Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield)
In 1990, the Sopcheozero Cr deposit was discovered in the Monchegorsk Paleoproterozoic layered mafic-ultramafic layered intrusion (Monchepluton). This stratiform early-magmatic deposit occurs in the middle part of the Dunite Block, which is a member of the Monchepluton layered series. The Cr2O3 aver...
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ftmdpi:oai:mdpi.com:/2075-163X/11/7/772/ 2023-08-20T04:06:27+02:00 Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) Artem V. Mokrushin Valery F. Smol’kin agris 2021-07-16 application/pdf https://doi.org/10.3390/min11070772 EN eng Multidisciplinary Digital Publishing Institute Mineral Deposits https://dx.doi.org/10.3390/min11070772 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 11; Issue 7; Pages: 772 Cr-spinel layered mafic-ultramafic intrusion Sopcheozero deposit Monchepluton Fennoscandian Shield Russia Text 2021 ftmdpi https://doi.org/10.3390/min11070772 2023-08-01T02:12:33Z In 1990, the Sopcheozero Cr deposit was discovered in the Monchegorsk Paleoproterozoic layered mafic-ultramafic layered intrusion (Monchepluton). This stratiform early-magmatic deposit occurs in the middle part of the Dunite Block, which is a member of the Monchepluton layered series. The Cr2O3 average-weighted content in ordinary and rich ores of the deposit is 16.65 and 38.76 wt.%, respectively, at gradually changing concentrations within the rich, ordinary and poor ore types and ore body in general. The ores of the Sopcheozero deposit, having a ratio of Cr2O3/FeOtotal = 0.9–1.7, can serve as raw materials for the refractory and chemical industries. The ore Cr-spinel (magnochromite and magnoalumochromite) is associated with highly magnesian olivine (96–98 Fo) rich in Ni (0.4–1.1 wt.%). It confirms a low S content in the melt and complies with the low oxygen fugacity. The coexisting Cr-spinel-olivine pairs crystallized at temperatures from 1258 to 1163 °C, with accessory Cr-spinel crystallizing at relatively low, while ore Cr-spinel at higher temperatures. The host rock and ore distinguish with widespread plastic deformations of olivine at the postcrystallization phase under conditions of high temperature (above 400 °C) and pressure (5 kbar). At the post magmatic Svecofennian stage (1.84 Ga), the deposit, jointly with the Monchepluton, was subject to diverse tectonic deformations. Text Fennoscandian MDPI Open Access Publishing Monchegorsk ENVELOPE(32.874,32.874,67.940,67.940) Minerals 11 7 772 |
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Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Cr-spinel layered mafic-ultramafic intrusion Sopcheozero deposit Monchepluton Fennoscandian Shield Russia |
spellingShingle |
Cr-spinel layered mafic-ultramafic intrusion Sopcheozero deposit Monchepluton Fennoscandian Shield Russia Artem V. Mokrushin Valery F. Smol’kin Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
topic_facet |
Cr-spinel layered mafic-ultramafic intrusion Sopcheozero deposit Monchepluton Fennoscandian Shield Russia |
description |
In 1990, the Sopcheozero Cr deposit was discovered in the Monchegorsk Paleoproterozoic layered mafic-ultramafic layered intrusion (Monchepluton). This stratiform early-magmatic deposit occurs in the middle part of the Dunite Block, which is a member of the Monchepluton layered series. The Cr2O3 average-weighted content in ordinary and rich ores of the deposit is 16.65 and 38.76 wt.%, respectively, at gradually changing concentrations within the rich, ordinary and poor ore types and ore body in general. The ores of the Sopcheozero deposit, having a ratio of Cr2O3/FeOtotal = 0.9–1.7, can serve as raw materials for the refractory and chemical industries. The ore Cr-spinel (magnochromite and magnoalumochromite) is associated with highly magnesian olivine (96–98 Fo) rich in Ni (0.4–1.1 wt.%). It confirms a low S content in the melt and complies with the low oxygen fugacity. The coexisting Cr-spinel-olivine pairs crystallized at temperatures from 1258 to 1163 °C, with accessory Cr-spinel crystallizing at relatively low, while ore Cr-spinel at higher temperatures. The host rock and ore distinguish with widespread plastic deformations of olivine at the postcrystallization phase under conditions of high temperature (above 400 °C) and pressure (5 kbar). At the post magmatic Svecofennian stage (1.84 Ga), the deposit, jointly with the Monchepluton, was subject to diverse tectonic deformations. |
format |
Text |
author |
Artem V. Mokrushin Valery F. Smol’kin |
author_facet |
Artem V. Mokrushin Valery F. Smol’kin |
author_sort |
Artem V. Mokrushin |
title |
Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
title_short |
Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
title_full |
Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
title_fullStr |
Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
title_full_unstemmed |
Chromite Mineralization in the Sopcheozero Deposit (Monchegorsk Layered Intrusion, Fennoscandian Shield) |
title_sort |
chromite mineralization in the sopcheozero deposit (monchegorsk layered intrusion, fennoscandian shield) |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/min11070772 |
op_coverage |
agris |
long_lat |
ENVELOPE(32.874,32.874,67.940,67.940) |
geographic |
Monchegorsk |
geographic_facet |
Monchegorsk |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Minerals; Volume 11; Issue 7; Pages: 772 |
op_relation |
Mineral Deposits https://dx.doi.org/10.3390/min11070772 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min11070772 |
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Minerals |
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11 |
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7 |
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772 |
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