2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University RYMYTJ pmi-16079 https://pmi.spmi.ru/pmi/article/view/16079 Геология Geology New data on the composition of growth medium of fibrous diamonds from the placers of the Western Urals Новые данные о составе среды кристаллизации волокнистых алмазов из россыпей Западного Урала Gubanov Nikolai V. Губанов Н. В. Gubanov Nikolai V. goubanov97@gmail.com 0000-0002-0718-8021 Институт геологии и геохимии им. академика А.Н.Заварицкого УрО РАН (Екатеринбург, Россия) Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the RAS (Ekaterinburg, Russia) Zedgenizov Dmitrii A. Зедгенизов Д. А. Zedgenizov Dmitrii A. zedgenizov@igg.uran.ru 0000-0002-5934-9122 Институт геологии и геохимии им. академика А.Н.Заварицкого УрО РАН (Екатеринбург, Россия) Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the RAS (Ekaterinburg, Russia) Vasilev Evgenii A. Васильев Е. А. Vasilev Evgenii A. vasilev_ea@pers.spmi.ru 0000-0003-2216-0956 Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) Naumov Vladimir A. Наумов В. А. Naumov Vladimir A. naumov@psu.ru 0000-0002-2824-1012 Институт геологии и геохимии им. академика А.Н.Заварицкого УрО РАН (Екатеринбург, Россия) Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the RAS (Ekaterinburg, Russia) 05 09 2023 2023 263 645 656 29 11 2022 02 03 2023 27 10 2023 © Nikolai V. Gubanov, Dmitrii A. Zedgenizov, Evgenii A. Vasilev, Vladimir A. Naumov 2023 Н. В. Губанов, Д. А. Зедгенизов, Е. А. Васильев, В. А. Наумов Nikolai V. Gubanov, Dmitrii A. Zedgenizov, Evgenii A. Vasilev, Vladimir A. Naumov CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/16079

В настоящей работе приведены результаты изучения микровключений флюидов/расплавов в алмазах из россыпей Красновишерского района (западный склон Среднего/Северного Урала), позволяющие установить эволюцию алмазообразующих сред в субконтинентальной литосферной мантии восточной окраины Восточно-Европейского кратона. По характеристикам дефектно-примесного состава изученные кристаллы представлены тремя разными типами, образование которых было связано с независимыми метасоматическими событиями. Микровключения в алмазах В-типа, содержащих А и В1 азотные дефектные центры, отражают более древний метасоматический этап, характеризующийся ведущей ролью силикатных и низко-Mg карбонатных флюидов/расплавов. Второй этап ассоциирован с ростом алмазов А-типа, содержащих азот исключительно в форме А-центров. На этом этапе образование алмазов было связано с низко-Mg карбонатными средами, более обогащенными MgO, CaO, CO2 и Na2O по сравнению с алмазами В-типа. Третий этап, вероятно, предшествовал извержению транспортирующего мантийного расплава и привел к образованию алмаза С-типа, содержащего А и С азотные дефектные центры и микровключения силикатно-карбонатного состава. Зафиксированный тренд эволюции алмазообразующих флюидов/расплавов направлен в сторону более карбонатных составов. Предполагаемым источником флюидов/расплавов являются эклогитовые и пироксенитовые мантийные субстраты.

This article presents the results of studying microinclusions of fluids/melts in diamonds from the placers of the Krasnovishersky District (western slope of the Middle/Northern Urals), which make it possible to establish the evolution of diamond-forming media in the subcontinental lithospheric mantle of the eastern margin of the East European craton. Impurity composition of the studied crystals reveals three different types of diamonds, the formation of which was associated with separated metasomatic events. Microinclusions in B-type diamonds containing A and B nitrogen defects reflect an older metasomatic stage characterized by the leading role of silicic and low-Mg carbonatitic fluids/melts. The second stage is associated with the growth of A-type diamonds containing nitrogen exclusively in the form of A-centers. At this stage, the formation of diamonds was related with low-Mg carbonatitic media, more enriched in MgO, CaO, CO2, and Na2O compared to B-type diamonds. The third stage probably preceded the eruption of the transporting mantle melt and led to the formation of C-type diamond containing A and C nitrogen defect centers and microinclusions of silicic to low-Mg carbonatitic composition. The recorded trend in the evolution of diamond-forming fluids/melts is directed towards more carbonatitic compositions. Fluids/melts are probably sourced from eclogitic and pyroxenitic mantle substrates.

 Ключевые слова алмаз азот степень агрегации микровключения флюид эклогит литосферная мантия Восточно-Европейский кратон Keywords diamond nitrogen aggregation state microinclusions fluid eclogite lithospheric mantle East European craton Работа поддержана Российским научным фондом, аналитические исследования и обработка данных осуществлялись за счет средств гранта № 22-17-00177, отбор образцов и изготовление препаратов проводились в рамках проекта № 21-77-20026. The study was financially supported by the Russian Science Foundation. Analytical studies and data processing were carried out at the expense of the grant N 22-17-00177; sample preparation was performed under the project N 21-77-20026. O’Reilly S.Y., Griffin W.L. Mantle Metasomatism // Metasomatism and the Chemical Transformation of Rock. Heidelberg: Springer, 2013. P. 471-533. DOI: 10.1007/978-3-642-28394-9_12 O’Reilly S.Y., Griffin W.L. Mantle Metasomatism. Metasomatism and the Chemical Transformation of Rock. 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