Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula
An unusual hydrothermal alteration scheme was presented for chevkinite-(Ce) from the White Tundra pegmatite (2656 ± 5 Ma), Keivy massif, Kola Peninsula. Pb-CO2-rich fluids initially removed REE and Y from the chevkinite-(Ce), with enrichment in Pb and U. PbO abundances reaching 17.35 wt%. Continued...
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2022
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ftmdpi:oai:mdpi.com:/2075-163X/12/8/989/ 2023-08-20T04:07:47+02:00 Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula Ray Macdonald Bogusław Bagiński Marcin Stachowicz Dmitry Zozulya Jakub Kotowski Petras Jokubauskas agris 2022-08-03 application/pdf https://doi.org/10.3390/min12080989 EN eng Multidisciplinary Digital Publishing Institute Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min12080989 https://creativecommons.org/licenses/by/4.0/ Minerals; Volume 12; Issue 8; Pages: 989 White Tundra pegmatite Pb-rich chevkinite-(Ce) CO 2 -bearing hydrothermal fluids amorphous Pb-Ti-Fe-Si phase Text 2022 ftmdpi https://doi.org/10.3390/min12080989 2023-08-01T05:57:27Z An unusual hydrothermal alteration scheme was presented for chevkinite-(Ce) from the White Tundra pegmatite (2656 ± 5 Ma), Keivy massif, Kola Peninsula. Pb-CO2-rich fluids initially removed REE and Y from the chevkinite-(Ce), with enrichment in Pb and U. PbO abundances reaching 17.35 wt%. Continued alteration resulted in the altered chevkinite-(Ce) being progressively transformed to a Pb-Ti-Fe-Si phase, which proved, upon EBSD analysis, to be almost totally amorphous. Pb enrichment was accompanied by a loss of LREE, especially La, relative to HREE, and the development of strong positive Ce anomalies. A notably U-rich aeschynite-(Y), with UO2 values ≤7.67 wt%, crystallized along with the chevkinite-(Ce). Aeschynite-(Y) with a lower UO2 value (3.91 wt%) and bastnäsite-(Ce) formed during alteration. The formation of bastnäsite-(Ce) rather than cerussite, which might have been expected in a high Pb-CO2 environment, is ascribed to the fluids being acidic. Text kola peninsula Tundra MDPI Open Access Publishing Kola Peninsula Minerals 12 8 989 |
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ftmdpi |
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English |
topic |
White Tundra pegmatite Pb-rich chevkinite-(Ce) CO 2 -bearing hydrothermal fluids amorphous Pb-Ti-Fe-Si phase |
spellingShingle |
White Tundra pegmatite Pb-rich chevkinite-(Ce) CO 2 -bearing hydrothermal fluids amorphous Pb-Ti-Fe-Si phase Ray Macdonald Bogusław Bagiński Marcin Stachowicz Dmitry Zozulya Jakub Kotowski Petras Jokubauskas Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
topic_facet |
White Tundra pegmatite Pb-rich chevkinite-(Ce) CO 2 -bearing hydrothermal fluids amorphous Pb-Ti-Fe-Si phase |
description |
An unusual hydrothermal alteration scheme was presented for chevkinite-(Ce) from the White Tundra pegmatite (2656 ± 5 Ma), Keivy massif, Kola Peninsula. Pb-CO2-rich fluids initially removed REE and Y from the chevkinite-(Ce), with enrichment in Pb and U. PbO abundances reaching 17.35 wt%. Continued alteration resulted in the altered chevkinite-(Ce) being progressively transformed to a Pb-Ti-Fe-Si phase, which proved, upon EBSD analysis, to be almost totally amorphous. Pb enrichment was accompanied by a loss of LREE, especially La, relative to HREE, and the development of strong positive Ce anomalies. A notably U-rich aeschynite-(Y), with UO2 values ≤7.67 wt%, crystallized along with the chevkinite-(Ce). Aeschynite-(Y) with a lower UO2 value (3.91 wt%) and bastnäsite-(Ce) formed during alteration. The formation of bastnäsite-(Ce) rather than cerussite, which might have been expected in a high Pb-CO2 environment, is ascribed to the fluids being acidic. |
format |
Text |
author |
Ray Macdonald Bogusław Bagiński Marcin Stachowicz Dmitry Zozulya Jakub Kotowski Petras Jokubauskas |
author_facet |
Ray Macdonald Bogusław Bagiński Marcin Stachowicz Dmitry Zozulya Jakub Kotowski Petras Jokubauskas |
author_sort |
Ray Macdonald |
title |
Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
title_short |
Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
title_full |
Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
title_fullStr |
Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
title_full_unstemmed |
Extreme Alteration of Chevkinite-(Ce) by Pb-CO2-Rich Fluids: Evidence from the White Tundra Pegmatite, Keivy Massif, Kola Peninsula |
title_sort |
extreme alteration of chevkinite-(ce) by pb-co2-rich fluids: evidence from the white tundra pegmatite, keivy massif, kola peninsula |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/min12080989 |
op_coverage |
agris |
geographic |
Kola Peninsula |
geographic_facet |
Kola Peninsula |
genre |
kola peninsula Tundra |
genre_facet |
kola peninsula Tundra |
op_source |
Minerals; Volume 12; Issue 8; Pages: 989 |
op_relation |
Crystallography and Physical Chemistry of Minerals & Nanominerals https://dx.doi.org/10.3390/min12080989 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/min12080989 |
container_title |
Minerals |
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12 |
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8 |
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989 |
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