Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden
The Gällivare area is situated in northern Norrbotten, Sweden, and hosts the Aitik Cu-Au deposit and the Malmberget Fe deposit. In addition, more than 17 mineral prospects and mineralizations are present, among these the currently developed Nautanen Cu-Au deposit. All deposits are hosted within Pale...
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Luleå tekniska universitet, Geovetenskap och miljöteknik
2016
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ftluleatu:oai:DiVA.org:ltu-25689 2023-12-17T10:30:26+01:00 Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden Sarlus, Zimer 2016 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25689 eng eng Luleå tekniska universitet, Geovetenskap och miljöteknik Luleå Licentiate thesis / Luleå University of Technology, 1402-1757 orcid:0000-0002-7413-4461 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25689 urn:isbn:978-91-7583-640-9 urn:isbn:978-91-7583-641-6 Local aa11ebe0-9766-46ff-9032-464c9dbfe646 info:eu-repo/semantics/openAccess Geology Geologi Licentiate thesis, comprehensive summary info:eu-repo/semantics/masterThesis text 2016 ftluleatu 2023-11-23T17:10:44Z The Gällivare area is situated in northern Norrbotten, Sweden, and hosts the Aitik Cu-Au deposit and the Malmberget Fe deposit. In addition, more than 17 mineral prospects and mineralizations are present, among these the currently developed Nautanen Cu-Au deposit. All deposits are hosted within Paleoproterozoic volcanic and volcano-sedimentary successions intruded and surrounded by multiple generations of intrusive suites, including large bodies of ultramafic to mafic layered complexes. Detailed field mapping combined with geochemical and petrological investigations and geochronology have revealed suites of igneous rocks ranging in composition from ultramafic-mafic, intermediate to felsic. Main key igneous rocks include 1) tholeiitic, ultramafic-mafic layered intrusive complexes; 2) calc-alkaline mafic to intermediate plutonic and volcanic units; 3) calc-alkaline, mafic-intermediate dykes and sills; 4) calc-alkaline and shoshonitic granitoids. U-Pb multigrain zircon SIMS analysis combined with lithogeochemical investigations suggest two magmatic episodes at 1.88 and 1.80 Ga, respectively, with coeval mafic-felsic magmatism including the generation of voluminous layered complexes. Based on their MORB-type, tholeiitic character, these layered complexes are suggested to have formed in an extensional setting, preferentially in a back-arc environment. U-Pb multigrain zircon SIMS analysis and field mapping also reveal that granitoids in the area range from 1886 to 1779 Ma with the oldest granitoids containing mafic enclaves. This suggests magma interaction between basic and felsic magma sources. Geochemical data suggest generation of granitoids in a volcanic arc environment in a mainly post-collisional setting. Results suggest the formation of layered complexes and a volcanic arc system in an extensional setting followed by a subsequent compressional phase of arc accretion producing post-collisional granitoids. The 1.88 Ga event that generated the ultramafic-mafic layered complexes is associated with a back-arc ... Master Thesis Gällivare Malmberget Northern Sweden Norrbotten Luleå University of Technology Publications (DiVA) Gällivare ENVELOPE(20.660,20.660,67.132,67.132) Nautanen ENVELOPE(20.883,20.883,67.183,67.183) |
institution |
Open Polar |
collection |
Luleå University of Technology Publications (DiVA) |
op_collection_id |
ftluleatu |
language |
English |
topic |
Geology Geologi |
spellingShingle |
Geology Geologi Sarlus, Zimer Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
topic_facet |
Geology Geologi |
description |
The Gällivare area is situated in northern Norrbotten, Sweden, and hosts the Aitik Cu-Au deposit and the Malmberget Fe deposit. In addition, more than 17 mineral prospects and mineralizations are present, among these the currently developed Nautanen Cu-Au deposit. All deposits are hosted within Paleoproterozoic volcanic and volcano-sedimentary successions intruded and surrounded by multiple generations of intrusive suites, including large bodies of ultramafic to mafic layered complexes. Detailed field mapping combined with geochemical and petrological investigations and geochronology have revealed suites of igneous rocks ranging in composition from ultramafic-mafic, intermediate to felsic. Main key igneous rocks include 1) tholeiitic, ultramafic-mafic layered intrusive complexes; 2) calc-alkaline mafic to intermediate plutonic and volcanic units; 3) calc-alkaline, mafic-intermediate dykes and sills; 4) calc-alkaline and shoshonitic granitoids. U-Pb multigrain zircon SIMS analysis combined with lithogeochemical investigations suggest two magmatic episodes at 1.88 and 1.80 Ga, respectively, with coeval mafic-felsic magmatism including the generation of voluminous layered complexes. Based on their MORB-type, tholeiitic character, these layered complexes are suggested to have formed in an extensional setting, preferentially in a back-arc environment. U-Pb multigrain zircon SIMS analysis and field mapping also reveal that granitoids in the area range from 1886 to 1779 Ma with the oldest granitoids containing mafic enclaves. This suggests magma interaction between basic and felsic magma sources. Geochemical data suggest generation of granitoids in a volcanic arc environment in a mainly post-collisional setting. Results suggest the formation of layered complexes and a volcanic arc system in an extensional setting followed by a subsequent compressional phase of arc accretion producing post-collisional granitoids. The 1.88 Ga event that generated the ultramafic-mafic layered complexes is associated with a back-arc ... |
format |
Master Thesis |
author |
Sarlus, Zimer |
author_facet |
Sarlus, Zimer |
author_sort |
Sarlus, Zimer |
title |
Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
title_short |
Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
title_full |
Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
title_fullStr |
Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
title_full_unstemmed |
Geochemical and geochronological constraints on 1.88 and 1.80 Ga magmatic events in the Gällivare area, northern Sweden |
title_sort |
geochemical and geochronological constraints on 1.88 and 1.80 ga magmatic events in the gällivare area, northern sweden |
publisher |
Luleå tekniska universitet, Geovetenskap och miljöteknik |
publishDate |
2016 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25689 |
long_lat |
ENVELOPE(20.660,20.660,67.132,67.132) ENVELOPE(20.883,20.883,67.183,67.183) |
geographic |
Gällivare Nautanen |
geographic_facet |
Gällivare Nautanen |
genre |
Gällivare Malmberget Northern Sweden Norrbotten |
genre_facet |
Gällivare Malmberget Northern Sweden Norrbotten |
op_relation |
Licentiate thesis / Luleå University of Technology, 1402-1757 orcid:0000-0002-7413-4461 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25689 urn:isbn:978-91-7583-640-9 urn:isbn:978-91-7583-641-6 Local aa11ebe0-9766-46ff-9032-464c9dbfe646 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1785583408149168128 |