Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden
Titanite occurs as a widespread accessory phase in mineralized zones and alteration associated with iron oxide-copper gold (IOCG) and iron oxide-apatite (IOA) deposits of Norrbotten County, Sweden, and is a major host of the REE in these deposits. In situ analyses of Sm-Nd isotope ratios in titanite...
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Elsevier
2016
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institution |
Open Polar |
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UBR (University of Brighton Repository) |
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ftunivbrighton |
language |
English |
topic |
F670 Geochemistry F610 Applied geology |
spellingShingle |
F670 Geochemistry F610 Applied geology Storey, Craig Smith, Martin Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
topic_facet |
F670 Geochemistry F610 Applied geology |
description |
Titanite occurs as a widespread accessory phase in mineralized zones and alteration associated with iron oxide-copper gold (IOCG) and iron oxide-apatite (IOA) deposits of Norrbotten County, Sweden, and is a major host of the REE in these deposits. In situ analyses of Sm-Nd isotope ratios in titanites previously analysed for U-Pb geochronology and trace element composition confirms previous interpretations of grain scale isotopic heterogeneity. Initial Nd-isotope ratios expressed relative to CHUR range from ~-3 to -8 in IOA deposits, from ~-1 to -9 in IOCG deposits, and from +2 to -4 in the most Cu-rich, deformed IOCG deposits of the Nautanen Deformation zone. Within individual IOA deposits at Valkommen (Malmberget), from -1.4 to -5.7 in grain cores, and -7.2 to -8.2 in grain rims rim at Gruvberget; and from -3.0 to -6.0 in grain cores and from -5.8 to -7.1 in grain rims at Luossavaara. In IOCG deposits at Rakkurijärvi IOCG dpeosits at Nautanen from -1.3 to -2.3. These values are consistent with the derivation of the REE, and potentially economically enriched metals, from the local volcanic sequence, either via granitic melts, or directly by leaching by metasomatic fluids. The most Cu-rich deposits reflect the involvement of more basic protoliths. The age distribution of these deposits suggest IOA deposit formation during the collisional phase of the Svecofennian orogeny (~1.9-1.8 Ga), and IOCG mineralization during this phase and during post-orogenic collapse (~1.8-1.7 Ga), whilst model ages indicate the ultimate enrichment of the continental crust in these metals during pre-collisional extensional and subduction-related basic magmatism. These processes underscore the importance of continental cycles both in producing the preserved geological record of orogenic ore deposition, and in the generation of fertile continental crust, from which metals can be mobilised by subsequent events.Nd varies relative to CHUR: from -3.1 to -4.0Nd varies from -6.1. to -7.1, and in deformed IOCG dpeosits at Nautanen from -1.3 to -2.3. These values are consistent with the derivation of the REE, and potentially economically enriched metals, from the local volcanic sequence, either via granitic melts, or directly by leaching by metasomatic fluids. The most Cu-rich deposits reflect the involvement of more basic protoliths. The age distribution of these deposits suggest IOA deposit formation during the collisional phase of the Svecofennian orogeny (~1.9-1.8 Ga), and IOCG mineralization during this phase and during post-orogenic collapse (~1.8-1.7 Ga), whilst model ages indicate the ultimate enrichment of the continental crust in these metals during pre-collisional extensional and subduction-related basic magmatism. These processes underscore the importance of continental cycles both in producing the preserved geological record of orogenic ore deposition, and in the generation of fertile continental crust, from which metals can be mobilised by subsequent events. |
format |
Article in Journal/Newspaper |
author |
Storey, Craig Smith, Martin |
author_facet |
Storey, Craig Smith, Martin |
author_sort |
Storey, Craig |
title |
Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
title_short |
Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
title_full |
Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
title_fullStr |
Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
title_full_unstemmed |
Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden |
title_sort |
metal source and tectonic setting of iron oxide-copper-gold (iocg) deposits: evidence from an in situ nd isotope study of titanite from norrbotten, sweden |
publisher |
Elsevier |
publishDate |
2016 |
url |
http://eprints.brighton.ac.uk/16432/ http://eprints.brighton.ac.uk/16432/1/1-s2.0-S0169136816301524-main.pdf |
long_lat |
ENVELOPE(21.767,21.767,65.785,65.785) ENVELOPE(20.233,20.233,67.867,67.867) ENVELOPE(20.883,20.883,67.183,67.183) ENVELOPE(20.167,20.167,67.767,67.767) |
geographic |
Gruvberget Luossavaara Nautanen Rakkurijärvi |
geographic_facet |
Gruvberget Luossavaara Nautanen Rakkurijärvi |
genre |
Malmberget Norrbotten |
genre_facet |
Malmberget Norrbotten |
op_relation |
http://eprints.brighton.ac.uk/16432/1/1-s2.0-S0169136816301524-main.pdf Storey, Craig and Smith, Martin (2016) Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden Ore Geology Reviews, 81 (4). pp. 1287-1302. ISSN 0169-1368 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
_version_ |
1766066600414281728 |
spelling |
ftunivbrighton:oai:eprints.brighton.ac.uk:16432 2023-05-15T17:10:09+02:00 Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden Storey, Craig Smith, Martin 2016-09-01 text http://eprints.brighton.ac.uk/16432/ http://eprints.brighton.ac.uk/16432/1/1-s2.0-S0169136816301524-main.pdf en eng Elsevier http://eprints.brighton.ac.uk/16432/1/1-s2.0-S0169136816301524-main.pdf Storey, Craig and Smith, Martin (2016) Metal source and tectonic setting of iron oxide-copper-gold (IOCG) deposits: Evidence from an in situ Nd isotope study of titanite from Norrbotten, Sweden Ore Geology Reviews, 81 (4). pp. 1287-1302. ISSN 0169-1368 cc_by CC-BY F670 Geochemistry F610 Applied geology Journal article PeerReviewed 2016 ftunivbrighton 2018-12-03T19:55:10Z Titanite occurs as a widespread accessory phase in mineralized zones and alteration associated with iron oxide-copper gold (IOCG) and iron oxide-apatite (IOA) deposits of Norrbotten County, Sweden, and is a major host of the REE in these deposits. In situ analyses of Sm-Nd isotope ratios in titanites previously analysed for U-Pb geochronology and trace element composition confirms previous interpretations of grain scale isotopic heterogeneity. Initial Nd-isotope ratios expressed relative to CHUR range from ~-3 to -8 in IOA deposits, from ~-1 to -9 in IOCG deposits, and from +2 to -4 in the most Cu-rich, deformed IOCG deposits of the Nautanen Deformation zone. Within individual IOA deposits at Valkommen (Malmberget), from -1.4 to -5.7 in grain cores, and -7.2 to -8.2 in grain rims rim at Gruvberget; and from -3.0 to -6.0 in grain cores and from -5.8 to -7.1 in grain rims at Luossavaara. In IOCG deposits at Rakkurijärvi IOCG dpeosits at Nautanen from -1.3 to -2.3. These values are consistent with the derivation of the REE, and potentially economically enriched metals, from the local volcanic sequence, either via granitic melts, or directly by leaching by metasomatic fluids. The most Cu-rich deposits reflect the involvement of more basic protoliths. The age distribution of these deposits suggest IOA deposit formation during the collisional phase of the Svecofennian orogeny (~1.9-1.8 Ga), and IOCG mineralization during this phase and during post-orogenic collapse (~1.8-1.7 Ga), whilst model ages indicate the ultimate enrichment of the continental crust in these metals during pre-collisional extensional and subduction-related basic magmatism. These processes underscore the importance of continental cycles both in producing the preserved geological record of orogenic ore deposition, and in the generation of fertile continental crust, from which metals can be mobilised by subsequent events.Nd varies relative to CHUR: from -3.1 to -4.0Nd varies from -6.1. to -7.1, and in deformed IOCG dpeosits at Nautanen from -1.3 to -2.3. These values are consistent with the derivation of the REE, and potentially economically enriched metals, from the local volcanic sequence, either via granitic melts, or directly by leaching by metasomatic fluids. The most Cu-rich deposits reflect the involvement of more basic protoliths. The age distribution of these deposits suggest IOA deposit formation during the collisional phase of the Svecofennian orogeny (~1.9-1.8 Ga), and IOCG mineralization during this phase and during post-orogenic collapse (~1.8-1.7 Ga), whilst model ages indicate the ultimate enrichment of the continental crust in these metals during pre-collisional extensional and subduction-related basic magmatism. These processes underscore the importance of continental cycles both in producing the preserved geological record of orogenic ore deposition, and in the generation of fertile continental crust, from which metals can be mobilised by subsequent events. Article in Journal/Newspaper Malmberget Norrbotten UBR (University of Brighton Repository) Gruvberget ENVELOPE(21.767,21.767,65.785,65.785) Luossavaara ENVELOPE(20.233,20.233,67.867,67.867) Nautanen ENVELOPE(20.883,20.883,67.183,67.183) Rakkurijärvi ENVELOPE(20.167,20.167,67.767,67.767) |