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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">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2026-17-2-0885</article-id><article-id custom-type="edn" pub-id-type="custom">WTNMIL</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-2245</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>ПАЛЕОГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PALEOGEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>ПЕРВЫЕ ДАННЫЕ О ВОЗРАСТЕ МЕСТОРОЖДЕНИЙ ИРБИНСКОГО ЖЕЛЕЗОРУДНОГО ПОЛЯ (ВОСТОЧНЫЙ САЯН): РЕЗУЛЬТАТЫ U-Pb (ID-TIMS) ГЕОХРОНОЛОГИЧЕСКИХ ИССЛЕДОВАНИЙ ГРАНАТА</article-title><trans-title-group xml:lang="en"><trans-title>FIRST DATA ON THE AGE OF THE IRBA IRON ORE FIELD (EASTERN SAYAN): U-Pb (ID-TIMS) GEOCHRONOLOGICAL STUDIES OF GARNET</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5877-666X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Калинин</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalinin</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-т Академика Коптюга, 3 </p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-9993-4687</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мазуров</surname><given-names>М. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Mazurov</surname><given-names>M. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-т Академика Коптюга, 3 </p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0529-6499</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Стифеева</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Stifeeva</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург, наб. Макарова, 2 </p></bio><bio xml:lang="en"><p>2 Makarova Emb, Saint Petersburg, 199034</p></bio><email xlink:type="simple">stifeeva.maria@yandex.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/0000-0002-4584-371X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Котов</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Kotov</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург, наб. Макарова, 2 </p></bio><bio xml:lang="en"><p>2 Makarova Emb, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9099-682X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сальникова</surname><given-names>Е. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Salnikova</surname><given-names>E. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург, наб. Макарова, 2 </p></bio><bio xml:lang="en"><p>2 Makarova Emb, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8209-5418</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Руднев</surname><given-names>С. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Rudnev</surname><given-names>S. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-т Академика Коптюга, 3</p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6171-6051</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Плоткина</surname><given-names>Ю. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Plotkina</surname><given-names>Yu. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург, наб. Макарова, 2 </p></bio><bio xml:lang="en"><p>2 Makarova Emb, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2761-2835</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Галанкина</surname><given-names>О. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Galankina</surname><given-names>O. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, Санкт-Петербург, наб. Макарова, 2 </p></bio><bio xml:lang="en"><p>2 Makarova Emb, Saint Petersburg, 199034</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии и минералогии им. В.С. Соболева СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sobolev Institute of Geology and Mineralogy, 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 геологии и геохронологии докембрия РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Precambrian Geology and Geochronology, 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>17</day><month>04</month><year>2026</year></pub-date><volume>17</volume><issue>2</issue><fpage>885</fpage><lpage>885</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Калинин Ю.А., Мазуров М.П., Стифеева М.В., Котов А.Б., Сальникова Е.Б., Руднев С.Н., Плоткина Ю.В., Галанкина О.Л., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Калинин Ю.А., Мазуров М.П., Стифеева М.В., Котов А.Б., Сальникова Е.Б., Руднев С.Н., Плоткина Ю.В., Галанкина О.Л.</copyright-holder><copyright-holder xml:lang="en">Kalinin Y.A., Mazurov M.P., Stifeeva M.V., Kotov A.B., Salnikova E.B., Rudnev S.N., Plotkina Y.V., Galankina O.L.</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.gt-crust.ru/jour/article/view/2245">https://www.gt-crust.ru/jour/article/view/2245</self-uri><abstract><p>Приведены результаты U-Pb (ID-TIMS) геохронологических исследований граната из железорудных скарнов Гранатового месторождения (Ирбинское рудное поле, Восточный Саян). Изученный гранат представлен полихромными зернами. Установлено, что состав изученного граната отвечает андрадиту (98–100 %), однако в пределах отдельных участков краевых зон отмечается появление гроссулярового компонента (не более 5 %). На границе центральной зоны, сложенной гранатом коричневого цвета, и периферии кристаллов наблюдается зона, выполненная гранатом андрадит-гроссулярового состава, где нередко содержание алюминия превышает содержание железа. Проявление полихромной зональности в гранатах из магнетитовых скарнов месторождения Гранатового указывает на сложное сочетание диффузионного и инфильтрационного метасоматоза. На ранних этапах скарнообразования в связи с высокой подвижностью железа в удалении от контакта в экзоскарновой зоне образовался первичный андрадит коричневого цвета. С последующим усилением интенсивности метасоматоза происходило формирование более глиноземистого граната, нарастающего на ранний андрадит. Установленные включения молибденита в гранате являются характерной чертой рудной ассоциации и других железорудных месторождений Восточного Саяна. Проведены исследования фрагментов граната из центральных и внешних зон полихромных зерен. Установлено, что центральные темноокрашенные зоны андрадитового состава более обогащены ураном (25–29 мкг/г) в сравнении с внешними светлоокрашенными зонами, которые демонстрируют гораздо более низкое содержание урана (3.5 мкг/г) и значительную потерю радиогенного свинца (Pbc/Pbt=0.67). В ходе поздних метасоматических процессов гранат испытал температурное воздействие, инициировавшее диффузию свинца во внешних зонах, тогда как в центральных частях U/Pb система осталась практически ненарушенной. Полученные данные являются первой «прямой» оценкой возраста формирования магнетитового оруденения Ирбинского рудного поля (503±6 млн лет; СКВО=1.3). Согласующийся возраст габброидных вулканоплутонических комплексов других областей Алтае-Саянского региона указывает на синхронность проявления раннепалеозойского этапа железорудного рудогенеза в пределах восточного сегмента Алтае-Саянской складчатой области и дает основания выделять железорудную металлогеническую эпоху аккреционно-коллизионного этапа развития Алтае-Саянской складчатой области.</p></abstract><trans-abstract xml:lang="en"><p>The results presented here concern the U-Pb (ID-TIMS) geochronological studies of garnet from ore-bearing skarns of the Granatovoe deposit (Irba ore field, Eastern Sayan). The studied garnet is represented by polychrome grains. It has been found that the studied garnet is similar in composition to andradite (98–100 %), though some of the parts of the marginal zones show the presence of a grossular component (no more than 5 %). On the boundary of the central zone composed of brown garnet and the periphery of the crystals, there is a zone made up of andradite-grossular garnet, where the aluminum content often exceeds the iron content. Polychrome zonation in garnets from magnetite skarns of the Granatovoe deposit reflects a complex combination of diffusion and infiltration metasomatism. High mobility of iron away from the contact in the early stages of skarn formation gave rise to primary brown andradite in the exoskarn zone. A subsequent increase in metasomatism intensity provided formation of high-aluminous garnet and its growth on early andradite. The granite-hosted molybdenite inclusions are a characteristic feature of the ore association and other iron ore deposits of the Eastern Sayan. Studies have been made of garnet fragments from concentrically zoned polychrome grains. It has been found that the central dark-colored zones of andradite composition are more enriched in uranium (25–29 ppm) than the outer light-colored zones which demonstrate a much lower uranium content (3.5 ppm) and a significant loss of radiogenic lead (Pbc/Pbt=0.67). A thermal effect on garnet during the late metasomatic processes caused diffusion of lead in the outer zones, while the U/Pb system remained almost unchanged in the central parts. The data obtained are the first "direct" age estimate of magnetite mineralization of the Irba ore field (503±6 Ma; MSWD=1.3). Age consistency between gabbroid volcanoplutonic complexes in other areas of the Altai-Sayan region suggests a simultaneous occurrence of the Early Paleozoic iron ore mineralization within the eastern segment of the Altai-Sayan folded region and gives grounds to recognize the iron-ore metallogenic epoch at the accretion-collision stage of the Altai-Sayan folded region development.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гранат U-Pb (ID-TIMS)</kwd><kwd>железорудные скарны</kwd><kwd>Восточный Саян</kwd><kwd>Ирбинское рудное поле</kwd><kwd>Алтае-Саянская складчатая область</kwd><kwd>магнетитовое оруденение</kwd><kwd>раннепалеозойские комплексы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>U-Pb garnet (ID-TIMS)</kwd><kwd>ore-bearing skarns</kwd><kwd>Eastern Sayan</kwd><kwd>Irba ore field</kwd><kwd>Altai-Sayan folded region</kwd><kwd>magnetite mineralization</kwd><kwd>Early Paleozoic complexes</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Геологические исследования проведены при поддержке Минобрнауки РФ (тема НИР № FMUW-2025-0002) и в рамках госзадания ИГМ СО РАН (проекты № 122041400237-8 и 122041400044-2). Геохронологические исследования проведены при поддержке РНФ (грант № 22-17-00211П). Работа выполнена с использованием оборудования ЦКП АИРИЗ (ИГГД РАН, г. Санкт-Петербург).</funding-statement><funding-statement xml:lang="en">The geological study was supported by the Ministry of Science and Higher Education of the Russian Federation (research topic No. FMUW- 2025-0002) and on the state assignment of IGM SB RAS (projects No. 122041400237-8 and No. 122041400044-2). The geochronological study was supported by the RSF (project No. 22-17-00211П). The work was conducted using equipment of the Shared Equipment Center AIRES (IPGG RAS, Saint Petersburg).</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">Берзин Н.А., Колман Р.Г., Добрецов Н.Л., Зоненшайн Л.П., Сяо Сючань, Чанг Э.З. 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