Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data
This paper continues the Sm-Nd isotope geochronological research carried out at the two largest Paleoproterozoic ore complexes of the northeastern Baltic Shield, i.e., the Cu-Ni-Cr Monchegorsk and the Pt-Pd Fedorovo-Pansky intrusions. These economically significant deposits are examples of layered c...
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MDPI AG
2021
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ftdoajarticles:oai:doaj.org/article:14162e1dbec7465086870c027090945b 2023-05-15T15:15:39+02:00 Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data Pavel A. Serov 2021-12-01T00:00:00Z https://doi.org/10.3390/min11121410 https://doaj.org/article/14162e1dbec7465086870c027090945b EN eng MDPI AG https://www.mdpi.com/2075-163X/11/12/1410 https://doaj.org/toc/2075-163X doi:10.3390/min11121410 2075-163X https://doaj.org/article/14162e1dbec7465086870c027090945b Minerals, Vol 11, Iss 1410, p 1410 (2021) Fennoscandian Shield Arctic region Cu-Ni-PGE ores mafic-ultramafic complexes metallogeny layered intrusions Mineralogy QE351-399.2 article 2021 ftdoajarticles https://doi.org/10.3390/min11121410 2022-12-31T15:17:10Z This paper continues the Sm-Nd isotope geochronological research carried out at the two largest Paleoproterozoic ore complexes of the northeastern Baltic Shield, i.e., the Cu-Ni-Cr Monchegorsk and the Pt-Pd Fedorovo-Pansky intrusions. These economically significant deposits are examples of layered complexes in the northeastern part of the Fennoscandian Shield. Understanding the stages of their formation and transformation helps in the reconstruction of the long-term evolution of ore-forming systems. This knowledge is necessary for subsequent critical metallogenic and geodynamic conclusions. We applied the Sm-Nd method of comprehensive age determination to define the main age ranges of intrusion. Syngenetic ore genesis occurred 2.53–2.85 Ga; hydrothermal metasomatic ore formation took place 2.70 Ga; and the injection of additional magma batches occurred 2.44–2.50 Ga. The rock transformation and redeposited ore formation at 2.0–1.9 Ga corresponded to the beginning of the Svecofennian events, widely presented on the Fennoscandian Shield. According to geochronological and Nd-Sr isotope data, rocks of the Monchegorsk and the Fedorovo-Pansky complexes seemed to have an anomalous mantle source in common with Paleoproterozoic layered intrusions of the Fennoscandian Shield (enriched with lithophile elements, εNd values vary from −3.0 to +2.5 and ISr 0.702–0.705). The data obtained comply with the known isotope-geochemical and geochronological characteristics of ore-bearing layered intrusions in the northeastern Baltic Shield. An interaction model of parental melts of the Fennoscandian layered intrusions and crustal matter shows a small level of contamination within the usual range of 5–10%. However, the margins of the Monchetundra massif indicate a much higher level of crustal contamination caused by active interaction of parental magmas and host rock. Article in Journal/Newspaper Arctic Fennoscandian Directory of Open Access Journals: DOAJ Articles Arctic Monchegorsk ENVELOPE(32.874,32.874,67.940,67.940) Minerals 11 12 1410 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Fennoscandian Shield Arctic region Cu-Ni-PGE ores mafic-ultramafic complexes metallogeny layered intrusions Mineralogy QE351-399.2 |
spellingShingle |
Fennoscandian Shield Arctic region Cu-Ni-PGE ores mafic-ultramafic complexes metallogeny layered intrusions Mineralogy QE351-399.2 Pavel A. Serov Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
topic_facet |
Fennoscandian Shield Arctic region Cu-Ni-PGE ores mafic-ultramafic complexes metallogeny layered intrusions Mineralogy QE351-399.2 |
description |
This paper continues the Sm-Nd isotope geochronological research carried out at the two largest Paleoproterozoic ore complexes of the northeastern Baltic Shield, i.e., the Cu-Ni-Cr Monchegorsk and the Pt-Pd Fedorovo-Pansky intrusions. These economically significant deposits are examples of layered complexes in the northeastern part of the Fennoscandian Shield. Understanding the stages of their formation and transformation helps in the reconstruction of the long-term evolution of ore-forming systems. This knowledge is necessary for subsequent critical metallogenic and geodynamic conclusions. We applied the Sm-Nd method of comprehensive age determination to define the main age ranges of intrusion. Syngenetic ore genesis occurred 2.53–2.85 Ga; hydrothermal metasomatic ore formation took place 2.70 Ga; and the injection of additional magma batches occurred 2.44–2.50 Ga. The rock transformation and redeposited ore formation at 2.0–1.9 Ga corresponded to the beginning of the Svecofennian events, widely presented on the Fennoscandian Shield. According to geochronological and Nd-Sr isotope data, rocks of the Monchegorsk and the Fedorovo-Pansky complexes seemed to have an anomalous mantle source in common with Paleoproterozoic layered intrusions of the Fennoscandian Shield (enriched with lithophile elements, εNd values vary from −3.0 to +2.5 and ISr 0.702–0.705). The data obtained comply with the known isotope-geochemical and geochronological characteristics of ore-bearing layered intrusions in the northeastern Baltic Shield. An interaction model of parental melts of the Fennoscandian layered intrusions and crustal matter shows a small level of contamination within the usual range of 5–10%. However, the margins of the Monchetundra massif indicate a much higher level of crustal contamination caused by active interaction of parental magmas and host rock. |
format |
Article in Journal/Newspaper |
author |
Pavel A. Serov |
author_facet |
Pavel A. Serov |
author_sort |
Pavel A. Serov |
title |
Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
title_short |
Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
title_full |
Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
title_fullStr |
Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
title_full_unstemmed |
Paleoproterozoic Pt-Pd Fedorovo-Pansky and Cu-Ni-Cr Monchegorsk Ore Complexes: Age, Metamorphism, and Crustal Contamination According to Sm-Nd Data |
title_sort |
paleoproterozoic pt-pd fedorovo-pansky and cu-ni-cr monchegorsk ore complexes: age, metamorphism, and crustal contamination according to sm-nd data |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/min11121410 https://doaj.org/article/14162e1dbec7465086870c027090945b |
long_lat |
ENVELOPE(32.874,32.874,67.940,67.940) |
geographic |
Arctic Monchegorsk |
geographic_facet |
Arctic Monchegorsk |
genre |
Arctic Fennoscandian |
genre_facet |
Arctic Fennoscandian |
op_source |
Minerals, Vol 11, Iss 1410, p 1410 (2021) |
op_relation |
https://www.mdpi.com/2075-163X/11/12/1410 https://doaj.org/toc/2075-163X doi:10.3390/min11121410 2075-163X https://doaj.org/article/14162e1dbec7465086870c027090945b |
op_doi |
https://doi.org/10.3390/min11121410 |
container_title |
Minerals |
container_volume |
11 |
container_issue |
12 |
container_start_page |
1410 |
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1766346012053471232 |