georesГеоресурсыGeoresources1608-50431608-5078Georesursy LLC10.18599/grs.2026.2.5geores-586Research ArticleСТАТЬИRESEARCH ARTICLESПоложительная Eu-аномалия в цирконе и проблема идентификации слабо проявленных эндогенных событийPositive Eu-Anomaly in Zircon and the Problem of Identifying Poorly Manifested Endogenic EventsСкубловС. Г.SkublovS. G.

Сергей Геннадьевич Скублов – доктор геол.-минерал. наук, доцент, главный научный сотрудник; профессор

Санкт-Петербург

Sergey G. Skublov – Doctor of Geological-Mineralogical Sciences, Chief Researcher; Professor

St. Petersburg

skublov@yandex.ruАкимоваЕ. Ю.AkimovaE. Yu.

Екатерина Юрьевна Акимова – кандидат геол.-минерал. наук, старший преподаватель, Институт наук о Земле

Санкт-Петербург

Ekaterina Y. Akimova – Candidate of Geological-Mineralogical Sciences, Senior Lecturer, Institute of Earth Sciences

St. Petersburg

СалимгараеваЛ. И.SalimgaraevaL. I.

Ляйсан Ильшатовна Салимгараева – кандидат геол.-минерал. наук, научный сотрудник

Санкт-Петербург

Laysan I. Salimgarayeva – Candidate of Geological-Mineralogical Sciences, Researcher

St. Petersburg

КуричевВ. Г.KurichevV. G.

Владислав Геннадьевич Куричев – аспирант; геолог 2 категории

Санкт-Петербург

Vladislav G. Kurichev – Postgraduate student; Geologist of the 2nd category

St. Petersburg

ВасюкевичК. Е.VasukevichK. E.

Константин Евгеньевич Васюкевич – ведущий геолог

Санкт-Петербург

Konstantin E. Vasyukevich – Leading Geologist

St. Petersburg

Институт геологии и геохронологии докембрия РАН; Санкт-Петербургский горный университет императрицы Екатерины IIРоссияInstitute of Precambrian Geology and Geochronology of the Russian Academy of Sciences; Empress Catherine II Saint Petersburg Mining UniversityRussian FederationСанкт-Петербургский государственный университетРоссияSaint Petersburg State UniversityRussian FederationИнститут геологии и геохронологии докембрия РАНРоссияInstitute of Precambrian Geology and Geochronology of the Russian Academy of SciencesRussian FederationСанкт-Петербургский горный университет императрицы Екатерины II; Всероссийский научно-исследовательский геологический институт имени А.П. КарпинскогоРоссияEmpress Catherine II Saint Petersburg Mining University; Karpinsky Russian Geological InstituteRussian FederationВсероссийский научно-исследовательский геологический институт имени А.П. КарпинскогоРоссияKarpinsky Russian Geological InstituteRussian Federation20262306202628291103Copyright © Скублов С.Г., Акимова Е.Ю., Салимгараева Л.И., Куричев В.Г., Васюкевич К.Е., 20262026Скублов С.Г., Акимова Е.Ю., Салимгараева Л.И., Куричев В.Г., Васюкевич К.Е.Skublov S.G., Akimova E.Y., Salimgaraeva L.I., Kurichev V.G., Vasukevich K.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.geors.ru/jour/article/view/586

Для циркона из силикатного мрамора Хапчанского террейна Анабарского щита и сиенитов сухарнинского комплекса гранитоидов Чукотки установлено проявление положительной Eu-аномалии, крайне редкой для этого минерала. В пробе силикатного мрамора положительная Eu-аномалия установлена для поздней генерации циркона с повышенным содержанием неформульных элементов и летучих компонентов. Возраст циркона по верхнему пересечению – 1954±17 млн лет (гранулитовый метаморфизм), нижнее пересечение – 984±49 млн лет (тектонотермальное событие). Циркон с положительной Eu-аномалией тяготеет к нижнему пересечению дискордии, что указывает на связь с поздним воздействием флюидов. Циркон из сиенитов отличается черными высокоурановыми краевыми зонами с положительной Eu-аномалией и обогащением элементами-примесями. Весь циркон образует кластер с конкордантным возрастом около 105 млн лет. Вероятно, возникновение положительной Eu-аномалии в цирконе из сиенитов произошло в результате эволюции закрытой магматической системы, без привлечения стороннего флюида. Циркон из силикатного мрамора, как представляется, зафиксировал эволюцию состава флюидов: 1) ранний флюид обогащен бором и был преимущественно водным, вероятно, мобилизованным из первично-осадочного протолита силикатных мраморов; 2) последующий, предположительно оторванный во времени от гранулитового метаморфизма, был обогащен галогенами (фтором и хлором), что нашло отражение в составе поздних генераций циркона. В работе показано, что нижнее пересечение дискордии, опирающееся на отдельные генерации циркона с особыми геохимическими характеристиками (содержание и спектры REE, амплитуда и знак Се- и Eu-аномалии, содержание неформульных элементов-примесей, Th/U отношение), может отражать реальное геологическое событие, а не является аналитическим артефактом.

A positive Eu-anomaly, extremely rare for this mineral, has been found for zircon from the silicate marbles of the Khapchan terrane of the Anabar Shield and syenites of the Sukharninsky complex of granitoids of Chukotka. In the silicate marble sample, a positive Eu-anomaly was found for late generation of zircon with an increased content of non-formula elements and volatile components. The age of zircon at the upper intersection is 1954±17 Ma (granulite metamorphism), the lower intersection is 984±49 Ma (tectonothermal event). Zircon with a positive Eu-anomaly tends to the lower intersection of discordia, which indicates a connection with late exposure to fluids. Zircon from syenites is characterized by black high-uranium marginal zones with a positive Eu-anomaly and enrichment with trace elements. The entire zircon forms a cluster with a concordant age of about 105 Ma. It is likely that the occurrence of a positive Eu-anomaly in zircon from syenites occurred as a result of the evolution of a closed magmatic system, without the involvement of an outside fluid. Zircon from silicate marble appears to have recorded the evolution of fluid composition: 1) the early fluid was enriched in boron and was predominantly aqueous, probably mobilized from the primary sedimentary protolith of silicate marbles; 2) the subsequent one, presumably separated in time from granulite metamorphism, was enriched in halogens (fluorine and chlorine), which was reflected in the composition of the late zircon generations. The paper shows that the lower intersection of the discordia, based on individual zircon generations with special geochemical characteristics (the content and spectra of REE, the amplitude and sign of the Ce- and Eu-anomalies, the content of non-formula trace elements, Th/U ratio), is very likely related to a real geological event rather than an analytical artifact.

цирконредкоземельные элементыEu-аномалиягеохронологияU-Pb методzirconrare-earth elementsEu-anomalygeochronologyU-Pb methodработа выполнена в рамках темы государственного задания ИГГД РАН (FMUW-2022-0005).The work was carried out within the framework of the topic of the state assignment of the IPGG RAS (FMUW-2022-0005).ReferencesГусев Н., Романова Л., Скублов С. (2024). Геохимия и возраст циркона из аккреционной олистостромы хапчанской серии Анабарского щита. Геология и минерально-сырьевые ресурсы Северо-Востока России: материалы XIV Международной научно-практической конференции, посвященной 300-летию Российской Академии наук и 100-летию золотодобывающей промышленности РС(Я), 26-29 марта 2024 г. Якутск: Издательский дом Академии наук РС(Я), с. 307–313.Akimova E.Y., Gusev N.I., Savelev A.D., Donchenko D.R. (2025). Metacarbonate rocks of the Paleoproterozoic Khapchan series (southeastern part of the Anabar Shield): mineral and chemical composition, metamorphic conditions. Journal of Mining Institute, 274, pp. 3–20.Левашова Е.В., Скублов С.Г., Хамдард Н., Иванов М.А, Стативко В.С. (2024). Геохимия циркона из пегматитоносных лейкогранитов комплекса Лагман, провинция Нуристан, Афганистан. Russian Journal of Earth Sciences, 24(2), ES2011. https://doi.org/10.2205/2024ES000916Anenburg M., Williams M.J. (2022). Quantifying the tetrad effect, shape components, and Ce–Eu–Gd anomalies in rare earth element patterns. Mathematical Geosciences, 54(1), pp. 47–70. https://doi.org/10.1007/s11004-021-09959-5Сергеева Л.Ю., Скублов С.Г., Гусев Н.И., Мельник А.Е. (2016). Геохимия циркона из гранулитов далдынской серии (Анабарский щит). Записки Российского минералогического общества, 145(6), с. 20–44. Akimova E.Y., Gusev N.I., Savelev A.D., Donchenko D.R. (2025).Bouvier A.S., Ushikubo T., Kita N.T., Cavosie A.J., Kozdon R., Valley J.W. (2012) Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids. Contributions to Mineralogy and Petrology, 163(5), pp. 745–768. https://doi.org/10.1007/s00410-011-0697-1Metacarbonate rocks of the Paleoproterozoic Khapchan series (southeastern part of the Anabar Shield): mineral and chemical composition, metamorphic conditions. Journal of Mining Institute, 274, pp. 3–20.Douville E., Bienvenu P., Charlou J.L., Donval J.P., Fouquet Y., Appriou P., Gamo T. (1999). Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems. Geochimica et Cosmochimica Acta, 63(5), pp. 627–643. https://doi.org/10.1016/S0016-7037(99)00024-1Anenburg M., Williams M.J. (2022). Quantifying the tetrad effect, shape components, and Ce–Eu–Gd anomalies in rare earth element patterns. Mathematical Geosciences, 54(1), pp. 47–70. https://doi.org/10.1007/s11004-021-09959-5Fedotova A.A., Bibikova E.V., Simakin S.G. (2008). Ion-microprobe zircon geochemistry as an indicator of mineral genesis during geochronological studies. Geochemistry International, 46(9), pp. 912–927. https://doi.org/10.1134/S001670290809005XBouvier A.S., Ushikubo T., Kita N.T., Cavosie A.J., Kozdon R., Valley J.W. (2012) Li isotopes and trace elements as a petrogenetic tracer in zircon: insights from Archean TTGs and sanukitoids. Contributions to Mineralogy and Petrology, 163(5), pp. 745–768. https://doi.org/10.1007/s00410-011-0697-1Finch R.J., Hanchar J.M. (2003). Structure and chemistry of zircon and zircon-group minerals. Reviews in Mineralogy and Geochemistry, 53(1), pp. 1–25. https://doi.org/10.2113/0530001Douville E., Bienvenu P., Charlou J.L., Donval J.P., Fouquet Y., Appriou P., Gamo T. (1999). Yttrium and rare earth elements in fluids from various deep-sea hydrothermal systems. Geochimica et Cosmochimica Acta, 63(5), pp. 627–643. https://doi.org/10.1016/S0016-7037(99)00024-1Fowler A.D., Doig R. (1983). The significance of europium anomalies in the REE spectra of granites and pegmatites, Mont Laurier, Quebec. Geochimica et Cosmochimica Acta, 47(6), pp. 1131–1137. https://doi.org/10.1016/0016-7037(83)90243-0Fedotova A.A., Bibikova E.V., Simakin S.G. (2008). Ion-microprobe zircon geochemistry as an indicator of mineral genesis during geochronological studies. Geochemistry International, 46(9), pp. 912–927. https://doi.org/10.1134/S001670290809005XGeisler T., Schleicher H. (2000). Improved U–Th–total Pb dating of zircons by electron microprobe using a simple new background modeling procedure and Ca as a chemical criterion of fluid-induced U-Th-Pb discordance in zircon. Chemical Geology, 163(1–4), pp. 269–285. https://doi.org/10.1016/S0009-2541(99)00099-6Finch R.J., Hanchar J.M. (2003). Structure and chemistry of zircon and zircon-group minerals. Reviews in Mineralogy and Geochemistry, 53(1), pp. 1–25. https://doi.org/10.2113/0530001Gladkochub D.P., Donskaya T.V., Ernst R.E., Pisarevsky S.A., Wingate M.T., Söderlund U. (2016). Proterozoic dyke swarms of the Siberian Craton and their geodynamic implications. Acta Geologica Sinica (English Edition), 90(supp. 1), pp. 6–7. https://doi.org/10.1111/1755-6724.12849Fowler A.D., Doig R. (1983). The significance of europium anomalies in the REE spectra of granites and pegmatites, Mont Laurier, Quebec. Geochimica et Cosmochimica Acta, 47(6), pp. 1131–1137. https://doi.org/10.1016/0016-7037(83)90243-0Grimes C.B., John B.E., Cheadle M.J., Mazdab F.K., Wooden J.L., Swapp S., Schwartz J.J. (2009). On the occurrence, trace element geochemistry, and crystallization history of zircon from in situ ocean lithosphere. Contributions to Mineralogy and Petrology, 158(6), 757–783. https://doi.org/10.1007/s00410-009-0409-2Geisler T., Schleicher H. (2000). Improved U–Th–total Pb dating of zircons by electron microprobe using a simple new background modeling procedure and Ca as a chemical criterion of fluid-induced U-Th-Pb discordance in zircon. Chemical Geology, 163(1–4), pp. 269–285. https://doi.org/10.1016/S0009-2541(99)00099-6Gusev N., Romanova L., Skublov S. (2024). Geochemistry and age of zircon from Khapchan accretional olistostrom of Anabar Shield. Geology and Mineral Resources of the North-East of Russia: Proceedings of the XIV International Scientific and Practical Conference Dedicated to the 300th Anniversary of the Russian Academy of Sciences and the 100th Anniversary of the Gold Mining Industry of the RS(Ya), March 26-29, 2024. Yakutsk: Publishing House of the Academy of Sciences of the RS(Ya), pp. 307–313. (In Russ.)Gladkochub D.P., Donskaya T.V., Ernst R.E., Pisarevsky S.A., Wingate M.T., Söderlund U. (2016). Proterozoic dyke swarms of the Siberian Craton and their geodynamic implications. Acta Geologica Sinica (English Edition), 90(supp. 1), pp. 6–7. https://doi.org/10.1111/1755-6724.12849Hoskin P.W.O. (2005). Trace-element composition of hydrothermal zircon and the alteration of Hadean zircon from the Jack Hills, Australia. Geochimica et Cosmochimica Acta, 69(3), pp. 637–648. https://doi.org/10.1016/J.GCA.2004.07.006Grimes C.B., John B.E., Cheadle M.J., Mazdab F.K., Wooden J.L., Swapp S., Schwartz J.J. (2009). On the occurrence, trace element geochemistry, and crystallization history of zircon from in situ ocean lithosphere. Contributions to Mineralogy and Petrology, 158(6), 757–783. https://doi.org/10.1007/s00410-009-0409-2Hoskin P.W., Schaltegger U. (2003). The composition of zircon and igneous and metamorphic petrogenesis. Reviews in Mineralogy and Geochemistry, 53(1), pp. 27–62. https://doi.org/10.2113/0530027Hoskin P.W.O. (2005). Trace-element composition of hydrothermal zircon and the alteration of Hadean zircon from the Jack Hills, Australia. Geochimica et Cosmochimica Acta, 69(3), pp. 637–648. https://doi.org/10.1016/J.GCA.2004.07.006Ireland T.R., Williams I.S. (2003). Considerations in zircon geochronology by SIMS. Reviews in Mineralogy and Geochemistry, 53(1), pp. 215–241. https://doi.org/10.2113/0530215Hoskin P.W., Schaltegger U. (2003). The composition of zircon and igneous and metamorphic petrogenesis. Reviews in Mineralogy and Geochemistry, 53(1), pp. 27–62. https://doi.org/10.2113/0530027Kheraskova T.N., Bush V.A., Didenko A.N., Samygin S.G. (2010). Breakup of Rodinia and early stages of evolution of the Paleoasian ocean. Geotectonics, 44(1), pp. 3–24. https://doi.org/10.1134/S0016852110010024Ireland T.R., Williams I.S. (2003). Considerations in zircon geochronology by SIMS. Reviews in Mineralogy and Geochemistry, 53(1), pp. 215–241. https://doi.org/10.2113/0530215Kudryashov N.M., Skublov S.G., Galankina O.L., Udoratina O.V., Voloshin A.V. (2020). Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula). Geochemistry, 80(3), 125489. https://doi.org/10.1016/j.geoch.2018.12.001Kheraskova T.N., Bush V.A., Didenko A.N., Samygin S.G. (2010). Breakup of Rodinia and early stages of evolution of the Paleoasian ocean. Geotectonics, 44(1), pp. 3–24. https://doi.org/10.1134/S0016852110010024Levashova E.V., Mamykina M.E., Skublov S.G., Galankina O.L., Li Q.L., Li X.H. (2023). Geochemistry (TE, REE, Oxygen) of zircon from leucogranites of the Belokurikhinsky Massif, Gorny Altai, as indicator of formation conditions. Geochemistry International, 61(13), pp. 1323–1339. https://doi.org/10.1134/S001670292311006XKudryashov N.M., Skublov S.G., Galankina O.L., Udoratina O.V., Voloshin A.V. (2020). Abnormally high-hafnium zircon from rare-metal pegmatites of the Vasin-Mylk deposit (the northeastern part of the Kola Peninsula). Geochemistry, 80(3), 125489. https://doi.org/10.1016/j.geoch.2018.12.001Levashova E.V., Skublov S. G., Hamdard N., Ivanov M.A., Stativko V.S. (2024). Geochemistry of zircon from pegmatite-bearing leucogranites of the Laghman Complex, Nuristan Province, Afghanistan. Russian Journal of Earth Sciences, 24(2), ES2011. (In Russ.) https://doi.org/10.2205/2024ES000916Levashova E.V., Mamykina M.E., Skublov S.G., Galankina O.L., Li Q.L., Li X.H. (2023). Geochemistry (TE, REE, Oxygen) of zircon from leucogranites of the Belokurikhinsky Massif, Gorny Altai, as indicator of formation conditions. Geochemistry International, 61(13), pp. 1323–1339. https://doi.org/10.1134/S001670292311006XLoucks R.R., Fiorentini M.L., Henríquez G.J. (2020). New magmatic oxybarometer using trace elements in zircon. Journal of Petrology, 61(3), egaa034. https://doi.org/10.1093/petrology/egaa034Loucks R.R., Fiorentini M.L., Henríquez G.J. (2020). New magmatic oxybarometer using trace elements in zircon. Journal of Petrology, 61(3), egaa034. https://doi.org/10.1093/petrology/egaa034Lukanin O.A., Dernov-Pegarev V.F. (2010). Partitioning of rare earth elements between an aqueous chloride fluid phase and melt during the decompression-driven degassing of granite magmas. Geochemistry International, 48(10), pp. 961–978. https://doi.org/10.1134/S0016702910100022Lukanin O.A., Dernov-Pegarev V.F. (2010). Partitioning of rare earth elements between an aqueous chloride fluid phase and melt during the decompression-driven degassing of granite magmas. Geochemistry International, 48(10), pp. 961–978. https://doi.org/10.1134/S0016702910100022McDonough W.F., Sun S.-S. (1995). The composition of the Earth. Chemical Geology, 120(3–4), pp. 223–253. https://doi.org/10.1016/0009-2541(94)00140-4McDonough W.F., Sun S.-S. (1995). The composition of the Earth. Chemical Geology, 120(3–4), pp. 223–253. https://doi.org/10.1016/0009-2541(94)00140-4Rogova I.V., Stativko V.S., Petrov D.A., Skublov S.G. (2024). Trace element composition of zircons from rapakivi granites of the Gubanov intrusion, the Wiborg massif, as a reflection of the fluid saturation of the melt. Geochemistry International, 62(11), pp. 1123–1136. https://doi.org/10.1134/S0016702924700630Rogova I.V., Stativko V.S., Petrov D.A., Skublov S.G. (2024). Trace element composition of zircons from rapakivi granites of the Gubanov intrusion, the Wiborg massif, as a reflection of the fluid saturation of the melt. Geochemistry International, 62(11), pp. 1123–1136. https://doi.org/10.1134/S0016702924700630Rubatto D. (2002). Zircon trace element geochemistry: partitioning with garnet and the link between U–Pb ages and metamorphism. Chemical Geology, 184(1–2), pp. 123–138. https://doi.org/10.1016/S0009-2541(01)00355-2Rubatto D. (2002). Zircon trace element geochemistry: partitioning with garnet and the link between U–Pb ages and metamorphism. Chemical Geology, 184(1–2), pp. 123–138. https://doi.org/10.1016/S0009-2541(01)00355-2Salimgaraeva L., Berezin A., Sergeev S., Gubanov N., Stetskaya E., Skublov S. (2024). Zircons from eclogite-associated rocks of the Marun–Keu complex, the Polar Urals: Trace elements and U–Pb dating. Geosciences, 14(8), 206. https://doi.org/10.3390/geosciences14080206Salimgaraeva L., Berezin A., Sergeev S., Gubanov N., Stetskaya E., Skublov S. (2024). Zircons from eclogite-associated rocks of the Marun–Keu complex, the Polar Urals: Trace elements and U–Pb dating. Geosciences, 14(8), 206. https://doi.org/10.3390/geosciences14080206Schulz B., Klemd R., Brätz H. (2006). Host rock compositional controls on zircon trace element signatures in metabasites from the Austroalpine basement. Geochimica et Cosmochimica Acta, 70(3), pp. 697–710. https://doi.org/10.1016/j.gca.2005.10.001Schulz B., Klemd R., Brätz H. (2006). Host rock compositional controls on zircon trace element signatures in metabasites from the Austroalpine basement. Geochimica et Cosmochimica Acta, 70(3), pp. 697–710. https://doi.org/10.1016/j.gca.2005.10.001Sergeeva L.Yu., Skublov S.G., Gusev N.I., Mel’nik A.E. (2016). Geochemistry of zircon in granulites of Daldynskaya series,Anabar Shield. Zapiski RMO (Proceedings of the Russian Mineralogical Society), 145(6), 20–44. (In Russ.)Skublov S.G., Berezin A.V., Berezhnaya N.G. (2012). General relations in the trace-element composition of zircons from eclogites with implications for the age of eclogites in the Belomorian Mobile Belt. Petrology, 20(5), pp. 427–449. https://doi.org/10.1134/S0869591112050062Skublov S.G., Berezin A.V., Berezhnaya N.G. (2012). General relations in the trace-element composition of zircons from eclogites with implications for the age of eclogites in the Belomorian Mobile Belt. Petrology, 20(5), pp. 427–449. https://doi.org/10.1134/S0869591112050062Skublov S.G., Gavrilchik A.K., Berezin A.V. (2022). Geochemistry of beryl varieties: comparative analysis and visualization of analytical data by principal component analysis (PCA) and t-distributed stochastic neighbor embedding (t-SNE). Journal of Mining Institute, 255, pp. 455–469. https://doi.org/10.31897/PMI.2022.40Skublov S.G., Gavrilchik A.K., Berezin A.V. (2022). Geochemistry of beryl varieties: comparative analysis and visualization of analytical data by principal component analysis (PCA) and t-distributed stochastic neighbor embedding (t-SNE). Journal of Mining Institute, 255, pp. 455–469. https://doi.org/10.31897/PMI.2022.40Skublov S.G., Gusev N.I., Salimgaraeva L.I., Romanova L.Y. (2024a). Trace element composition of discordant zircon as a reflection of the fluid regime of paleoproterozoic granulite metamorphism (Khapchan terrane, Anabar shield). Geochemistry International, 62(8), pp. 793–804. https://doi.org/10.1134/S0016702924700393Skublov S.G., Gusev N.I., Salimgaraeva L.I., Romanova L.Y. (2024a). Trace element composition of discordant zircon as a reflection of the fluid regime of paleoproterozoic granulite metamorphism (Khapchan terrane, Anabar shield). Geochemistry International, 62(8), pp. 793–804. https://doi.org/10.1134/S0016702924700393Skublov S.G., Myskova T.A., Marin Yu.B., Astaf’ev B.Y., Bogomolov E.S., L’vov P.A. (2013). Geochemistry of zircon rims with different ages in gneisses of the Kola Series (SIMS, SHRIMP-II) and the problem of Early Caledonian thermal activization of the Kola craton. Doklady Earth Sciences, 453(2), pp. 1250–1256. https://doi.org/10.1134/S1028334X13120167Skublov S.G., Myskova T.A., Marin Yu.B., Astaf’ev B.Y., Bogomolov E.S., L’vov P.A. (2013). Geochemistry of zircon rims with different ages in gneisses of the Kola Series (SIMS, SHRIMP-II) and the problem of Early Caledonian thermal activization of the Kola craton. Doklady Earth Sciences, 453(2), pp. 1250–1256. https://doi.org/10.1134/S1028334X13120167Skublov S.G., Petrov D.A., Galankina O.L., Levashova E.V., Rogova I.V. (2023). Th-rich zircon from a pegmatite vein hosted in the Wiborg rapakivi granite massif. Geosciences, 13(12), 362. https://doi.org/10.3390/geosciences13120362Skublov S.G., Petrov D.A., Galankina O.L., Levashova E.V., Rogova I.V. (2023). Th-rich zircon from a pegmatite vein hosted in the Wiborg rapakivi granite massif. Geosciences, 13(12), 362. https://doi.org/10.3390/geosciences13120362Skublov S.G., Terekhov E.N., Kuznetsov N.B., Makeyev A.B., Salimgaraeva L.I. (2024b). U–Pb (SHRIMP-II) age of zircon from granites of Bolshoi Tyuters Island (Gulf of Finland, Russia) and the problem of the Ediacaran thermal event in the region. Doklady Earth Sciences, 517(1). pp. 1165–1176. https://doi.org/10.1134/S1028334X24601573Skublov S.G., Terekhov E.N., Kuznetsov N.B., Makeyev A.B., Salimgaraeva L.I. (2024b). U–Pb (SHRIMP-II) age of zircon from granites of Bolshoi Tyuters Island (Gulf of Finland, Russia) and the problem of the Ediacaran thermal event in the region. Doklady Earth Sciences, 517(1). pp. 1165–1176. https://doi.org/10.1134/S1028334X24601573Skuzovatov S.Y., Shatsky V.S., Wang Q., Ragozin A.L., Kostrovitsky S.I. (2021). Multiple tectonomagmatic reactivation of the unexposed basement in the northern Siberian craton: from Paleoproterozoic orogeny to Phanerozoic kimberlite magmatism. International Geology Review, 64(8), pp. 1119–1138. https://doi.org/10.1080/00206814.2021.1916784Skuzovatov S.Y., Shatsky V.S., Wang Q., Ragozin A.L., Kostrovitsky S.I. (2021). Multiple tectonomagmatic reactivation of the unexposed basement in the northern Siberian craton: from Paleoproterozoic orogeny to Phanerozoic kimberlite magmatism. International Geology Review, 64(8), pp. 1119–1138. https://doi.org/10.1080/00206814.2021.1916784Smelov A.P., Kotov A.B., Sal’nikova E.B., Kovach V.P., Beryozkin V.I., Kravchenko A.A., Dobretsov V.N., Velikoslavinskii S.D., Yakovleva S.Z. (2012). Age and duration of the formation of the Billyakh tectonic melange zone. Anabar Shield. Petrology, 20(3), pp. 286–300. https://doi.org/10.1134/S0869591112030058Smelov A.P., Kotov A.B., Sal’nikova E.B., Kovach V.P., Beryozkin V.I., Kravchenko A.A., Dobretsov V.N., Velikoslavinskii S.D., Yakovleva S.Z. (2012). Age and duration of the formation of the Billyakh tectonic melange zone, Anabar Shield. Petrology, 20(3), pp. 286–300. https://doi.org/10.1134/S0869591112030058Watson E.B., Wark D.A., Thomas J.B. (2006). Crystallization thermometers for zircon and rutile. Contributions to Mineralogy and Petrology, 151(4), pp. 413–433. https://doi.org/10.1007/s00410-006-0068-5Watson E.B., Wark D.A., Thomas J.B. (2006). Crystallization thermometers for zircon and rutile. Contributions to Mineralogy and Petrology, 151(4), pp. 413–433. https://doi.org/10.1007/s00410-006-0068-5Yakymchuk C., Kirkland C.L. (2025). Interpreting europium anomalies in zircon: The importance of source redox. Geochemistry, Geophysics, Geosystems, 26(10), e2025GC012505. https://doi.org/10.1029/2025GC012505Yakymchuk C., Kirkland C.L. (2025). Interpreting europium anomalies in zircon: The importance of source redox. Geochemistry, Geophysics, Geosystems, 26(10), e2025GC012505. https://doi.org/10.1029/2025GC012505Zhao K.D., Jiang S.Y., Ling H.F., Palmer M.R. (2014). Reliability of LA-ICP-MS U-Pb dating of zircons with high U concentrations: A case study from the U-bearing Douzhashan Granite in South China. Chemical Geology, 389, pp. 110–121. https://doi.org/10.1016/j.chemgeo.2014.09.018Zhao K.D., Jiang S.Y., Ling H.F., Palmer M.R. (2014). Reliability of LA-ICP-MS U-Pb dating of zircons with high U concentrations: A case study from the U-bearing Douzhashan Granite in South China. Chemical Geology, 389, pp. 110–121. https://doi.org/10.1016/j.chemgeo.2014.09.018

The authors declare that there are no conflicts of interest present.