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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">nznistu</journal-id><journal-title-group><journal-title xml:lang="ru">Науки о Земле и недропользование</journal-title><trans-title-group xml:lang="en"><trans-title>Earth sciences and subsoil use</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2686-9993</issn><issn pub-type="epub">2686-7931</issn><publisher><publisher-name>Federal State Budget Educational Institution of Higher Education "Irkutsk National Research Technical University"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/2686-9993-2026-49-1-5</article-id><article-id custom-type="edn" pub-id-type="custom">ZPIHKQ</article-id><article-id custom-type="elpub" pub-id-type="custom">nznistu-465</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Ниобиевое оруденение Большетагнинского месторождения (Восточный Саян)</article-title><trans-title-group xml:lang="en"><trans-title>Niobium mineralization of the Bolshetagninskoye deposit (Eastern Sayan)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-4676-3331</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сукнева</surname><given-names>М. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Sukneva</surname><given-names>M. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сукнева Мария Олеговна, инженер-исследователь лаборатории физико-химической петрологии и генетической минералогии; лаборант лаборатории палеогеодинамики</p><p>г. Иркутск</p></bio><bio xml:lang="en"><p>Maria O. Sukneva, Research Engineer of the Laboratory of Physicochemical Petrology and Genetic Mineralogy; Laboratory Assistant of the Laboratory of Paleogeodynamics</p><p>Irkutsk</p></bio><email xlink:type="simple">masha.sukneva@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6220-9980</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Радомская</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Radomskaia</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Радомская Татьяна Алесандровна, кандидат геолого-минералогических наук, научный сотрудник лаборатории физико-химической петрологии и генетической минералогии</p><p>г. Иркутск</p></bio><bio xml:lang="en"><p>Tatiana A. Radomskaia, Cand. Sci. (Geol. &amp; Mineral.), Researcher of the Laboratory of Physicochemical Petrology and Genetic Mineralogy</p><p>Irkutsk</p></bio><email xlink:type="simple">radomskaya@igc.irk.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-3402-5746</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гавриленко</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Gavrilenko</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гавриленко Вероника Владимировна, инженер-исследователь лаборатории физико-химической петрологии и генетической минералогии</p><p>г. Иркутск</p></bio><bio xml:lang="en"><p>Veronika V. Gavrilenko, Research Engineer of the Laboratory of Physicochemical Petrology and Genetic Mineralogy</p><p>Irkutsk</p></bio><email xlink:type="simple">i@verf61.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1107-3179</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чуешова</surname><given-names>А. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Chueshova</surname><given-names>A. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чуешова Анастасия Геннадьевна, младший научный сотрудник лаборатории физико-химической петрологии и генетической минералогии</p><p>г. Иркутск</p></bio><bio xml:lang="en"><p>Anastasia G. Chueshova, Junior Researcher of the Laboratory of Physicochemical Petrology and Genetic Mineralogy</p><p>Irkutsk</p></bio><email xlink:type="simple">trill6521@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геохимии им. А.П. Виноградова Сибирского отделения Российской академии наук; Институт земной коры Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences; Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт геохимии им. А.П. Виноградова Сибирского отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>A.P. Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>15</day><month>06</month><year>2026</year></pub-date><volume>49</volume><issue>1</issue><fpage>55</fpage><lpage>71</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Сукнева М.О., Радомская Т.А., Гавриленко В.В., Чуешова А.Г., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Сукнева М.О., Радомская Т.А., Гавриленко В.В., Чуешова А.Г.</copyright-holder><copyright-holder xml:lang="en">Sukneva M.O., Radomskaia T.A., Gavrilenko V.V., Chueshova A.G.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.nznj.ru/jour/article/view/465">https://www.nznj.ru/jour/article/view/465</self-uri><abstract><p>Большетагнинское месторождение – одно из крупнейших известных эндогенных месторождений, перспективное для освоения ниобиевых руд. Оно приурочено к Зиминскому комплексу ультраосновных щелочных пород и карбонатитов позднерифейского возраста. Целью работы является выявление закономерностей распределения ниобия в породах и рудах Большетагнинского щелочно-ультраосновного карбонатитового массива на разных этапах эндогенного и постмагматического процессов с помощью методов оптико-микроскопического анализа, сканирующей электронной микроскопии, рентгеноспектрального электронно-зондового микроанализа (микрозонд) и рентгенофлуоресцентного анализа. Установлено, что первичные ниобиевые руды относятся к полнокристаллическим апатит-слюдистым и апатит-пирохлоровым породам. Основными минералами – концентраторами ниобия – в этих рудах является фторкальциопирохлор и ферроколумбит, отмечается тесный парагенезис апатита и пирохлора. Остальные (вторичные) типы руд связаны с продуктами изменения пирохлора из первичных руд и образовались вследствие переотложения ниобия в новых геохимических условиях. Вторичные ниобиевые руды представлены кальцитовыми карбонатитами, калишпатовыми и другими метасоматитами. Основные минералы в этих породах с наложенным ниобиевым оруденением – концентраторы ниобия – представлены ниобийсодержащим рутилом, ильменорутилом, ниобийсодержащим гематитом и новообразованным фторкальциопирохлором и ферроколумбитом. Пирохлор среди изученных пород представлен фторкальциопирохлором и уранпирохлором, значительно обогащенным танталом. Неизмененные фторкальциопирохлоры из апатитит-пирохлоровых, апатит-слюдистых пород и кальцит-полевошпатовой породы характеризуются выдержанным составом по CaO, Na2O и SrO. Измененные, гидратированные разности (по вакансии в позиции А) более характерны для метасоматических пород и кальцитовых карбонатитов с наложенной пирохлоровой минерализацией, что отражает разную степень флюидной переработки этих пирохлоров. В результате проведенного исследования выявлено, что ниобиевые руды массива претерпели полифазное многостадийное преобразование, которое выражается в уменьшении содержания рудного компонента и различных оксидных формах нахождения ниобия во вторичных рудах по сравнению с первичными.</p></abstract><trans-abstract xml:lang="en"><p>The Bolshetagninskoye deposit is one of the largest known endogenous deposits,which is promising for niobium ore development. It is confined to the Ziminsky complex of ultramafic alkaline ultramafic alkaline rocks and carbonatites of Late Riphean age. The purpose of the study is to identify the distribution patterns of niobium in rocks and ores of the Bolshetagninskoye alkaline-ultramafic carbonatite massif at different stages of endogenic and postmagmatic processes using the methods of optical microscopy, scanning electron microscopy, X-ray diffraction electron microprobe analysis (microprobe), and X-ray fluorescence analysis. It has been determined that the primary niobium ores belong to holocrystalline apatite-mica and apatite-pyrochlore rocks. The main minerals concentrating niobium in these ores are fluorocalciumpyrochlore and ferrocolumbite. It is noted that a close paragenesis of apatite and pyrochlore has been observed. The remaining (secondary) ore types are associated with pyrochlore alteration products from primary ores and formed as a result of the redeposition of niobium in new geochemical conditions. Secondary niobium ores are represented by calcite carbonatites, potassium feldspar, and other metasomatites. The main minerals in these rocks with superimposed niobium mineralization – niobium concentrators – are presented by niobium-bearing rutile, ilmenorutile, niobium-bearing hematite, newly formed fluorocalciopyrochlore and ferrocolumbite. Among the studied rocks pyrochlore is represented by fluorocalciopyrochlore and uraniumpyrochlore, significantly enriched in tantalum. Unaltered fluorocalciopyrochlores from apatitite-pyrochlore, apatite-mica, and calcite-feldspar rocks are characterized by a consistent composition of CaO, Na2O, and SrO. Altered, hydrated varieties (based on the A-site vacancy) are more characteristic of metasomatic rocks and calcite carbonatites with superimposed pyrochlore mineralization. This reflects varying degrees of fluid processing of these pyrochlores. The conducted study revealed that the niobium ores of the massif underwent a multiphase, multistage transformation, which is represented by a decrease in the ore component content and the presence of different oxide forms of niobium in secondary ores compared to primary ores.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>пирохлор</kwd><kwd>ниобий</kwd><kwd>Большетагнинское месторождение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>pyrochlore</kwd><kwd>niobium</kwd><kwd>Bolshetagninskoye deposit</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках государственного задания по проекту № 0284-2021-0007.</funding-statement><funding-statement xml:lang="en">The research was carried out within the framework of the State assignment project No. 0284-2021-0007.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Atencio D., Andrade M.B., Christy A.G., Giere R., Kartashov P.M. 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