Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 76062 10.2205/2025ES000992 udpltg ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ Sm-Nd System of Rare-Metal Pegmatites of the World-Class Kolmozero Lithium Deposit and Shongui Beryllium Deposit, NW Russia: Geochemical Causes of Disturbance and Nd Mobility Sm-Nd System of Rare-Metal Pegmatites of the World-Class Kolmozero Lithium Deposit and Shongui Beryllium Deposit, NW Russia: Geochemical Causes of Disturbance and Nd Mobility https://orcid.org/0000-0003-0930-0301 Серов Павел Александрович Serov Pavel Alexandrovich p.serov@ksc.ru

кандидат геолого-минералогических наук;

candidate of geological and mineralogical sciences;

 https://orcid.org/0000-0002-8135-936X Морозова Людмила Николаевна Morozova Lyudmila Nikolaevna morozova@vims-geo.ru

кандидат геолого-минералогических наук;

candidate of geological and mineralogical sciences;

 Геологический институт Кольского научного центра Российской Академии Наук Апатиты Россия Geological Institute of the Kola Science Centre of the Russian Academy of Sciences Apatity Russian Federation Всероссийский научно-исследовательский институт минерального сырья им. Н.М. Федоровского Москва Россия All-Russian Scientific-Research Institute of Mineral Resources named after N.M. Fedorovsky Moscow Russian Federation 16 04 2025 16 04 2025 25 3 1 12 21 03 2024 21 01 2025 https://rjes.ru/en/nauka/article/76062/view

The Sm-Nd geochronological study was performed to investigate rare-metal pegmatites from the two unique deposits, i.e., the Kolmozero lithium deposit and Shongui deposit with beryllium mineralization (Kola Peninsula, Russia). For Kolmozero lithium deposit was obtained the Sm-Nd isochrone, corresponding to an age of 1705 ± 60 Ma with high εNd(T ) = +9.1. For Shongui beryllium deposit was obtained the Sm-Nd age, corresponding to an age of 1747 ± 33 Ma with high εNd(T ) = +9.7. This age values are close to the ages of metamorphism obtained earlier by Rb-Sr, K-Ca, and K-Ar methods. Pegmatites are characterized by a wide range of εNd(T ) values from +2 to +16 and 147Sm/144Nd ratios up to 0.3. Possible reasons for disturbance of the Sm-Nd isotope system of pegmatites are analyzed, including multicomponent mixing, fluid influence and metamorphic overprinting. The highly radiogenic signatures of rare metal pegmatites of the Shongui and Kolmozero deposits were found to appear by fractionation of Nd and Sm and their different redistribution with the change of the Sm/Nd ratio. High εNd(T ) values and changes in Sm/Nd ratios indicate the role of REE (rare-earth element) fractionation, while narrow εNd(T ) ranges suggest interaction with fluids during pegmatite formation. These findings emphasize the need for further research into the composition of fluids and their influence on isotope systems.

The Sm-Nd geochronological study was performed to investigate rare-metal pegmatites from the two unique deposits, i.e., the Kolmozero lithium deposit and Shongui deposit with beryllium mineralization (Kola Peninsula, Russia). For Kolmozero lithium deposit was obtained the Sm-Nd isochrone, corresponding to an age of 1705 ± 60 Ma with high εNd(T ) = +9.1. For Shongui beryllium deposit was obtained the Sm-Nd age, corresponding to an age of 1747 ± 33 Ma with high εNd(T ) = +9.7. This age values are close to the ages of metamorphism obtained earlier by Rb-Sr, K-Ca, and K-Ar methods. Pegmatites are characterized by a wide range of εNd(T ) values from +2 to +16 and 147Sm/144Nd ratios up to 0.3. Possible reasons for disturbance of the Sm-Nd isotope system of pegmatites are analyzed, including multicomponent mixing, fluid influence and metamorphic overprinting. The highly radiogenic signatures of rare metal pegmatites of the Shongui and Kolmozero deposits were found to appear by fractionation of Nd and Sm and their different redistribution with the change of the Sm/Nd ratio. High εNd(T ) values and changes in Sm/Nd ratios indicate the role of REE (rare-earth element) fractionation, while narrow εNd(T ) ranges suggest interaction with fluids during pegmatite formation. These findings emphasize the need for further research into the composition of fluids and their influence on isotope systems.

 Kolmozero lithium deposit Shongui beryllium deposit rare-metal pegmatites LCT-type spodumene beryl Sm-Nd age REE Kolmozero lithium deposit Shongui beryllium deposit rare-metal pegmatites LCT-type spodumene beryl Sm-Nd age REE The authors express their gratitude to M. Yu. Sidorov, E. L. Kunakkuzin and I. A. Koval for their assistance during field work. We thank three anonymous reviewers for their constructive comments. This work was supported by the Russian Science Foundation grant 22-17-20002. The methodic and instrumental base of Sm-Nd analysis were supported by state contract of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences (project FMEZ-2024-0004). The authors express their gratitude to M. Yu. Sidorov, E. L. Kunakkuzin and I. A. Koval for their assistance during field work. We thank three anonymous reviewers for their constructive comments. This work was supported by the Russian Science Foundation grant 22-17-20002. The methodic and instrumental base of Sm-Nd analysis were supported by state contract of the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences (project FMEZ-2024-0004).

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