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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">Geochemistry International</journal-id><journal-title-group><journal-title xml:lang="en">Geochemistry International</journal-title><trans-title-group xml:lang="ru"><trans-title>Геохимия</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-7525</issn><issn publication-format="electronic">3034-4956</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">700441</article-id><article-id pub-id-type="doi">10.7868/S3034495625120014</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</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">CROZET RISE, INDIAN OCEAN: PETROLOGY, GEOCHEMISTRY AND GEODYNAMIC FEATURES OF FORMATION</article-title><trans-title-group xml:lang="ru"><trans-title>ПОДВОДНОЕ ПОДНЯТИЕ КРОЗЕ, ИНДИЙСКИЙ ОКЕАН: ПЕТРОЛОГИЯ, ГЕОХИМИЯ И ГЕОДИНАМИЧЕСКИЕ ОСОБЕННОСТИ ФОРМИРОВАНИЯ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Sushchevskaya</surname><given-names>N. M</given-names></name><name xml:lang="ru"><surname>Сущевская</surname><given-names>Н. М</given-names></name></name-alternatives><email>nadyas@geokhi.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shcherbakov</surname><given-names>V. D</given-names></name><name xml:lang="ru"><surname>Щербаков</surname><given-names>В. Д</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Dubinin</surname><given-names>E. P</given-names></name><name xml:lang="ru"><surname>Дубинин</surname><given-names>Е. П</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Shishkina</surname><given-names>T. A</given-names></name><name xml:lang="ru"><surname>Шишкина</surname><given-names>Т. А</given-names></name></name-alternatives><email>tshishkina@geokhi.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Belyatsky</surname><given-names>B. V</given-names></name><name xml:lang="ru"><surname>Беляцкий</surname><given-names>Б. В</given-names></name></name-alternatives><email>bbelyatsky@mail.ru</email><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lorenz</surname><given-names>K. A</given-names></name><name xml:lang="ru"><surname>Лоренц</surname><given-names>К. А</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Anosova</surname><given-names>M. O</given-names></name><name xml:lang="ru"><surname>Аносова</surname><given-names>М. О</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Bolshiyanov</surname><given-names>D. Yu</given-names></name><name xml:lang="ru"><surname>Большиянов</surname><given-names>Д. Ю</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff5"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт геохимии и аналитической химии им. В.И. Вернадского РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Geological Faculty, Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова, Геологический факультет</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Museum of Natural History, Moscow State University</institution></aff><aff><institution xml:lang="ru">Московский государственный университет имени М.В. Ломоносова, Музей землеведения</institution></aff></aff-alternatives><aff-alternatives id="aff4"><aff><institution xml:lang="en">Karpinsky Russian Geological Research Institute</institution></aff><aff><institution xml:lang="ru">Всероссийский научно-исследовательский геологический институт им. А.П. Карпинского</institution></aff></aff-alternatives><aff-alternatives id="aff5"><aff><institution xml:lang="en">Arctic and Antarctic Research Institute</institution></aff><aff><institution xml:lang="ru">Арктический и антарктический институт (ААНИИ)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2025</year></pub-date><volume>70</volume><issue>12</issue><issue-title xml:lang="en">VOL 70, NO12 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 70, №12 (2025)</issue-title><fpage>943</fpage><lpage>965</lpage><history><date date-type="received" iso-8601-date="2026-01-08"><day>08</day><month>01</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-15"/></permissions><self-uri xlink:href="https://journals.eco-vector.com/0016-7525/article/view/700441">https://journals.eco-vector.com/0016-7525/article/view/700441</self-uri><abstract xml:lang="en"><p>One of the widely discussed issues of oceanic rise formation is the possibility of their formation by the interaction of hot spots and mid-ocean ridges. The Crozet Rise (less than 9 million years old) is located in the western Indian Ocean and consists of a group of volcanic islands with alkaline lavas. The paper studies basanites of the largest island of the archipelago, Possession Island. As a result of the conducted petrological and geochemical studies, the use of geophysical data and calculation models, the conditions of the formation of the lavas of Possession Island were determined, as well as the relationship between the features of the origin of the Crozet Rise and other rises of the western Indian Ocean located near southern Africa. The olivine-clinopyroxene-spinel phenocryst association observed in the lavas of Possession Island corresponds to deeper crystallization conditions compared to typical oceanic magmas, for which the olivine-plagioclase-clinopyroxene association is common. Fractionation of melts could have occurred in the intermediate chamber as a result of the intrusion of different portions of magma at pressures of 8–10 kbar and temperatures of 1200–1300 °C during the formation of the volcanic edifice 9 million years ago. The geochemical characteristics of the Possession Island lavas, including the isotopic composition of Sr, Nd, and Pb, indicate an enriched source, possibly with an admixture of a HIMU-type component (with high primary U/Pb and U/Th ratios), and are close to the composition of enriched magmas of the Indian Ocean uplifts – Crozet, Marion, and Bouvet, but differ from the composition of basalts of the Conrad, Afanasy Nikitin, and Mozambique Ridge uplifts located in the western part of the Indian Ocean. The enriched HIMU-type source is associated mainly with the substance of the ancient continental Gondwana mantle. The melting process may have involved fragments of continental crust or oceanic mantle enriched during the early stages of evolution, since the Crozet Rise is an intraplate structure recently formed under the influence of a hotspot on relatively ancient oceanic lithosphere. In this case, fractionation of alkaline magmas occurred at a depth of ~25–30 km. The formation of the eastern part of the Crozet Rise occurred under the influence of the Crozet-Marion hot spot, which can be considered a satellite of a large African plume, which significantly influenced the entire history of the development of the Southern Ocean.</p></abstract><trans-abstract xml:lang="ru"><p>Одним из широко обсуждаемых вопросов формирования океанических поднятий является возможность их образования при взаимодействии горячих точек и срединно-океанических хребтов. Поднятие Крозе (возраст менее 9 млн лет) расположено в западной части Индийского океана и состоит из группы вулканических островов с лавами щелочного состава. В работе изучены базаниты самого крупного острова архипелага – о. Поссесьон. В результате проведенных петролого-геохимических исследований, использования геофизических данных и расчетных моделей были определены условия формирования лав о. Поссесьон, а также взаимосвязь особенностей происхождения поднятия Крозе и других поднятий западной части Индийского океана, расположенных вблизи Южной Африки. Наблюдаемая в лавах о. Поссесьон ассоциация вкрапленников оливин-клинопироксен-шпинель соответствует более глубинным условиям кристаллизации в сравнении с типичными океаническими магмами, для которых распространенной является ассоциация оливин-плагиоклаз-клинопироксен. Фракционирование расплавов могло происходить в промежуточном очаге в результате внедрения разных порций магмы при давлениях 8−10 кбар и температурах 1200−1300°С при формировании вулканической постройки 9 млн лет назад. Геохимические характеристики лав о. Поссесьон, включая изотопный состав Sr, Nd, и Pb, указывают на обогащенный источник, возможно, с примесью компонента типа HIMU (с высокими первичными отношениями U/Pb и U/Th), и близки составу обогащенных магм поднятий Индийского океана – Крозе, Марион и Буве, но отличаются от состава базальтов поднятий Конрад, Афанасия Никитина и Мозамбикского хребта, расположенных в западной части Индийского океана. Обогащенный источник типа HIMU связан главным образом с веществом древней континентальной Гондавиской мантии. В процесс плавления могли быть вовлечены фрагменты континентальной коры или океанической мантии, обогащенной на ранних этапах эволюции, поскольку поднятие Крозе является внутриплитной структурой, недавно сформированной под воздействием горячей точки на относительно древней океанической литосфере. При этом фракционирование щелочных магм происходило на глубине ~25–30 км. Образование восточной части поднятия Крозе происходило под влиянием горячей точки Крозе–Марион, которую можно рассматривать как сателлитную крупного Африканского плюма, существенно повлиявшего на всю историю развития Южного океана.</p></trans-abstract><kwd-group xml:lang="en"><kwd>hot spot</kwd><kwd>mid-ocean ridge</kwd><kwd>geochemistry of magmatism</kwd><kwd>isotopic composition</kwd><kwd>clinopyroxene</kwd><kwd>crystallization conditions</kwd><kwd>Indian Ocean</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>горячая точка</kwd><kwd>срединно-океанический хребет</kwd><kwd>геохимия магматизма</kwd><kwd>изотопный состав</kwd><kwd>клинопироксен</kwd><kwd>условия кристаллизации</kwd><kwd>Индийский океан</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Института геохимии и аналитической химии им. В.И. 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