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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">Geotectonics</journal-id><journal-title-group><journal-title xml:lang="en">Geotectonics</journal-title><trans-title-group xml:lang="ru"><trans-title>Геотектоника</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0016-853X</issn><issn publication-format="electronic">3034-4972</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">15646</article-id><article-id pub-id-type="doi">10.31857/S0016-853X2019325-42</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">Tectonics of the Southern Ocean passive margins in the Africa – East Antarctica region</article-title><trans-title-group xml:lang="ru"><trans-title>Тектоника пассивных окраин южного океана в регионе Африки – Восточной Антарктиды</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Melankholina</surname><given-names>E. N.</given-names></name><name xml:lang="ru"><surname>Меланхолина</surname><given-names>Е. Н.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>e.melanh@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib><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><address><country country="RU">Russian Federation</country></address><email>e.melanh@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Geological Institute, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Геологический институт РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><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><pub-date date-type="pub" iso-8601-date="2019-08-13" publication-format="electronic"><day>13</day><month>08</month><year>2019</year></pub-date><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>25</fpage><lpage>42</lpage><history><date date-type="received" iso-8601-date="2019-08-12"><day>12</day><month>08</month><year>2019</year></date><date date-type="accepted" iso-8601-date="2019-08-12"><day>12</day><month>08</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/0016-853X/article/view/15646">https://journals.eco-vector.com/0016-853X/article/view/15646</self-uri><abstract xml:lang="en"><p>Based on geological and geophysical data for the conjugate margins of Africa – East Antarctica, the peculiarities of preparation of the breakup central Gondwana supercontinent are discussed. When using the historical approach, a significant inheritance of the Middle-Upper Jurassic tectono-magmatic development from the preceding time is shown. The first location of tectono-magmatic activity in zones of weakness on the proximal margin, its subsequent migration to distal margins and further oceanic opening is established. The geochemical features of magmas of the region and their sources are under discussion. Evidence for the decisive influence of the Karoo-Mod plume on the development of magmatism is presented. A significant feature of the plume manifestation is considered: the presence of high-magnesian ferruginous picrites , formed by melting of a pyroxenite source with specific composition, coinciding with the central part of the plume and corresponding to the earliest eruptions. We determined the source of magmatism at the initial stage could have been the substance of a rising plume, and magmas reached the surface through existing fractures without interacting with the lithosphere. In the course of evolution, the admixture of pyroxenites in the source decreased and the melts acquired the features of the melting lithospheric mantle, which was reflected in the isotopic characteristics of the melts with a predominance of the enriched EM II component. The structure and magmatism of the Southern Ocean and South Atlantic are compared. Also discussed the locations of the Mesozoic Karoo-Maud and Tristan plumes, as well as the zones of the subsequent breakup of Gondwana, above the margin of the African superplume, indicating a relationship between surface and deep-seated events, is discussed.</p></abstract><trans-abstract xml:lang="ru"><p>На основе рассмотрения геолого-геофизических данных по сопряженным окраинам Африки – Восточной Антарктиды проведено обсуждение особенностей подготовки континентального раскола в центральной части суперконтинента Гондваны. При использовании исторического подхода показана значительная унаследованность в развитии средне-позднеюрских растяжений литосферы и магматизма от предшествовавшего времени. Прослежена приуроченность тектоно-магматической активности в первую очередь к древним ослабленным зонам на проксимальной окраине, ее последующая миграция и локализация в пределах дистальных окраин, с дальнейшим океаническим раскрытием. Обсуждаются геохимические особенности магм региона и их источники. Приведены доказательства определяющего влияния плюма Кару-Мод на развитие магматизма. Рассматривается одна из важных особенностей проявления плюма – присутствие высокомагнезиальных железистых пикритов, связанных с плавлением специфического по составу пироксенитового источника, приуроченное к центральной части плюма и соответствующее наиболее ранним излияниям. Показано, что источником магматизма начального этапа могло являться вещество поднимающегося плюма, а магмы поступали на поверхность по существующим трещинам без взаимодействия с литосферой. В ходе эволюции примесь пироксенитов в источнике уменьшалась и расплавы приобретали особенности подплавляющейся литосферной мантии, что отражалось в изотопных характеристиках расплавов с преобладанием обогащенного компонента EM II. Дано сравнение структуры и магматизма на окраинах Южного океана и юга Атлантики. Обсуждается расположение мезозойских плюмов Кару-Мод и Тристан, как и зоны последующего раскола Гондваны, над краевой частью Африканского суперплюма, указывающее на связь поверхностных и глубинных событий.</p></trans-abstract><kwd-group xml:lang="en"><kwd>rifting</kwd><kwd>breakup</kwd><kwd>opening of the ocean</kwd><kwd>magmatism</kwd><kwd>magmatic source</kwd><kwd>plume</kwd><kwd>superplume</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рифтинг</kwd><kwd>раскол</kwd><kwd>раскрытие океана</kwd><kwd>магматизм</kwd><kwd>магматический источник</kwd><kwd>плюм</kwd><kwd>суперплюм</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Российский Научный Фонд</institution></institution-wrap></funding-source><award-id></award-id></award-group><award-group><funding-source><institution-wrap><institution xml:lang="en">Geological Institute, Russian Academy of Sciences</institution></institution-wrap><institution-wrap><institution xml:lang="ru">Геологический институт РАН</institution></institution-wrap></funding-source><award-id></award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Беляцкий Б.В., Прасолов Э.М., Сущевская Н.М., Михальский Е.В., Луттенен А.В. 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