtohavare), epigenetic stratabound Cu ± Au (Pahtohavare), and iron oxide-copper-gold (IOCG, Rakkurijärvi) deposits. However, the timing of IOA versus IOCG within the tectonic evolution is in question based on structural investigations showing Cu- and Fe-sulfides occur in late-orogenic structures. Here we use an established tectonic framework to constrain mineral systems (tectonic/thermal drives, metal and ligand sources, fluid pathways, traps, remobilization mechanisms) related to the early and late phases of the Svecokarelian orogeny in the Kiruna mining district. U-Pb zircon geochronology of intrusions in the district indicates a thermal drive was present during the early phase of the Svecokarelian orogeny from ca. 1920-1865 Ma, however remains enigmatic for the late Svecokarelian orogeny. Zircon grains from a magnetite-ilmenite gabbro yielded an age of 1881 ± 8 Ma, coeval with the Kiirunavaara IOA deposit and suggested to represent an important generation of mafic magmatism related to the ore. Lithogeochemistry of early bimodal Svecokarelian intrusions in the district indicates a within-plate to active continental margin environment with a volcanic arc affinity, pointing to a back arc environment. Epsilon Ndi and 87Sr/86Sri values calculated from the U-Pb ages for the igneous intrusions were compared to samples of ore-related alteration from epigenetic Pahtohavare and Rakkurijärvi deposits, district greenstone, and Archean samples. Results show that each deposit sourced Sr and Nd from a variety of rocks suggesting broad fluid transport. Each deposit has a distinct Sr mixing trend suggesting they formed from different ore-forming fluids and pathways. This is supported by new structural data ... |
format |
Master Thesis |
author |
Logan, Leslie |
author_facet |
Logan, Leslie |
author_sort |
Logan, Leslie |
title |
Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
title_short |
Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
title_full |
Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
title_fullStr |
Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
title_full_unstemmed |
Utilizing a tectonic framework to constrain the mineral system and remobilization in the Kiruna mining district, Sweden |
title_sort |
utilizing a tectonic framework to constrain the mineral system and remobilization in the kiruna mining district, sweden |
publisher |
Luleå tekniska universitet, Geovetenskap och miljöteknik |
publishDate |
2022 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-88406 |
long_lat |
ENVELOPE(20.167,20.167,67.767,67.767) |
geographic |
Kiruna Rakkurijärvi |
geographic_facet |
Kiruna Rakkurijärvi |
genre |
Kiruna Norrbotten |
genre_facet |
Kiruna Norrbotten |
op_relation |
Licentiate thesis / Luleå University of Technology, 1402-1757 orcid:0000-0003-1583-502x http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-88406 urn:isbn:978-91-7790-995-8 urn:isbn:978-91-7790-996-5 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766058150654377984 |