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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Доклады Академии наук</journal-id><journal-title-group><journal-title xml:lang="en">Доклады Академии наук</journal-title><trans-title-group xml:lang="ru"><trans-title>Доклады Академии наук</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0869-5652</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">18596</article-id><article-id pub-id-type="doi">10.31857/S0869-56524893286-291</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Geochemistry</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Геохимия</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Olivine in a coesite-bearing eclogite from the Udachnaya kimberlite pipe</article-title><trans-title-group xml:lang="ru"><trans-title>Оливин в коэситовом эклогите из кимберлитовой трубки “Удачная”</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Mikhailenko</surname><given-names>D. S.</given-names></name><name xml:lang="ru"><surname>Михайленко</surname><given-names>Д. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>pazilovdenis@igm.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rezvukhin</surname><given-names>D. I.</given-names></name><name xml:lang="ru"><surname>Резвухин</surname><given-names>Д. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>pazilovdenis@igm.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Korsakov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Корсаков</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>pazilovdenis@igm.nsc.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sobolev</surname><given-names>N. V.</given-names></name><name xml:lang="ru"><surname>Соболев</surname><given-names>Н. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Academician of the Russian Academy of Sciences</p></bio><bio xml:lang="ru"><p>Академик РАН</p></bio><email>pazilovdenis@igm.nsc.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт геологии и минералогии имени В.С. Соболева Сибирского отделения Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Novosibirsk State University</institution></aff><aff><institution xml:lang="ru">Новосибирский национальный исследовательский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2019-11-29" publication-format="electronic"><day>29</day><month>11</month><year>2019</year></pub-date><volume>489</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>286</fpage><lpage>291</lpage><history><date date-type="received" iso-8601-date="2019-12-09"><day>09</day><month>12</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-12-09"><day>09</day><month>12</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Russian academy of sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Российская академия наук</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Russian academy of sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0869-5652/article/view/18596">https://journals.eco-vector.com/0869-5652/article/view/18596</self-uri><abstract xml:lang="en"><p>Olivine (high-Fe forsterite; Fo# 69-76) and associated minerals have been studied in a coesite-bearing diamon-diferous eclogite from the Udachnaya-East kimberlite pipe. Olivine was identified in the rock interstices together with K‑feldspar, sodalite, phlogopite and djerfisherite. The composition of individual olivine grains varies within the xenolith and is characterized by a consistent presence of P2O5, MnO, CaO и Al2O3. The coexistence of olivine and coesite is uncommon for mantle xenoliths. The occurrence of olivine and K, Na, Сl-bearing minerals in the studied sample is suggested to have been caused by the interaction of the eclogite with a protokimberlitic melt enriched in alkali components and chlorine.</p></abstract><trans-abstract xml:lang="ru"><p>Проведено исследование оливина (высокожелезистого форстерита; Fo# 69-76) и ассоциирующих минералов в коэситсодержащем алмазоносном эклогите из кимберлитовой трубки “Удачная Восточная”. Оливин обнаружен в интерстициях совместно с калиевым полевым шпатом, содалитом, флогопитом и джерфишеритом. Состав отдельных зёрен оливина изменяется в пределах ксенолита и характеризуется постоянным присутствием таких примесей, как P<sub>2</sub>O<sub>5</sub>, MnO, CaO и Al<sub>2</sub>O<sub>3</sub>. Для мантийных ксенолитов ассоциация оливина и коэсита нехарактерна. Присутствие оливина и K, Na, Сl-содержащих минералов в изученном образце может являться следствием взаимодействия эклогита с протокимберлитовым расплавом, богатым щелочными компонентами и хлором.</p></trans-abstract><kwd-group xml:lang="en"><kwd>olivine</kwd><kwd>coesite</kwd><kwd>diamond</kwd><kwd>kimberlite</kwd><kwd>metasomatism</kwd><kwd>eclogite</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>оливин</kwd><kwd>коэсит</kwd><kwd>алмаз</kwd><kwd>кимберлиты</kwd><kwd>метасоматоз</kwd><kwd>эклогиты</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was carried out as part of state assignment of the IGM SB RAS and with financial support from the RFBR projects 18-35-00219, 18-05-00643A, 18-3520072.</funding-statement><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания ИГМ СО РАН и при финансовой поддержке проектов РФФИ 18-35-00219, 18-05-00643А, 18-3520072.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Sobolev N.V., Logvinova A.M., Zedgenizov D.A., et al. 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