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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">litosphere</journal-id><journal-title-group><journal-title xml:lang="ru">Литосфера</journal-title><trans-title-group xml:lang="en"><trans-title>LITHOSPHERE (Russia)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1681-9004</issn><issn pub-type="epub">2500-302X</issn><publisher><publisher-name>A.N. Zavaritsky Institute of Geology and Geochemistry</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24930/2500-302X-2026-26-3-584-607</article-id><article-id custom-type="edn" pub-id-type="custom">CQWPUU</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-2529</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>Статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Неоархейский габбро-анортозитовый магматизм: изотопно-геохимические и геохронологические исследования Цагинского и Ачинского массивов Кейвской структуры (Кольский регион)</article-title><trans-title-group xml:lang="en"><trans-title>Neoarchean gabbro–anorthosite magmatism: Isotope-geochemical and geochronological studies of the Tsaginsky and Achinsky massifs of the Keivy structure (Kola region)</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>Кудряшов</surname><given-names>Н. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Kudryashov</surname><given-names>N. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>184209; ул. Ферсмана, 14; Апатиты</p></bio><bio xml:lang="en"><p>Nikolay M. Kudryashov</p><p>184209; 14 Fersman st.; Apatity</p></bio><email xlink:type="simple">n.kudryashov@ksc.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>Мокрушин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Mokrushin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>184209; ул. Ферсмана, 14; Апатиты</p></bio><bio xml:lang="en"><p>Artem V. Mokrushin</p><p>184209; 14 Fersman st.; Apatity</p></bio><email xlink:type="simple">a.mokrushin@ksc.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>Удоратина</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Udoratina</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>167982; ул. Первомайская, 54; Сыктывкар</p></bio><bio xml:lang="en"><p>Oksana V. Udoratina</p><p>167982; 54 Pervomaiskaya st.; Syktyvkar</p></bio><email xlink:type="simple">udoratina@geo.komisc.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Геологический институт ФИЦ КНЦ РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Geological Institute, FRC KSC RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт геологии им. академика Н.П. Юшкина ФИЦ Коми НЦ УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>N.P. Yushkin Institute of Geology, FRC Komi SC UB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>19</day><month>07</month><year>2026</year></pub-date><volume>26</volume><issue>3</issue><fpage>584</fpage><lpage>607</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кудряшов Н.М., Мокрушин А.В., Удоратина О.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Кудряшов Н.М., Мокрушин А.В., Удоратина О.В.</copyright-holder><copyright-holder xml:lang="en">Kudryashov N.M., Mokrushin A.V., Udoratina O.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.lithosphere.ru/jour/article/view/2529">https://www.lithosphere.ru/jour/article/view/2529</self-uri><abstract><sec><title>   Объекты исследования</title><p>   Объекты исследования. Цагинский и Ачинский габбро-анортозитовые массивы Кейвской структуры Кольского региона.</p></sec><sec><title>   Цель</title><p>   Цель. Характеристика эволюции неоархейского габбро-анортозитового магматизма на основе новых изотопно-геохимических и геохронологических данных.</p></sec><sec><title>   Методы</title><p>   Методы. Датирование циркона U-Pb (ID TIMS и SHRIMP-RG), Sm-Nd (по валовой породе) определение изотопных характеристик, геохимического состава пород, исследования внутреннего строения циркона в обратно рассеянных электронах и катодолюминесценции, определение содержаний РЗЭ в цирконе.</p></sec><sec><title>   Результаты</title><p>   Результаты. Установлено, что время кристаллизации циркона из габбро-анортозитов и габбро-норитов Цагинского массива составляет 2672 ± 10 и 2667 ± 2 млн лет, соответственно. Для субщелочных гранитов, прорывающих габбро-анортозиты Цагинского массива, по магматическому циркону определено время кристаллизации – 2671 ± 2 млн лет. Возраст кристаллизации циркона из габбро-анортозитов Ачинского массива составил 2675 ± 10 млн лет. Sm-Nd изотопные данные для габбро-анортозитов Цагинского и Ачинского массивов свидетельствуют о формировании первичных расплавов из обогащенного мантийного источника с εNd = +0.1 … +3.1. Sm-Nd изотопные значения для субщелочных гранитов Кейвской структуры с εNd = +0.2 … +1.9 также имеют мантийные характеристики без заметной добавки корового материала.</p></sec><sec><title>   Выводы</title><p>   Выводы. Неоархейские габбро-анортозиты, субщелочные и щелочные граниты Кейвской структуры образованы в относительно короткий промежуток времени – 2.75–2.67 млрд лет – за счет плавления метасоматизированной мантии, поднятия плюма в обстановке растяжения на постколлизионных этапах развития структуры и дифференциацией магматического расплава от основного до щелочно-гранитного составов с аккумуляцией плагиоклаза на начальных стадиях. Значительное преобладание продуктов кислого магматизма над продуктами основного магматизма в Кейвской структуре, вероятно, определяется уровнем современного эрозионного среза. Изученные габбро-анортозитовые массивы, приуроченные к региональным разломам в краевых частях Кейвской структуры, вероятно, являются частью значительных объемов базитов, находящихся на глубине.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>   Research subject</title><p>   Research subject. The Tsaginsky and Achinsky gabbro–anorthosite massifs of the Keivy structure (Kola region).</p></sec><sec><title>   Aim</title><p>   Aim. To develop a model of the Archean anorthosite magnetism formation based on new isotopic geochemical and geochronological characteristics.</p></sec><sec><title>   Methods</title><p>   Methods. U–Pb dating of zircon (ID TIMS and SHRIMP-RG), Sm–Nd (whole-rock) determination of isotopic characteristics, determination of the geochemical composition of rocks, study of the zircon internal structure in back-scattered electrons and cathode luminescence, determination of REE contents in zircon.</p></sec><sec><title>   Results</title><p>   Results. Zircon from the gabbro–anorthosites and gabbronorite of the Tsaginsky massif crystallized at 2672 ± 10 and 2667 ± 2 Ma, correspondingly. For subalkaline granites cutting through the gabbro–anorthosites of the Tsaginsky massif, the analysis of magmatic zircon established the crystallization age of 2671 ± 2 Ma. The crystallization age of zircon from the gabbro–anorthosites of the Achinsky massif was estimated to be 2675 ± 10 Ma. The Sm–Nd isotopic data for the gabbro–anorthosites of the Tsaginsky and Achinsky massifs indicate that the parental melts were formed from a mantle source with εNd from +0.1 to +3.1. The Sm–Nd isotopic values for alkaline and subalkaline granites of the Keivy structure with εNd from +0.2 to +1.9 also showed mantle characteristics without significant addition of crustal material.</p></sec><sec><title>   Conclusions</title><p>   Conclusions. The Neoarchean gabbro–anorthosites, subalkaline, and alkaline granites of the Keivy structure were formed over a relatively short time interval (2.75–2.67 Ga) as a result of partial melting of a metasomatized mantle source, plume-related uplift in an extensional setting during the post-collisional evolution of the structure, and subsequent differentiation of magmatic melts from basaltic to alkali-granitic compositions, with early-stage plagioclase accumulation. The apparent predominance of felsic over mafic magmatic products within the Keivy structure is likely related to the present erosional level. The studied gabbro–anorthosite massifs, associated with regional faults in the marginal parts of the Keivy structure, may represent only the upper parts of larger, deeper-seated basaltic bodies.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>габбро-анортозиты</kwd><kwd>щелочные граниты</kwd><kwd>U-Pb (ID TIMS</kwd><kwd>ShRIMP-RG)</kwd><kwd>Sm-Nd</kwd><kwd>циркон</kwd><kwd>архей</kwd><kwd>Кейвская структура</kwd><kwd>Фенноскандинавский щит</kwd></kwd-group><kwd-group xml:lang="en"><kwd>gabbro–anorthosites</kwd><kwd>alkaline granites</kwd><kwd>U–Pb (ID TIMS</kwd><kwd>ShRIMP-RG)</kwd><kwd>Sm–Nd</kwd><kwd>zircon</kwd><kwd>Archean</kwd><kwd>Keivy structure</kwd><kwd>Fennoscandian shield</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках государственного задания ГИ ФИЦ КНЦ РАН, темы FMEZ-2024-0004</funding-statement><funding-statement xml:lang="en">The research was carried out within the framework of the State assignment of the Geological Institute of FIC Kola of the Russian Academy of Sciences, topic FMEZ-2024-0004</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">Батиева И.Д. 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