gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-2s-0608gtcrust-1458Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВЫДЕЛЕНИЕ ГЕОХИМИЧЕСКИХ МАРКЕРОВ ВУЛКАНИЗМА КЛАСТЕРНЫМ МЕТОДОМ АНАЛИЗА В ДОННЫХ ОТЛОЖЕНИЯХ ТЕРМАЛЬНОГО ОЗЕРА ФУМАРОЛЬНОГО ПО ДАННЫМ РФА-СИIDENTIFICATION OF GEOCHEMICAL MARKERS OF VOLCANISM BY THE CLUSTER ANALYSIS FOR THE BOTTOM SEDIMENTS OF THE THERMAL LAKE FUMAROLNОЕ ACCORDING TO SR-XRFhttps://orcid.org/0000-0001-6978-3662КириченкоИ. С.KirichenkoI. S.

630090, Новосибирск, пр-т Академика Коптюга, 3

Ivan S. Kirichenko

3 Academician Koptyug Ave, Novosibirsk 630090

iskirichenko@igm.nsc.ruhttps://orcid.org/0000-0001-6617-3287ЛазареваЕ. В.LazarevaE. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-8095-4485ЖмодикС. М.ZhmodikS. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian Federation202204052022132608608Copyright © Кириченко И.С., Лазарева Е.В., Жмодик С.М., 20222022Кириченко И.С., Лазарева Е.В., Жмодик С.М.Kirichenko I.S., Lazareva E.V., Zhmodik S.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1458

Проведено послойное сканирование (с шагом 1 мм) донных отложений термального оз. Фумарольного с помощью РФА-СИ (рентгенофлуоресцентный анализ с применением синхротронного излучения). Озеро находится в кальдере вулкана Узон (Камчатка). Разрез донных отложений IV оз. Фумарольного, охватывающий временной интервал с 260 г. н.э. по 2012 г., разнообразен по химическому и минеральному составу, наблюдаются два пирокластических горизонта. Химический состав донных отложений показал наличие различных слоев, в которых концентрируются такие химические элементы, как Ca, Sr, As, Sb, Mo. Кластерный анализ, проведенный для химических элементов, выявил границы слоев, различающихся по геохимическим характеристикам. Границы этих слоев совпадают с горизонтами, выделенными по данным минералогического анализа. При этом статистические методы обработки геохимических данных позволили однозначно выделить пирокластические горизонты по элементному составу. В работе показано, что данные РФА-СИ анализа в совокупности с кластерным анализом можно использовать в качестве способа разделения колонки на слои. Они хорошо согласуются с данными разделения на слои с помощью минералогических методов.

We carried out layer-by-layer scanning (with a step of 1 mm) of the bottom sediments of the thermal lake Fumarolnое with SR-XRF (X-ray fluorescence analysis using synchrotron radiation). The lake is located in the caldera of the Uzon volcano (Kamchatka). The section of the bottom sediments of lake IV Fumarolnое covering the time interval from 260 AD to 2012 is diverse in chemical and mineral composition. Two pyroclastic horizons are observed. The chemical composition of the bottom sediments showed the presence of different layers in which such chemical elements as: Ca, Sr, As, Sb, Mo. Cluster analysis performed for chemical elements revealed the boundaries of layers with different geochemical characteristics. The boundaries of these layers coincide with the horizons identified by mineralogical analysis. At the same time, statistical methods of geochemical data processing allowed unambiguously identifying pyroclastic horizons by elemental composition. We show that the data of SR-XRF analysis in conjunction with cluster analysis can be used to separate the gravity core into layers. The data are in good agreement with the separation data into layers using mineralogical methods.

термальное озерокластерный анализРФА-СИдонные отложенияКамчаткаthermal lakecluster analysisSR-XRFbottom sedimentsKamchatkaГеохимические работы выполнены в рамках государственного задания ИГМ СО РАН им. В.С. Соболева на базе ЦКП Многоэлементных и изотопных исследований СО РАН. Определение содержаний элементов в донных отложениях проводилось c использованием оборудования ЦКП «СЦСТИ» на базе УНУ «Новосибирский ЛСЭ»/«Комплекс ВЭПП-3» в ИЯФ СО РАН.Geochemical works were partially carried out within the framework of the state assignment of the Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences on the basis of the Analytical Center for multi-elemental and isotope research of the SB RAS. 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The authors declare that there are no conflicts of interest present.