Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes
The article presents new Sm−Nd and U−Pb geochronological data on rocks of the poorly studied Pados-Tundra Cr-bearing complex. It is part of the Notozero mafic−ultramafic complex (western Kola Peninsula) and occurs at the border of the Paleoproterozoic Lapland Granulite Belt and the Archean Belomoria...
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MDPI AG
2020
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Online Access: | https://doi.org/10.3390/min10020186 https://doaj.org/article/b714b336be5b4bf0948480f04dc23c1c |
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ftdoajarticles:oai:doaj.org/article:b714b336be5b4bf0948480f04dc23c1c 2023-05-15T15:18:58+02:00 Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes Pavel A. Serov Tamara B. Bayanova Ekaterina N. Steshenko Evgeniy L. Kunakkuzin Elena S. Borisenko 2020-02-01T00:00:00Z https://doi.org/10.3390/min10020186 https://doaj.org/article/b714b336be5b4bf0948480f04dc23c1c EN eng MDPI AG https://www.mdpi.com/2075-163X/10/2/186 https://doaj.org/toc/2075-163X 2075-163X doi:10.3390/min10020186 https://doaj.org/article/b714b336be5b4bf0948480f04dc23c1c Minerals, Vol 10, Iss 2, p 186 (2020) fennoscandian shield arctic region sm–nd u–pb mafic–ultramafic complexes metallogeny layered intrusions ore magmatic system geochronology isotope methods Mineralogy QE351-399.2 article 2020 ftdoajarticles https://doi.org/10.3390/min10020186 2022-12-31T11:22:01Z The article presents new Sm−Nd and U−Pb geochronological data on rocks of the poorly studied Pados-Tundra Cr-bearing complex. It is part of the Notozero mafic−ultramafic complex (western Kola Peninsula) and occurs at the border of the Paleoproterozoic Lapland Granulite Belt and the Archean Belomorian composite terrain. The Pados-Tundra complex hosts two major zones, the Dunite and Orthopyroxenite Blocks. Dunites are associated with four levels of chromite mineralization. Isotope Sm−Nd studies of dunites, harzburgites, and orthopyroxenites from the central part of the complex have been carried out. The isochron Sm−Nd age on 11 whole-rock samples from a rhythmically layered series of the complex is 2485 ± 38 Ma; the mineral Sm−Nd isochron for harzburgites shows the age of 2475 ± 38 Ma. It corresponds with the time of large-scale rifting that originated in the Fennoscandian Shield. When the rhythmically layered series of the intrusion and its chromite mineralization were formed, hornblendite dykes intruded. The U−Pb and Sm−Nd research has estimated their age at ca. 2080 Ma, which is likely to correspond with the occurrence of the Lapland−Kola Ocean. According to isotope Sm−Nd dating on metamorphic minerals (rutile, amphibole), the age of postmetamorphic cooling of rocks in the complex to 650−600 °C is 1872 ± 76 Ma. The U−Pb age on rutile from a hornblendite dyke (1804 ± 10 Ma) indicates further cooling to 450−400 °C. The conducted research has determined the early Proterozoic age of rocks in the rhythmically layered series in the Pados-Tundra complex. It is close to the age of the Paleoproterozoic ore magmatic system in the Fennoscandian Shield that developed 2.53−2.40 Ga ago. Later episodes of alterations in rocks are directly related to main metamorphic episodes in the region at the turn of 1.9 Ga. Results of the current study expand the geography of the vast Paleoproterozoic East Scandinavian Large Igneous Province and can be applied for further studies of similar mafic−ultramafic complexes. Article in Journal/Newspaper Arctic Fennoscandian kola peninsula Tundra Lapland Directory of Open Access Journals: DOAJ Articles Arctic Kola Peninsula Pados ENVELOPE(29.800,29.800,68.101,68.101) Minerals 10 2 186 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
fennoscandian shield arctic region sm–nd u–pb mafic–ultramafic complexes metallogeny layered intrusions ore magmatic system geochronology isotope methods Mineralogy QE351-399.2 |
spellingShingle |
fennoscandian shield arctic region sm–nd u–pb mafic–ultramafic complexes metallogeny layered intrusions ore magmatic system geochronology isotope methods Mineralogy QE351-399.2 Pavel A. Serov Tamara B. Bayanova Ekaterina N. Steshenko Evgeniy L. Kunakkuzin Elena S. Borisenko Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
topic_facet |
fennoscandian shield arctic region sm–nd u–pb mafic–ultramafic complexes metallogeny layered intrusions ore magmatic system geochronology isotope methods Mineralogy QE351-399.2 |
description |
The article presents new Sm−Nd and U−Pb geochronological data on rocks of the poorly studied Pados-Tundra Cr-bearing complex. It is part of the Notozero mafic−ultramafic complex (western Kola Peninsula) and occurs at the border of the Paleoproterozoic Lapland Granulite Belt and the Archean Belomorian composite terrain. The Pados-Tundra complex hosts two major zones, the Dunite and Orthopyroxenite Blocks. Dunites are associated with four levels of chromite mineralization. Isotope Sm−Nd studies of dunites, harzburgites, and orthopyroxenites from the central part of the complex have been carried out. The isochron Sm−Nd age on 11 whole-rock samples from a rhythmically layered series of the complex is 2485 ± 38 Ma; the mineral Sm−Nd isochron for harzburgites shows the age of 2475 ± 38 Ma. It corresponds with the time of large-scale rifting that originated in the Fennoscandian Shield. When the rhythmically layered series of the intrusion and its chromite mineralization were formed, hornblendite dykes intruded. The U−Pb and Sm−Nd research has estimated their age at ca. 2080 Ma, which is likely to correspond with the occurrence of the Lapland−Kola Ocean. According to isotope Sm−Nd dating on metamorphic minerals (rutile, amphibole), the age of postmetamorphic cooling of rocks in the complex to 650−600 °C is 1872 ± 76 Ma. The U−Pb age on rutile from a hornblendite dyke (1804 ± 10 Ma) indicates further cooling to 450−400 °C. The conducted research has determined the early Proterozoic age of rocks in the rhythmically layered series in the Pados-Tundra complex. It is close to the age of the Paleoproterozoic ore magmatic system in the Fennoscandian Shield that developed 2.53−2.40 Ga ago. Later episodes of alterations in rocks are directly related to main metamorphic episodes in the region at the turn of 1.9 Ga. Results of the current study expand the geography of the vast Paleoproterozoic East Scandinavian Large Igneous Province and can be applied for further studies of similar mafic−ultramafic complexes. |
format |
Article in Journal/Newspaper |
author |
Pavel A. Serov Tamara B. Bayanova Ekaterina N. Steshenko Evgeniy L. Kunakkuzin Elena S. Borisenko |
author_facet |
Pavel A. Serov Tamara B. Bayanova Ekaterina N. Steshenko Evgeniy L. Kunakkuzin Elena S. Borisenko |
author_sort |
Pavel A. Serov |
title |
Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
title_short |
Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
title_full |
Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
title_fullStr |
Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
title_full_unstemmed |
Metallogenic Setting and Evolution of the Pados-Tundra Cr-Bearing Ultramafic Complex, Kola Peninsula: Evidence from Sm–Nd and U–Pb Isotopes |
title_sort |
metallogenic setting and evolution of the pados-tundra cr-bearing ultramafic complex, kola peninsula: evidence from sm–nd and u–pb isotopes |
publisher |
MDPI AG |
publishDate |
2020 |
url |
https://doi.org/10.3390/min10020186 https://doaj.org/article/b714b336be5b4bf0948480f04dc23c1c |
long_lat |
ENVELOPE(29.800,29.800,68.101,68.101) |
geographic |
Arctic Kola Peninsula Pados |
geographic_facet |
Arctic Kola Peninsula Pados |
genre |
Arctic Fennoscandian kola peninsula Tundra Lapland |
genre_facet |
Arctic Fennoscandian kola peninsula Tundra Lapland |
op_source |
Minerals, Vol 10, Iss 2, p 186 (2020) |
op_relation |
https://www.mdpi.com/2075-163X/10/2/186 https://doaj.org/toc/2075-163X 2075-163X doi:10.3390/min10020186 https://doaj.org/article/b714b336be5b4bf0948480f04dc23c1c |
op_doi |
https://doi.org/10.3390/min10020186 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
2 |
container_start_page |
186 |
_version_ |
1766349143585849344 |