Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia
The Paleoproterozoic Monchegorsk Complex in northwest Russia represents one of the largest layered intrusions in Europe and hosts several examples of broadly stratiform platinum group element (PGE) mineralization at different stratigraphic levels of the intrusion that have been suggested to represen...
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Language: | English |
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2018
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Online Access: | https://constellation.uqac.ca/id/eprint/4913/1/1333-1358.pdf |
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ftunivquebecchic:oai:constellation.uqac.ca:4913 2023-05-15T17:46:07+02:00 Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia Karykowski, Bartosz T. Maier, Wolfgang D. Groshev, Nikolay Y. Barnes, Sarah-Jane Pripachkin, Pavel V. McDonald, Iain 2018-09 application/pdf https://constellation.uqac.ca/id/eprint/4913/1/1333-1358.pdf en eng https://constellation.uqac.ca/id/eprint/4913/ http://dx.doi.org/doi.org/10.5382/econgeo.2018.4594 https://constellation.uqac.ca/id/eprint/4913/1/1333-1358.pdf Karykowski Bartosz T., Maier Wolfgang D., Groshev Nikolay Y., Barnes Sarah-Jane, Pripachkin Pavel V. et McDonald Iain. (2018). Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia. Economic Geology, 113, (6), p. 1333-1358. Sciences de la terre (géologie géographie) Article publié dans une revue avec comité d'évaluation Évalué par les pairs 2018 ftunivquebecchic https://doi.org/10.5382/econgeo.2018.4594 2023-02-11T23:12:59Z The Paleoproterozoic Monchegorsk Complex in northwest Russia represents one of the largest layered intrusions in Europe and hosts several examples of broadly stratiform platinum group element (PGE) mineralization at different stratigraphic levels of the intrusion that have been suggested to represent reef-style mineralization. The Sopcha reef occurs in the ultramafic lower portion of the complex and constitutes an up to 6-m-thick succession of layered, mineralized dunite, harzburgite, and olivine-orthopyroxenite, with peak grades of 3.4 ppm Pt + Pd and 1.1 wt % Ni. Another PGE occurrence is hosted by the leucogabbronoritic to anorthositic Vuruchuaivench intrusion, which represents part of the mafic upper portion of the Monchegorsk Complex. The disseminated sulfide mineralization reaches up to 7.3 ppm Pt + Pd and is concentrated in several lenticular bodies over a strike length of ~5 km, rather than in a laterally continuous reef as previously suggested. Moreover, our work identified a previously unreported minor enrichment in precious metals of up to 0.2 ppm Pt + Pd in leucogabbroic rocks of the Monchetundra intrusion, which represents the uppermost portion of the Monchegorsk Complex and belongs to the more than 60-km-long mafic Main Ridge. Detailed lithophile and chalcophile element data, coupled with mineral chemistry, indicate that the PGE mineralization at Sopcha and Vuruchuaivench does not represent classic reef-style mineralization, which is commonly narrow and marked by a sharp increase in Cu/Pd ratios, reflecting the in situ sulfide saturation within a large magma chamber. Instead, it is more likely that the Sopcha reef was emplaced as a crustally contaminated and sulfide-saturated, olivine-rich crystal mush that was sourced from a deeper chamber. The Sopcha mineralization is characterized by Pd/Pt > 5 and Pd/Ir > 55, similar to contact-style mineralization elsewhere in the complex, possibly suggesting a common origin of the sulfides. The mineralized Vuruchuaivench rocks have similar Pd/Pt but much ... Other/Unknown Material Northwest Russia Université du Québec à Chicoutimi (UQAC): Constellation Monchegorsk ENVELOPE(32.874,32.874,67.940,67.940) Economic Geology 113 6 1333 1358 |
institution |
Open Polar |
collection |
Université du Québec à Chicoutimi (UQAC): Constellation |
op_collection_id |
ftunivquebecchic |
language |
English |
topic |
Sciences de la terre (géologie géographie) |
spellingShingle |
Sciences de la terre (géologie géographie) Karykowski, Bartosz T. Maier, Wolfgang D. Groshev, Nikolay Y. Barnes, Sarah-Jane Pripachkin, Pavel V. McDonald, Iain Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
topic_facet |
Sciences de la terre (géologie géographie) |
description |
The Paleoproterozoic Monchegorsk Complex in northwest Russia represents one of the largest layered intrusions in Europe and hosts several examples of broadly stratiform platinum group element (PGE) mineralization at different stratigraphic levels of the intrusion that have been suggested to represent reef-style mineralization. The Sopcha reef occurs in the ultramafic lower portion of the complex and constitutes an up to 6-m-thick succession of layered, mineralized dunite, harzburgite, and olivine-orthopyroxenite, with peak grades of 3.4 ppm Pt + Pd and 1.1 wt % Ni. Another PGE occurrence is hosted by the leucogabbronoritic to anorthositic Vuruchuaivench intrusion, which represents part of the mafic upper portion of the Monchegorsk Complex. The disseminated sulfide mineralization reaches up to 7.3 ppm Pt + Pd and is concentrated in several lenticular bodies over a strike length of ~5 km, rather than in a laterally continuous reef as previously suggested. Moreover, our work identified a previously unreported minor enrichment in precious metals of up to 0.2 ppm Pt + Pd in leucogabbroic rocks of the Monchetundra intrusion, which represents the uppermost portion of the Monchegorsk Complex and belongs to the more than 60-km-long mafic Main Ridge. Detailed lithophile and chalcophile element data, coupled with mineral chemistry, indicate that the PGE mineralization at Sopcha and Vuruchuaivench does not represent classic reef-style mineralization, which is commonly narrow and marked by a sharp increase in Cu/Pd ratios, reflecting the in situ sulfide saturation within a large magma chamber. Instead, it is more likely that the Sopcha reef was emplaced as a crustally contaminated and sulfide-saturated, olivine-rich crystal mush that was sourced from a deeper chamber. The Sopcha mineralization is characterized by Pd/Pt > 5 and Pd/Ir > 55, similar to contact-style mineralization elsewhere in the complex, possibly suggesting a common origin of the sulfides. The mineralized Vuruchuaivench rocks have similar Pd/Pt but much ... |
format |
Other/Unknown Material |
author |
Karykowski, Bartosz T. Maier, Wolfgang D. Groshev, Nikolay Y. Barnes, Sarah-Jane Pripachkin, Pavel V. McDonald, Iain |
author_facet |
Karykowski, Bartosz T. Maier, Wolfgang D. Groshev, Nikolay Y. Barnes, Sarah-Jane Pripachkin, Pavel V. McDonald, Iain |
author_sort |
Karykowski, Bartosz T. |
title |
Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
title_short |
Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
title_full |
Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
title_fullStr |
Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
title_full_unstemmed |
Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia |
title_sort |
origin of reef-style pge mineralization in the paleoproterozoic monchegorsk complex, kola region, russia |
publishDate |
2018 |
url |
https://constellation.uqac.ca/id/eprint/4913/1/1333-1358.pdf |
long_lat |
ENVELOPE(32.874,32.874,67.940,67.940) |
geographic |
Monchegorsk |
geographic_facet |
Monchegorsk |
genre |
Northwest Russia |
genre_facet |
Northwest Russia |
op_relation |
https://constellation.uqac.ca/id/eprint/4913/ http://dx.doi.org/doi.org/10.5382/econgeo.2018.4594 https://constellation.uqac.ca/id/eprint/4913/1/1333-1358.pdf Karykowski Bartosz T., Maier Wolfgang D., Groshev Nikolay Y., Barnes Sarah-Jane, Pripachkin Pavel V. et McDonald Iain. (2018). Origin of reef-style PGE mineralization in the Paleoproterozoic Monchegorsk Complex, Kola Region, Russia. Economic Geology, 113, (6), p. 1333-1358. |
op_doi |
https://doi.org/10.5382/econgeo.2018.4594 |
container_title |
Economic Geology |
container_volume |
113 |
container_issue |
6 |
container_start_page |
1333 |
op_container_end_page |
1358 |
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1766149474104639488 |