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    <journal-meta>
      <journal-id journal-id-type="issn">2411-3336</journal-id>
      <journal-id journal-id-type="eissn">2541-9404</journal-id>
      <journal-title-group>
        <journal-title xml:lang="ru">Записки Горного института</journal-title>
        <journal-title xml:lang="en">Journal of Mining Institute</journal-title>
      </journal-title-group>
      <publisher>
        <publisher-name xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины ΙΙ</publisher-name>
        <publisher-name xml:lang="en">Empress Catherine II Saint Petersburg Mining University</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id custom-type="edn" pub-id-type="custom">VTXHPQ</article-id>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-16525</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/16525</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Геология</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Geology</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Minerals of the crichtonite group in ooids of mineralized volcaniclastic rocks from the Rudnogorskoe iron deposit (Eastern Siberia)</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Минералы группы кричтонита в оолитах оруденелых вулканокластитов Рудногорского железорудного месторождения (Восточная Сибирь)</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author" corresp="yes">
          <name name-style="eastern">
            <surname>Ayupova</surname>
            <given-names>Nuriya R.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Аюпова</surname>
              <given-names>Н. Р.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Ayupova</surname>
              <given-names>Nuriya R.</given-names>
            </name>
          </name-alternatives>
          <email>aupova@mineralogy.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0003-0792-1876</contrib-id>
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            <institution xml:lang="ru">Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН (Миасс, Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">South Ural Scientific Centre Mineralogy and Environmental Geology of the Ural Branch RАS (Miass, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Maslennikov</surname>
            <given-names>Valeriy V.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Масленников</surname>
              <given-names>В. В.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Maslennikov</surname>
              <given-names>Valeriy V.</given-names>
            </name>
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          <email>pmi@spmi.ru</email>
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            <institution xml:lang="ru">Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН (Миасс, Россия)</institution>
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          <aff>
            <institution xml:lang="en">South Ural Scientific Centre Mineralogy and Environmental Geology of the Ural Branch RАS (Miass, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Tseluyko</surname>
            <given-names>Aleksandr S.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Целуйко</surname>
              <given-names>А. С.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Tseluyko</surname>
              <given-names>Aleksandr S.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-4524-0337</contrib-id>
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            <institution xml:lang="ru">Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН (Миасс, Россия)</institution>
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          <aff>
            <institution xml:lang="en">South Ural Scientific Centre Mineralogy and Environmental Geology of the Ural Branch RАS (Miass, Russia)</institution>
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        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Yatimov</surname>
            <given-names>Umed A.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Ятимов</surname>
              <given-names>У. А.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Yatimov</surname>
              <given-names>Umed A.</given-names>
            </name>
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          <email>pmi@spmi.ru</email>
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            <institution xml:lang="ru">Южно-Уральский федеральный научный центр минералогии  и геоэкологии УрО РАН (Миасс, Россия)</institution>
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          <aff>
            <institution xml:lang="en">South Ural Scientific Centre Mineralogy and Environmental Geology of the Ural Branch RАS (Miass, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Lebedeva</surname>
            <given-names>Svetlana M.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Лебедева</surname>
              <given-names>С. М.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Lebedeva</surname>
              <given-names>Svetlana M.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-7250-5978</contrib-id>
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            <institution xml:lang="ru">Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН (Миасс, Россия)</institution>
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          <aff>
            <institution xml:lang="en">South Ural Scientific Centre Mineralogy and Environmental Geology of the Ural Branch RАS (Miass, Russia)</institution>
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      <pub-date pub-type="epub" iso-8601-date="2025-09-03">
        <day>03</day>
        <month>09</month>
        <year>2025</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>2025</year>
      </pub-date>
      <volume>276</volume>
      <issue>1</issue>
      <fpage>157</fpage>
      <lpage>171</lpage>
      <history>
        <date date-type="received" iso-8601-date="2024-06-26">
          <day>26</day>
          <month>06</month>
          <year>2024</year>
        </date>
        <date date-type="accepted" iso-8601-date="2025-04-10">
          <day>10</day>
          <month>04</month>
          <year>2025</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="2025-12-29">
          <day>29</day>
          <month>12</month>
          <year>2025</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 2025 Н. Р. Аюпова, В. В. Масленников, А. С. Целуйко, У. А. Ятимов, С. М. Лебедева</copyright-statement>
        <copyright-statement xml:lang="en">© 2025 Nuriya R. Ayupova, Valeriy V. Maslennikov, Aleksandr S. Tseluyko, Umed A. Yatimov, Svetlana M. Lebedeva</copyright-statement>
        <copyright-year>2025</copyright-year>
        <copyright-holder xml:lang="ru">Н. Р. Аюпова, В. В. Масленников, А. С. Целуйко, У. А. Ятимов, С. М. Лебедева</copyright-holder>
        <copyright-holder xml:lang="en">Nuriya R. Ayupova, Valeriy V. Maslennikov, Aleksandr S. Tseluyko, Umed A. Yatimov, Svetlana M. Lebedeva</copyright-holder>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="ru">
          <license-p>Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)</license-p>
        </license>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="en">
          <license-p>This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/16525">https://pmi.spmi.ru/pmi/article/view/16525</self-uri>
      <abstract xml:lang="ru">
        <p>Отмечено присутствие минералов группы кричтонита (МГК) в оолитах оруденелых вулканокластитов Рудногорского железорудного месторождения (Восточная Сибирь). Для оолитов характерны концентрически-зональное строение обломочной составляющей, выраженное в последовательной смене зон: гематит-смектитовое ядро → смектит-хлоритовая → хлорит-гранатовая → апатит-хлоритовая зоны, и обволакивающая обломок тонкослоистая магнетитовая кайма. Редкие кристаллические агрегаты минералов группы кричтонита в оолитах выявлены в периферийной апатит-хлоритовой зоне обломков перед магнетитовой каймой. По химическому составу и КР-спектрам МГК диагностированы как кричтонит и давидит-Ce. В составе кричтонита определены, мас.%: TiO2 63,73-70,69, FeO 18,03-23,58, SrO 2,24-4,03, CaO 2,22-4,10, MgO 0,33-1,02, Al2O3 до 2,01, MnO до 0,54 и Ce2O3 до 1,88. Давидит-Ce обычно сосредоточен по краям кричтонита и содержит, мас.%: TiO2 60,54-62,28, FeO 22,67-25,77, Ce2O3 3,18-5,20, La2O3 2,47-2,74 и SrO 0,58-0,64. В МГК отмечается присутствие UO2 до 4,69 мас.%. Установлены сложные процессы разрушения МГК и замещения анатазом с выделением собственных минеральных фаз РЗЭ (анзаит-Ce) и U (уранинит) и последующего превращения анатаза в рутил. Последовательность минералообразования в обломках свидетельствует, что образование и рост кристаллов МГК являются результатом литификации накопленного титана и элементов-примесей в процессах смектитизации базальтовых обломков. Дальнейшие процессы преобразования минерального вещества связаны с разложением кричтонита на простые оксиды c отложением собственных минералов РЗЭ и U. Титанит является продуктом завершающих скарновых этапов рудообразования.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>The article reports on the presence of minerals of the crichtonite group (MCG) in ooids of mineralized volcaniclastic rocks of the Rudnogorskoe iron deposit (Eastern Siberia). The ooids are characterized by a concentric-zoned structure of detrital component, expressed in a sequential change of hematite-smectite core → smectite-chlorite → chlorite-garnet → apatite-chlorite zones, which are rimmed by thin-layered magnetite. Rare crystalline MCG aggregates in ooids are found in the peripheral apatite-chlorite zone. Based on the chemical composition and Raman spectra, the MCG are identified as crichtonite and davidite-Ce. The following components are determined in the composition of crichtonite, wt.%: TiO2 63.73-70.69, FeO 18.03-23.58, SrO 2.24-4.03, CaO 2.22-4.10, MgO 0.33-1.02, Al2O3 up to 2.01, MnO up to 0.54 and Ce2O3 up to 1.88. Davidite-Ce typically occurs along the edges of crichtonite and contains, wt.%: TiO2 60.54-62.28, FeO 22.67-25.77, Ce2O3 3.18-5.0, La2O3 2.47-2.74 and SrO 0.58-0.64. The MCG also contain up to 4.69 wt.% UO2. Complex processes of breakdown of MCG and their replacement by anatase are accompanied by the formation of REE (anzaite-Ce) and U (uraninite) minerals and subsequent transformation of anatase to rutile. A sequence of mineral formation of the ooids indicates that the formation and growth of the MCG crystals is a result of lithification of accumulated Ti and trace elements during smectitization of basaltic clasts. Further processes of mineral transformation are associated with the transformation of crichtonite to simple Ti oxides and the precipitation of REE and U minerals. Titanite is a product of the final skarn stages of ore formation.</p>
      </abstract>
      <kwd-group xml:lang="ru">
        <title>Ключевые слова</title>
        <kwd>минералы группы кричтонита</kwd>
        <kwd>анатаз</kwd>
        <kwd>рутил</kwd>
        <kwd>титанит</kwd>
        <kwd>оолиты</kwd>
        <kwd>магнетитовые руды</kwd>
        <kwd>Рудногорское месторождение</kwd>
        <kwd>Восточная Сибирь</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <title>Keywords</title>
        <kwd>minerals of the crichtonite group</kwd>
        <kwd>anatase</kwd>
        <kwd>rutile</kwd>
        <kwd>titanite</kwd>
        <kwd>ooids</kwd>
        <kwd>magnetite ores</kwd>
        <kwd>Rudnogorskoe deposit</kwd>
        <kwd>Eastern Siberia</kwd>
      </kwd-group>
      <funding-group>
        <funding-statement xml:lang="ru">Исследования выполнены в рамках проекта РНФ № 22-17-00215. Полевые работы проводились по госбюджетной теме ЮУ ФНЦ МиГ УрО РАН № 122031600292-6.</funding-statement>
        <funding-statement xml:lang="en">The research was carried out within the framework of the project by the Russian Science Foundation N 22-17-00215. The studies are based on material collected during field works, which were supported by state contract of SUSC MEG UB RAS N 122031600292-6.</funding-statement>
      </funding-group>
    </article-meta>
  </front>
  <body/>
  <back>
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