aariПроблемы Арктики и АнтарктикиArctic and Antarctic Research0555-26482618-6713Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт10.30758/0555-2648-2024-70-4-428-443aari-663Research ArticleГЕОЛОГИЯ И ГЕОФИЗИКАGEOLOGY AND GEOPHYSICSMineral inclusions in the accretion ice above Lake VostokMineral inclusions in the accretion ice above Lake Vostokhttps://orcid.org/0000-0001-6316-8511LeitchenkovG. L.LeitchenkovG. L.

Санкт-Петербург

German L. Leitchenkov

St. Petersburg

leichenkov@vniio.ruhttps://orcid.org/0000-0001-5201-1922RodionovN. V.RodionovN. V.

Санкт-Петербург

Nikolay V. Rodionov

St. Petersburg

AntonovA. V.AntonovA. V.

Санкт-Петербург

Anton V. Antonov

St. Petersburg

https://orcid.org/0000-0002-6127-748XKrupskayaV. V.KrupskayaV. V.

Москва

Victoria V. Krupskaya

Moscow

https://orcid.org/0000-0002-9914-1326KryuchkovaL. Y.KryuchkovaL. Y.

Санкт-Петербург

Lyudmila Y. Kryuchkova

St. Petersburg

Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана им. академика И.С. Грамберга (ФГБУ «ВНИИОкеангеология»); Санкт-Петербургский государственный университет (СПбГУ)РоссияAll-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia); St. Petersburg State UniversityRussian FederationВсероссийский научно-исследовательский институт им. А.П. Карпинского (ФГБУ ВСЕГЕИ)РоссияRussian Geological Institute (VSEGEI)Russian FederationИнститут геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук (ИГЕМ РАН)РоссияInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM) RASRussian FederationСанкт-Петербургский государственный университет (СПбГУ)РоссияSt. Petersburg State UniversityRussian Federation202421122024704Специальный выпуск Исследования подледникового озера Восток428443Copyright © Leitchenkov G.L., Rodionov N.V., Antonov A.V., Krupskaya V.V., Kryuchkova L.Y., 20242024Leitchenkov G.L., Rodionov N.V., Antonov A.V., Krupskaya V.V., Kryuchkova L.Y.Leitchenkov G.L., Rodionov N.V., Antonov A.V., Krupskaya V.V., Kryuchkova L.Y.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.aaresearch.science/jour/article/view/663

Статья основана на дополнительных исследованиях минеральных включений в кернах аккреационного льда скважины 5Г на станции Восток в Центральной Антарктиде. Исследования включают рентгеновскую микротомографию двух минеральных включений с определением их минерального состава, анализ глинистых минералов в агрегате крупного включения и геохронологическое изучение зерен циркона. Рентгеновская микротомография показывает неповрежденную морфологию включений в ледяном керне и их внутреннюю текстуру. На основании анализа микрофотографий можно предположить, что обломок породы был захвачен в зоне налегания льда на мелководном участке озера Восток, расположенном выше по течению льда от станции Восток, и затем некоторое время находился в водном кармане с мелкозернистой взвесью, которая оседала на поверхности обломка. Агрегат крупного включения характеризуется преобладанием иллита (69 %), промежуточными концентрациями хлорита (24 %) и относительно небольшим количеством каолинита (7 %). Примечательным является отсутствие смешаннослоистых глинистых минералов, характерных для прибрежных районов Антарктики. Наиболее ценная информация получена из новых геохронологических данных и их интеграции с предыдущими данными датирования. U-Pb возраст детритовых зерен циркона показывает лавные пики на рубежах 900, 1000 и 1100 млн лет, в то время как возраст зерен монацита в основном сгруппирован между 1250 и 1450 млн лет с одним пиком вероятности на рубеже 1100 млн лет. Доминирующая возрастная группа зерен циркона между 900 и 1100 млн лет хорошо согласуется с главной фазой рейнерской орогении, проявленной в Восточной Антарктиде между Землей Королевы Мод и Землей Королевы Мэри, хотя подледные горы Гамбурцева можно рассматривать как более вероятный источник сноса. Зерна монацита, вероятно, отвечают ранней фазе рейнерской орогении.

The paper is based on additional studies of mineral inclusions in the accretion ice sampled by deep drilling at Vostok Station in central Antarctica. The studies include X-ray microtomography of two mineral inclusions with identification of their mineral composition; analysis of clay minerals in the soft aggregate of the largest inclusion; and geochronological study of zircon grains. X-ray microtomography shows intact morphology of the inclusions in the ice core and their internal texture. The soft aggregate of the largest inclusion is characterized by the dominance of illite, intermediate concentrations of chlorite and small amounts of kaolinite. A notable feature is the absence of mixed-layer minerals typical of Antarctic coastal areas. The most valuable information is derived from new geochronological data and their integration with previous dating data. The detrital zircon U-Pb ages show strong probability peaks between 900 and 1100 Ma, while the detrital monazite ages are clustered between 1250 and 1450 Ma. Both of these age intervals correspond to the Rayner Orogeny.

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