In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland
The ~ 2.06-Ga Kevitsa mafic-ultramafic intrusion in northern Finland hosts a large disseminated Ni-Cu-PGE deposit. The deposit occurs in the ultramafic olivine-pyroxene cumulates and shows a range in Ni tenors varying from 4–7 wt% (regular ore) to > 10 wt% (Ni-PGE ore). There are also a metal-poo...
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Springer Verlag
2018
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:110464 2023-05-15T17:42:25+02:00 In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland Luolavirta, Kirsi Hanski, Eero Maier, Wolfgang Lahaye, Yann O'Brien, Hugh Santaguida, Frank 2018-10-01 application/pdf https://orca.cardiff.ac.uk/id/eprint/110464/ https://doi.org/10.1007/s00126-018-0792-6 https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf en eng Springer Verlag https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf Luolavirta, Kirsi, Hanski, Eero, Maier, Wolfgang https://orca.cardiff.ac.uk/view/cardiffauthors/A1523083O.html orcid:0000-0002-8654-6658 orcid:0000-0002-8654-6658, Lahaye, Yann, O'Brien, Hugh and Santaguida, Frank 2018. In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland. Mineralium Deposita 53 (7) , pp. 1019-1038. 10.1007/s00126-018-0792-6 https://doi.org/10.1007/s00126-018-0792-6 file https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf doi:10.1007/s00126-018-0792-6 Article PeerReviewed 2018 ftunivcardiff https://doi.org/10.1007/s00126-018-0792-6 2022-10-27T22:43:46Z The ~ 2.06-Ga Kevitsa mafic-ultramafic intrusion in northern Finland hosts a large disseminated Ni-Cu-PGE deposit. The deposit occurs in the ultramafic olivine-pyroxene cumulates and shows a range in Ni tenors varying from 4–7 wt% (regular ore) to > 10 wt% (Ni-PGE ore). There are also a metal-poor sulfide mineralization (false ore) and contact mineralization that are uneconomic (Ni tenor < 4 wt%). The obtained 87Sr/86Sr(i) values of the Kevitsa ultramafic cumulates are highly radiogenic (> 0.7045) in comparison to the estimated depleted mantle Sr isotope ratio of ~ 0.702 at 2.06 Ga. The sulfur δ34S values are generally higher than + 2‰, which together with the Sr isotope data imply involvement of crustal material in the genesis of the Kevitsa intrusion and its ores. The 87Sr/86Sr(i) values obtained from the ore-bearing domain of the intrusion show stratigraphic variation and exceed 0.7050, with the maximum value reaching up to 0.7109. In contrast, in rocks around the ore domain, the initial Sr isotope compositions remain more or less constant (0.7047–0.7060) throughout the intrusive stratigraphy. The isotope data suggest that the ore-bearing domain of the intrusion represents a dynamic site with multiple injections of variably contaminated magma, whereas the surrounding part of the intrusion experienced a less vigorous emplacement history. No correlation is observed between the strontium and sulfur isotope compositions. This is explained by bulk assimilation of the silicate magma in a deeper staging magma chamber and variable assimilation of sulfur during magma transport into the Kevitsa magma chamber. The low level of metals in false ore and the Ni-depleted nature of its olivine suggest that some sulfides may have precipitated and deposited in the feeder conduit during the initial stage of magma emplacement. Cannibalization of early-formed sulfides by later magma injections may have been important in the formation of the economic ore deposit. Article in Journal/Newspaper Northern Finland Cardiff University: ORCA (Online Research @ Cardiff) Mineralium Deposita 53 7 1019 1038 |
institution |
Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
description |
The ~ 2.06-Ga Kevitsa mafic-ultramafic intrusion in northern Finland hosts a large disseminated Ni-Cu-PGE deposit. The deposit occurs in the ultramafic olivine-pyroxene cumulates and shows a range in Ni tenors varying from 4–7 wt% (regular ore) to > 10 wt% (Ni-PGE ore). There are also a metal-poor sulfide mineralization (false ore) and contact mineralization that are uneconomic (Ni tenor < 4 wt%). The obtained 87Sr/86Sr(i) values of the Kevitsa ultramafic cumulates are highly radiogenic (> 0.7045) in comparison to the estimated depleted mantle Sr isotope ratio of ~ 0.702 at 2.06 Ga. The sulfur δ34S values are generally higher than + 2‰, which together with the Sr isotope data imply involvement of crustal material in the genesis of the Kevitsa intrusion and its ores. The 87Sr/86Sr(i) values obtained from the ore-bearing domain of the intrusion show stratigraphic variation and exceed 0.7050, with the maximum value reaching up to 0.7109. In contrast, in rocks around the ore domain, the initial Sr isotope compositions remain more or less constant (0.7047–0.7060) throughout the intrusive stratigraphy. The isotope data suggest that the ore-bearing domain of the intrusion represents a dynamic site with multiple injections of variably contaminated magma, whereas the surrounding part of the intrusion experienced a less vigorous emplacement history. No correlation is observed between the strontium and sulfur isotope compositions. This is explained by bulk assimilation of the silicate magma in a deeper staging magma chamber and variable assimilation of sulfur during magma transport into the Kevitsa magma chamber. The low level of metals in false ore and the Ni-depleted nature of its olivine suggest that some sulfides may have precipitated and deposited in the feeder conduit during the initial stage of magma emplacement. Cannibalization of early-formed sulfides by later magma injections may have been important in the formation of the economic ore deposit. |
format |
Article in Journal/Newspaper |
author |
Luolavirta, Kirsi Hanski, Eero Maier, Wolfgang Lahaye, Yann O'Brien, Hugh Santaguida, Frank |
spellingShingle |
Luolavirta, Kirsi Hanski, Eero Maier, Wolfgang Lahaye, Yann O'Brien, Hugh Santaguida, Frank In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
author_facet |
Luolavirta, Kirsi Hanski, Eero Maier, Wolfgang Lahaye, Yann O'Brien, Hugh Santaguida, Frank |
author_sort |
Luolavirta, Kirsi |
title |
In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
title_short |
In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
title_full |
In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
title_fullStr |
In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
title_full_unstemmed |
In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland |
title_sort |
in situ strontium and sulfur isotope investigation of the ni-cu-(pge) sulfide ore-bearing kevitsa intrusion, northern finland |
publisher |
Springer Verlag |
publishDate |
2018 |
url |
https://orca.cardiff.ac.uk/id/eprint/110464/ https://doi.org/10.1007/s00126-018-0792-6 https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf Luolavirta, Kirsi, Hanski, Eero, Maier, Wolfgang https://orca.cardiff.ac.uk/view/cardiffauthors/A1523083O.html orcid:0000-0002-8654-6658 orcid:0000-0002-8654-6658, Lahaye, Yann, O'Brien, Hugh and Santaguida, Frank 2018. In situ strontium and sulfur isotope investigation of the Ni-Cu-(PGE) sulfide ore-bearing Kevitsa intrusion, northern Finland. Mineralium Deposita 53 (7) , pp. 1019-1038. 10.1007/s00126-018-0792-6 https://doi.org/10.1007/s00126-018-0792-6 file https://orca.cardiff.ac.uk/id/eprint/110464/1/In%20situ%20strontium%20and%20sulfur%20isotope%20investigation%20of%20the%20Ni-Cu.pdf doi:10.1007/s00126-018-0792-6 |
op_doi |
https://doi.org/10.1007/s00126-018-0792-6 |
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Mineralium Deposita |
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53 |
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1019 |
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1038 |
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1766144276321796096 |