Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield
The NE Fennoscandian Shield comprises the Northern Belt in Finland and the Southern Belt in Karelia. They host mafic-ultramafic layered Cu-Ni-Cr and Pt-Pd-bearing intrusions. Precise U-Pb and Sm-Nd analyses indicate the 130-Ma evolution of these intrusions, with major events at 2.53, 2.50, 2.45, and...
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ftmdpi:oai:mdpi.com:/2075-163X/9/1/59/ 2023-08-20T04:06:27+02:00 Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield Tamara Bayanova Aleksey Korchagin Alexander Mitrofanov Pavel Serov Nadezhda Ekimova Elena Nitkina Igor Kamensky Dmitry Elizarov Milosh Huber agris 2019-01-18 application/pdf https://doi.org/10.3390/min9010059 EN eng Multidisciplinary Digital Publishing Institute Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min9010059 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 9; Issue 1; Pages: 59 Plume LIP PGE Palaeoproterozoic mafic intrusion U-Pb isotopes Text 2019 ftmdpi https://doi.org/10.3390/min9010059 2023-07-31T21:58:56Z The NE Fennoscandian Shield comprises the Northern Belt in Finland and the Southern Belt in Karelia. They host mafic-ultramafic layered Cu-Ni-Cr and Pt-Pd-bearing intrusions. Precise U-Pb and Sm-Nd analyses indicate the 130-Ma evolution of these intrusions, with major events at 2.53, 2.50, 2.45, and 2.40 Ga. Barren phases were dated at 2.53 Ga for orthopyroxenites and olivine gabbro in the Fedorovo-Pansky massif. PGE-bearing phases of gabbronorites (Pechenga, Fedorovo-Pansky, Monchetundra massifs) and norites (Monchepluton) are 2.50 Ga old. Anorthosites of Mt. Generalskaya (Pechenga), the Fedorovo-Pansky, and Monchetundra massifs occurred at 2.45 Ga. This event produced layered PGE-bearing intrusions in Finland (Penikat, Kemi, Koitelainen) and mafic intrusions in Karelia. The Imandra lopolith dikes occurred at the final phase (2.40 Ga). Slightly negative εNd and ISr values (0.703–0.704) suggest that intrusions originated from an enriched mantle reservoir. Low 3He/4He ratios in accessory minerals (ilmenite and magnetite) indicate an upper mantle source. Large-scale correlations link the Fennoscandian Shield with the Superior and Wyoming cratons. Text Fennoscandian karelia* MDPI Open Access Publishing Pechenga ENVELOPE(30.989,30.989,69.401,69.401) Imandra ENVELOPE(33.260,33.260,67.849,67.849) Koitelainen ENVELOPE(27.161,27.161,67.795,67.795) Minerals 9 1 59 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Plume LIP PGE Palaeoproterozoic mafic intrusion U-Pb isotopes |
spellingShingle |
Plume LIP PGE Palaeoproterozoic mafic intrusion U-Pb isotopes Tamara Bayanova Aleksey Korchagin Alexander Mitrofanov Pavel Serov Nadezhda Ekimova Elena Nitkina Igor Kamensky Dmitry Elizarov Milosh Huber Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
topic_facet |
Plume LIP PGE Palaeoproterozoic mafic intrusion U-Pb isotopes |
description |
The NE Fennoscandian Shield comprises the Northern Belt in Finland and the Southern Belt in Karelia. They host mafic-ultramafic layered Cu-Ni-Cr and Pt-Pd-bearing intrusions. Precise U-Pb and Sm-Nd analyses indicate the 130-Ma evolution of these intrusions, with major events at 2.53, 2.50, 2.45, and 2.40 Ga. Barren phases were dated at 2.53 Ga for orthopyroxenites and olivine gabbro in the Fedorovo-Pansky massif. PGE-bearing phases of gabbronorites (Pechenga, Fedorovo-Pansky, Monchetundra massifs) and norites (Monchepluton) are 2.50 Ga old. Anorthosites of Mt. Generalskaya (Pechenga), the Fedorovo-Pansky, and Monchetundra massifs occurred at 2.45 Ga. This event produced layered PGE-bearing intrusions in Finland (Penikat, Kemi, Koitelainen) and mafic intrusions in Karelia. The Imandra lopolith dikes occurred at the final phase (2.40 Ga). Slightly negative εNd and ISr values (0.703–0.704) suggest that intrusions originated from an enriched mantle reservoir. Low 3He/4He ratios in accessory minerals (ilmenite and magnetite) indicate an upper mantle source. Large-scale correlations link the Fennoscandian Shield with the Superior and Wyoming cratons. |
format |
Text |
author |
Tamara Bayanova Aleksey Korchagin Alexander Mitrofanov Pavel Serov Nadezhda Ekimova Elena Nitkina Igor Kamensky Dmitry Elizarov Milosh Huber |
author_facet |
Tamara Bayanova Aleksey Korchagin Alexander Mitrofanov Pavel Serov Nadezhda Ekimova Elena Nitkina Igor Kamensky Dmitry Elizarov Milosh Huber |
author_sort |
Tamara Bayanova |
title |
Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
title_short |
Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
title_full |
Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
title_fullStr |
Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
title_full_unstemmed |
Long-Lived Mantle Plume and Polyphase Evolution of Palaeoproterozoic PGE Intrusions in the Fennoscandian Shield |
title_sort |
long-lived mantle plume and polyphase evolution of palaeoproterozoic pge intrusions in the fennoscandian shield |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2019 |
url |
https://doi.org/10.3390/min9010059 |
op_coverage |
agris |
long_lat |
ENVELOPE(30.989,30.989,69.401,69.401) ENVELOPE(33.260,33.260,67.849,67.849) ENVELOPE(27.161,27.161,67.795,67.795) |
geographic |
Pechenga Imandra Koitelainen |
geographic_facet |
Pechenga Imandra Koitelainen |
genre |
Fennoscandian karelia* |
genre_facet |
Fennoscandian karelia* |
op_source |
Minerals; Volume 9; Issue 1; Pages: 59 |
op_relation |
Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min9010059 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min9010059 |
container_title |
Minerals |
container_volume |
9 |
container_issue |
1 |
container_start_page |
59 |
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1774717495883595776 |