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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 pub-id-type="doi">10.31897/PMI.2022.41</article-id>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-15811</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15811</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">U-Pb (SHRIMP-RG) age of zircon from rare-metal (Li, Cs)  pegmatites of the Okhmylk deposit of the Kolmozero-Voron’ya greenstone belt (northeast of the Fennoscandian shield)</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>U-Pb (SHRIMP-RG) возраст циркона из редкометалльных (Li, Cs) пегматитов месторождения Охмыльк зеленокаменного пояса Колмозеро-Воронья (северо-восток Фенноскандинавского щита)</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author" corresp="yes">
          <name name-style="eastern">
            <surname>Kudryashov</surname>
            <given-names>Nikolay M.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Кудряшов</surname>
              <given-names>Н. М.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Kudryashov</surname>
              <given-names>Nikolay M.</given-names>
            </name>
          </name-alternatives>
          <email>nik@geoksc.apatity.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0003-0918-0995</contrib-id>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru">Геологический институт Кольского научного центра РАН (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology Kola Science Center RAS (Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Udoratina</surname>
            <given-names>Oksana V.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Удоратина</surname>
              <given-names>О. В.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Udoratina</surname>
              <given-names>Oksana V.</given-names>
            </name>
          </name-alternatives>
          <email>udoratina@geo.komisc.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0001-9956-6271</contrib-id>
          <xref ref-type="aff" rid="aff2"/>
        </contrib>
        <aff-alternatives id="aff2">
          <aff>
            <institution xml:lang="ru">Институт геологии Коми научного центра Уральского отделения РАН (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology Komi Science Center of Ural Branch RAS (Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Kalinin</surname>
            <given-names>Arkady A.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Калинин</surname>
              <given-names>А. А.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Kalinin</surname>
              <given-names>Arkady A.</given-names>
            </name>
          </name-alternatives>
          <email>kalinin@geoksc.apatity.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0003-4952-0333</contrib-id>
          <xref ref-type="aff" rid="aff3"/>
        </contrib>
        <aff-alternatives id="aff3">
          <aff>
            <institution xml:lang="ru">Геологический институт Кольского научного центра РАН (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology Kola Science Center RAS (Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Lyalina</surname>
            <given-names>Lyudmila M.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Лялина</surname>
              <given-names>Л. М.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Lyalina</surname>
              <given-names>Lyudmila M.</given-names>
            </name>
          </name-alternatives>
          <email>lialina@geoksc.apatity.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-5875-5348</contrib-id>
          <xref ref-type="aff" rid="aff4"/>
        </contrib>
        <aff-alternatives id="aff4">
          <aff>
            <institution xml:lang="ru">Геологический институт Кольского научного центра РАН (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology Kola Science Center RAS (Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Selivanova</surname>
            <given-names>Ekaterina A.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Селиванова</surname>
              <given-names>Е. А.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Selivanova</surname>
              <given-names>Ekaterina A.</given-names>
            </name>
          </name-alternatives>
          <email>selivanovak@geoksc.apatity.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-1116-7549</contrib-id>
          <xref ref-type="aff" rid="aff5"/>
        </contrib>
        <aff-alternatives id="aff5">
          <aff>
            <institution xml:lang="ru">Геологический институт Кольского научного центра РАН (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology Kola Science Center RAS (Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Grove</surname>
            <given-names>Marty J.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Гроув</surname>
              <given-names>М. Дж.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Grove</surname>
              <given-names>Marty J.</given-names>
            </name>
          </name-alternatives>
          <email>marty.j.grove@gmail.com</email>
          <contrib-id contrib-id-type="orcid">0000-0002-7536-0559</contrib-id>
          <xref ref-type="aff" rid="aff6"/>
        </contrib>
        <aff-alternatives id="aff6">
          <aff>
            <institution xml:lang="ru">Стэнфордский университет (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Stanford University (Russia)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="2022-07-26">
        <day>26</day>
        <month>07</month>
        <year>2022</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>2022</year>
      </pub-date>
      <volume>255</volume>
      <fpage>448</fpage>
      <lpage>454</lpage>
      <history>
        <date date-type="received" iso-8601-date="2022-04-18">
          <day>18</day>
          <month>04</month>
          <year>2022</year>
        </date>
        <date date-type="accepted" iso-8601-date="2022-05-25">
          <day>25</day>
          <month>05</month>
          <year>2022</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="2022-07-26">
          <day>26</day>
          <month>07</month>
          <year>2022</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 2022 Н. М. Кудряшов, О. В. Удоратина, А. А. Калинин, Л. М. Лялина, Е. А. Селиванова, М. Дж. Гроув</copyright-statement>
        <copyright-statement xml:lang="en">© 2022 Nikolay M. Kudryashov, Oksana V. Udoratina, Arkady A. Kalinin, Lyudmila M. Lyalina, Ekaterina A. Selivanova, Marty J. Grove</copyright-statement>
        <copyright-year>2022</copyright-year>
        <copyright-holder xml:lang="ru">Н. М. Кудряшов, О. В. Удоратина, А. А. Калинин, Л. М. Лялина, Е. А. Селиванова, М. Дж. Гроув</copyright-holder>
        <copyright-holder xml:lang="en">Nikolay M. Kudryashov, Oksana V. Udoratina, Arkady A. Kalinin, Lyudmila M. Lyalina, Ekaterina A. Selivanova, Marty J. Grove</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/15811">https://pmi.spmi.ru/pmi/article/view/15811</self-uri>
      <abstract xml:lang="ru">
        <p>Приведены результаты изотопно-геохронологического изучения циркона из редкометалльных пегматитов месторождения Охмыльк. Достоверные данные о возрасте лепидолит-сподумен-поллуцитовых пегматитов этого и других пространственно расположенных в пределах архейского зеленокаменного пояса Колмозеро-Воронья месторождений отсутствовали. Предполагаемые оценки указывали на широкий временной диапазон, укладывающийся в период 2,7-1,8 млрд лет. Циркон в исследованных пегматитах характеризуется внутрифазовой неоднородностью, где выделяются центральные и краевые зоны. В центральных зонах наблюдаются незначительные изменения, они имеют пятнистую структуру и обогащены включениями оксидов урана. По результатам рентгеноструктурного анализа в этих зонах полностью сохранилась кристалличность циркона. В краевых зонах циркона произошла полная перекристаллизация с изменением первоначальной U-Pb изотопной системы. Новые U-Pb (по циркону) изотопно-геохронологические данные возрастом 2607±9 млн лет отражают время кристаллизации пегматитовых жил месторождения Охмыльк. Изотопные данные с возрастом ~1,7-1,6 млрд лет указывают на более поздние гидротермально-метасоматические преобразования. Полученные результаты свидетельствуют о неоархейском времени образования месторождения Охмыльк на рубеже 2,65-2,60 млрд лет, отражая глобальную эпоху пегматитообразования, с которой связаны формирования крупнейших мировых редкометалльных месторождений.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>The results of isotopic and geochronological study of zircon from rare-metal pegmatites of the Okhmylk deposit are presented. There were no reliable data on the age of lepidolite-spodumene-pollucite pegmatites of this and the other deposits spatially located within the Archean Kolmozero-Voron’ya greenstone belt. The earlier estimates of the pegmatite age indicate a broad time range from 2.7 to 1.8 Ga. Zircon in the studied pegmatites is characterized by inner heterogeneity, where core and rim zones are distinguished. Minor changes are observed in the core zones, they have a spotted structure and contain numerous uranium oxide inclusions. According to X-ray diffraction analysis, zircon crystallinity is preserved completely in these areas. Complete recrystallization with modification of the original U-Pb isotopic system occurred in the zircon rims. New U-Pb (zircon) isotopic and geochronological data of 2607±9 Ma reflect the time of crystallization of pegmatite veins in the Okhmylk deposit. Isotopic data with ages of ~1.7-1.6 Ga indicate later hydrothermal alteration. The obtained results testify to the Neo-Archean age of the formation of the Okhmylk deposit 2.65-2.60 Ga, reflecting the global age of pegmatite formation and associated the world's largest rare-metal pegmatite deposits.</p>
      </abstract>
      <kwd-group xml:lang="ru">
        <title>Ключевые слова</title>
        <kwd>редкометалльные (Li</kwd>
        <kwd>Cs) пегматиты</kwd>
        <kwd>U-Pb изотопный возраст</kwd>
        <kwd>SHRIMP-RG</kwd>
        <kwd>циркон</kwd>
        <kwd>месторождение Охмыльк</kwd>
        <kwd>Фенноскандинавский щит</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <title>Keywords</title>
        <kwd>rare-metal (Li</kwd>
        <kwd>Cs) pegmatites</kwd>
        <kwd>U-Pb isotopic age</kwd>
        <kwd>SHRIMP-RG</kwd>
        <kwd>zircon</kwd>
        <kwd>Okhmylk deposit</kwd>
        <kwd>Fennoscandian shield</kwd>
      </kwd-group>
    </article-meta>
  </front>
  <body/>
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