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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">gtcrust</journal-id><journal-title-group><journal-title xml:lang="ru">Геодинамика и тектонофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Geodynamics &amp; Tectonophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2078-502X</issn><publisher><publisher-name>Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.5800/GT-2022-13-3-0613</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1529</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ПАЛЕОГЕОДИНАМИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PALEOGEODYNAMICS</subject></subj-group></article-categories><title-group><article-title>ДВА ЭТАПА КАЙНОЗОЙСКОГО ЩЕЛОЧНО-БАЗАЛЬТОВОГО ВУЛКАНИЗМА ДАРХАТСКОЙ ВПАДИНЫ (СЕВЕРНАЯ МОНГОЛИЯ) – ГЕОХРОНОЛОГИЯ, ГЕОХИМИЯ И ГЕОДИНАМИЧЕСКИЕ СЛЕДСТВИЯ</article-title><trans-title-group xml:lang="en"><trans-title>TWO STAGES OF THE CENOZOIC ALKALINE-BASALT VOLCANISM IN THE DARKHAD DEPRESSION (NORTHERN MONGOLIA) – GEOCHRONOLOGY, GEOCHEMISTRY, AND GEODYNAMIC CONSEQUENCES</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Цыпукова</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Tsypukova</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Фаворского, 1а, Россия </p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033, Russia </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Перепелов</surname><given-names>А. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Perepelov</surname><given-names>A. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Фаворского, 1а, Россия </p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033, Russia </p></bio><email xlink:type="simple">alper@igc.irk.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Демонтерова</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Demonterova</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Лермонтова, 128, Россия </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033, Russia</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Иванов</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Ivanov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Лермонтова, 128, Россия </p></bio><bio xml:lang="en"><p>128 Lermontov St, Irkutsk 664033, Russia</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дриль</surname><given-names>С. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Dril</surname><given-names>S. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Фаворского, 1а, Россия </p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033, Russia </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кузьмин</surname><given-names>М. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuzmin</surname><given-names>M. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Фаворского, 1а, Россия </p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033, Russia </p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Травин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Travin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>630090, Новосибирск, пр-т Академика Коптюга, 3, Россия</p></bio><bio xml:lang="en"><p>3 Academician Koptyug Ave, Novosibirsk 630090, Russia</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Щербаков</surname><given-names>Ю. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Shcherbakov</surname><given-names>Yu. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p> 664033, Иркутск, ул. Фаворского, 1а, Россия </p></bio><bio xml:lang="en"><p>1а Favorsky St, Irkutsk 664033, Russia</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пузанков</surname><given-names>М. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Puzankov</surname><given-names>M. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>683006, Петропавловск-Камчатский, б-р Пийпа, 9, Россия</p></bio><bio xml:lang="en"><p>9 Piip Blvd, PetropavlovskKamchatsky 683006, Russia</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Канакин</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kanakin</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия, Россия</p></bio><bio xml:lang="en"><p>6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia, Russia</p></bio><xref ref-type="aff" rid="aff-5"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геохимии им. А.П. Виноградова СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт земной коры СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Институт геологии и минералогии им. В.С. Соболева СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Институт вулканологии и сейсмологии ДВО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Volcanology and Seismology, Far Eastern Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-5"><aff xml:lang="ru"><institution>Геологический институт им. Н.Л. Добрецова СО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>19</day><month>09</month><year>2022</year></pub-date><volume>13</volume><issue>3</issue><fpage>613</fpage><lpage>613</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Цыпукова С.С., Перепелов А.Б., Демонтерова Е.И., Иванов А.В., Дриль С.И., Кузьмин М.И., Травин А.В., Щербаков Ю.Д., Пузанков М.Ю., Канакин С.В., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Цыпукова С.С., Перепелов А.Б., Демонтерова Е.И., Иванов А.В., Дриль С.И., Кузьмин М.И., Травин А.В., Щербаков Ю.Д., Пузанков М.Ю., Канакин С.В.</copyright-holder><copyright-holder xml:lang="en">Tsypukova S.S., Perepelov A.B., Demonterova E.I., Ivanov A.V., Dril S.I., Kuzmin M.I., Travin A.V., Shcherbakov Y.D., Puzankov M.Y., Kanakin S.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gt-crust.ru/jour/article/view/1529">https://www.gt-crust.ru/jour/article/view/1529</self-uri><abstract><p>На основе данных изотопного датирования в кайнозойской истории вулканической активности Дархатской впадины Северной Монголии выделены два этапа – инициальный позднеолигоценовый этап (~28.0–26.6 млн лет) и заключительный позднемиоцен-раннеплиоценовый этап (~5.8–4.2 млн лет). Установлено, что породы раннего инициального этапа представлены исключительно трахиандезибазальтами, а среди базальтоидов заключительного этапа выделяется гавайит-базанит-фонотефритовая серия пород щитовых вулканических построек и комплекс трахибазальтов «долинных» лавовых толщ, формирование которых завершает вулканическое развитие территории. Показано, что для трахиандезибазальтов инициального этапа характерными являются их относительное обогащение TiO2, P2O5, Sr, Zn, Ga и низкие концентрации Al2O3, MnO, CaO, Sc и HREE (La/Yb=27.2–30.2). Базальтоиды заключительного этапа демонстрируют рост содержаний TiO2, Al2O3, P2O5, LILE, HFSE, Th, U и увеличение степени фракционирования REE (La/Yb от 12.2 до 20.9) в направлении увеличения щелочности пород. Моделирование процессов плавления эклогитов, пироксенитов и перидотитов в системе La/Yb – Sm/Yb показывает, что трахиандезибазальтовые расплавы могли быть сформированы при ~7–8%-ном плавлении эклогитового вещества или ~10–11%-ном – Grt-содержащих пироксенитов, а трахибазальтовые расплавы образуются при ~2–3%-ном плавлении Grt-содержащих перидотитов. Распределение составов пород в координатах Mg# – Fe/Mn указывает на то, что к исходным магмам относятся трахиандезибазальты инициального этапа и раннеплиоценовые трахибазальты «долинных» лавовых толщ. Изотопные характеристики Sr, Nd и Pb базальтоидов Дархатской впадины демонстрируют значимое смещение значений изотопных отношений во времени в направлении от относительно обогащенной мантии к деплетированной мантии MORB типа. Формирование трахиандезибазальтовых расплавов на инициальном этапе происходило в позднем олигоцене на предрифтовой стадии развития территории с вовлечением в область магмообразования вещества метасоматизированной мантии с участием пироксенитового или эклогитового компонента. Происхождение позднемиоцен-раннеплиоценовых щелочно-базальтовых магм заключительного этапа связано с процессами декомпрессионного плавления перидотитов слабометасоматизированной литосферной мантии на рифтогенной стадии развития Дархатской структуры.</p></abstract><trans-abstract xml:lang="en"><p>The isotopic data showed that there are two stages distinguished in the Cenozoic history of the Darkhad depression volcanic activity, the Late Oligocene initial stage (~28.0–26.6 Ma) and the final Late Miocene – Early Pliocene stage (~5.8–4.2 Ma). It has been stated that the rocks of the initial stage are only represented by trachybasalts; however, among the final-stage basaltoids there are series of shield-volcano hawaite-basanite-phonotephrite rocks and compex trachybasaltic "valley" lava flows, the formation of which is the last stage in the territorial volcanic evolution. It has been shown that the initial-stage trachybasaltic andesites are characterized by their enrichment of TiO2, P2O5, Sr, Zn, Ga and low concentrations of Al2O3, MnO, CaO, Sc and HREE (La/Yb=27.2–30.2). Basaltoids of the final stage have a similar rare-element distribution and show an increase in the contents of TiO2, Al2O3, P2O5, LILE, HFSE, Th, U and in the degree of fractionation of REE (La/Yb from 12.2 to 20.9) towards the rocks alkalinity enhancement. Modeling of eclogite, pyroxenite and peridotite melting processes in the La/Yb – Sm/Yb system shows that trachybasaltic andesite melts could be formed at ~7–8 % melting of eclogitic matter or at ~10–11 % melting of Grt-containing pyroxenites, with trachybasalt formed at ~3 % melting of Grt-containing peridotites. The composition distribution of rocks in coordinates (Mg# – Fe/Mn) indicates that the parental magmas are the initial-stage trachybasaltic andesite magmas as well as the Early Pliocene trachybasaltic "valley" lava flows. Sr, Nd, Pb isotope characteristics of the Darkhad depression basaltoids show significant shift of isotopic ratios in time towards the relatively enriched mantle as compared with the depleted MORB mantle. The initial formation of trachybasaltic andesite melts occurred in the Late Oligicene at the pre-rift stage of the territory development involving metasomatized mantle matter, with the pyroxenite or eclogite component contained in the magma formation source. The origin of trachybasalt magmas of the final stage is associated with the processes of decompression melting of peridotites in a weakly metasomatized lithospheric mantle at the rift stage of the Darkhad structure development.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>кайнозойский вулканизм</kwd><kwd>Дархатская впадина</kwd><kwd>Северная Монголия</kwd><kwd>геохронология</kwd><kwd>минералогия</kwd><kwd>геохимия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Cenozoic volcanism</kwd><kwd>Darkhad depression</kwd><kwd>Northern Mongolia</kwd><kwd>geochronology</kwd><kwd>mineralogy</kwd><kwd>geochemistry</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках государственного задания по теме НИР № 0284-2021-0007 и гранта РФФИ № 20-05-00116 Института геохимии им. А.П. Виноградова СО РАН, а также по теме государственного задания Института геологии и минералогии им. В.С. Соболева СО РАН. В работе задействовалось оборудование ЦКП «Геодинамика и геохронология» Института земной коры СО РАН (грант № 075-15-2021-682).</funding-statement><funding-statement xml:lang="en">The research was carried out within the state assignment (0284-2021-0007), and RFBR (grant 20-05-00116) of IGC SB RAS, and the state assignment of Sobolev Institute of Geology and Mineralogy SB RAS. This work involved the equipment of the "Geodynamics and Geochronology" Shared Research Facilities of the Institute of the Earth's Crust SB RAS (grant 075-15-2021-682).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Carlson R.W., Ionov D.A., 2019. Compositional Characteristics of the MORB Mantle and Bulk Silicate Earth Based on Spinel Peridotites from the Tariat Region, Mongolia. 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