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  <front>
    <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">FJNEDQ</article-id>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-16170</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/16170</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">Microstructural features of chromitites and ultramafic rocks of the Almaz-Zhemchuzhina deposit (Kempirsai massif, Kazakhstan) according to electron backscatter diffraction (EBSD) studies</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Микроструктурные особенности хромититов и ультрамафитов месторождения Алмаз-Жемчужина (Кемпирсайский массив, Казахстан) по данным изучения методом дифракции обратно-рассеянных электронов (EBSD)</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author" corresp="yes">
          <name name-style="eastern">
            <surname>Saveliev</surname>
            <given-names>Dmitrii E.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Савельев</surname>
              <given-names>Д. Е.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Saveliev</surname>
              <given-names>Dmitrii E.</given-names>
            </name>
          </name-alternatives>
          <email>savl71@mail.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0001-8910-6992</contrib-id>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru">Институт геологии УФИЦ РАН (Уфа, Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute of Geology, Ufa Federal Research Centre of the RAS (Ufa, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Sergeev</surname>
            <given-names>Semen N.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Сергеев</surname>
              <given-names>С. Н.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Sergeev</surname>
              <given-names>Semen N.</given-names>
            </name>
          </name-alternatives>
          <email>nikocem17@gmail.com</email>
          <contrib-id contrib-id-type="orcid">0000-0001-5494-390X</contrib-id>
          <xref ref-type="aff" rid="aff2"/>
        </contrib>
        <aff-alternatives id="aff2">
          <aff>
            <institution xml:lang="ru">Институт проблем сверхпластичности металлов РАН (Уфа, Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Institute for Metals Superplasticity Problems of the RAS (Ufa, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Makatov</surname>
            <given-names>Darkhan K.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Макатов</surname>
              <given-names>Д. К.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Makatov</surname>
              <given-names>Darkhan K.</given-names>
            </name>
          </name-alternatives>
          <email>mdk_geo@mail.ru</email>
          <contrib-id contrib-id-type="orcid">0009-0006-5059-2851</contrib-id>
          <xref ref-type="aff" rid="aff3"/>
        </contrib>
        <aff-alternatives id="aff3">
          <aff>
            <institution xml:lang="ru">Карагандинский технический университет имени Абылкаса Сагинова (Караганда, Казахстан)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Abylkas Saginov Karaganda Technical University (Karaganda, Kazakhstan)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="2024-02-08">
        <day>08</day>
        <month>02</month>
        <year>2024</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>2024</year>
      </pub-date>
      <volume>266</volume>
      <fpage>218</fpage>
      <lpage>230</lpage>
      <history>
        <date date-type="received" iso-8601-date="2023-02-27">
          <day>27</day>
          <month>02</month>
          <year>2023</year>
        </date>
        <date date-type="accepted" iso-8601-date="2023-10-25">
          <day>25</day>
          <month>10</month>
          <year>2023</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="2024-04-25">
          <day>25</day>
          <month>04</month>
          <year>2024</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 2024 Д. Е. Савельев, С. Н. Сергеев, Д. К. Макатов</copyright-statement>
        <copyright-statement xml:lang="en">© 2024 Dmitrii E. Saveliev, Semen N. Sergeev, Darkhan K. Makatov</copyright-statement>
        <copyright-year>2024</copyright-year>
        <copyright-holder xml:lang="ru">Д. Е. Савельев, С. Н. Сергеев, Д. К. Макатов</copyright-holder>
        <copyright-holder xml:lang="en">Dmitrii E. Saveliev, Semen N. Sergeev, Darkhan K. Makatov</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/16170">https://pmi.spmi.ru/pmi/article/view/16170</self-uri>
      <abstract xml:lang="ru">
        <p>Методом дифракции обратно-рассеянных электронов изучены микроструктурные особенности главных породообразующих минералов вмещающих ультрамафитов (оливина, ортопироксена) и хромшпинелида из руд месторождения Алмаз-Жемчужина. Для ультрамафитов получены статистические диаграммы кристаллографической ориентировки оливина и ортопироксена, свидетельствующие о формировании минеральной ассоциации в условиях высокотемпературного субсолидусного пластического течения в верхней мантии. Основными механизмами являлись трансляционное скольжение и синтектоническая рекристаллизация. Деформация оливина происходила преимущественно по системам (010)[100] и (001)[100]. В текстурно-структурных особенностях хромититов запечатлены процессы пластического течения, наиболее выраженные в линзовидно-полосчатых рудах. Микроструктурные карты в кодировке обратных полюсных фигур показывают различия в гранулометрическом составе руд: участки, состоящие из вкрапленных хромититов, характеризуются более мелкозернистой структурой по сравнению с линзовидными обособлениями массивного строения. Анализ микроструктурных карт показывает, что при переходе от вкрапленных к массивным рудам отмечается широкое развитие рекристаллизационных процессов, приспособление соседних зерен друг к другу, результирующее к гомогенизации кристаллографической ориентировки в агрегатах. Полученные данные развивают представления о реоморфической природе хромититовых сегрегаций в офиолитовых дунитах. Предполагается, что укрупнение структуры массивных хромититов критически связано с увеличением концентрации рудных зерен в ходе твердофазной сегрегации внутри пластического потока, когда отдельные зерна хромшпинелида, изначально разделенные силикатным материалом, начинают приходить в непосредственный контакт друг с другом.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>Microstructural features of the main rock-forming minerals of host ultramafic rocks (olivine, orthopyroxene) and chrome spinel from ores of the Almaz-Zhemchuzhina deposit were studied using the electron backscatter diffraction method. For ultramafic rocks, statistical diagrams of the crystallographic orientation of olivine and orthopyroxene were obtained, indicating the formation of a mineral association in conditions of high-temperature subsolidus plastic flow in the upper mantle. The main mechanisms were translation gliding and syntectonic recrystallization. Olivine deformation occurred predominantly along the (010)[100] and (001)[100] systems. The textural and structural features of chromitites reflect plastic flow processes, most pronounced in lenticular-banded ores. Microstructure maps in inverse pole figure encoding show differences in the grain size composition of the ores: areas consisting of disseminated chromitites are characterized by a finer-grained structure compared to lens-shaped segregations of a massive structure. Analysis of microstructure maps shows that during the transition from disseminated to massive ores, there is a widespread development of recrystallization, adaptation of neighbouring grains to each other, resulting in homogenization of crystallographic orientation in aggregates. The data obtained develop ideas about the rheomorphic nature of chromitite segregations in ophiolite dunites. It is assumed that the coarsening of the structure of massive chromitites is critically associated with an increase in the concentration of ore grains during solid-phase segregation within a plastic flow, when individual chrome spinel grains, initially separated by silicate material, begin to come into direct contact with each other.</p>
      </abstract>
      <kwd-group xml:lang="ru">
        <title>Ключевые слова</title>
        <kwd>офиолиты</kwd>
        <kwd>хромититы</kwd>
        <kwd>оливин</kwd>
        <kwd>пластическая деформация</kwd>
        <kwd>EBSD</kwd>
        <kwd>Кемпирсай</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <title>Keywords</title>
        <kwd>ophiolites</kwd>
        <kwd>chromitites</kwd>
        <kwd>olivine</kwd>
        <kwd>plastic deformation</kwd>
        <kwd>EBSD</kwd>
        <kwd>Kempirsai</kwd>
      </kwd-group>
      <funding-group>
        <funding-statement xml:lang="ru">Работа выполнена за счет гранта Российского научного фонда № 22-17-00019. Исследования проведены в ЦКП «Структурные и физико-механические исследования материалов» (ИПСМ РАН).</funding-statement>
        <funding-statement xml:lang="en">The work was supported by the Russian Science Foundation grant N 22-17-00019. The research was carried out at the Collaborative Access Centre “Structural, Physical, and Mechanical Research of Materials” (IPSM RAS).</funding-statement>
      </funding-group>
    </article-meta>
  </front>
  <body/>
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