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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-2025-25-3-485-505</article-id><article-id custom-type="edn" pub-id-type="custom">ELJTND</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-2308</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>Высокобарический метаморфизм в зоне Главного Уральского разлома в бассейне р. Северная Сосьва (Северный Урал)</article-title><trans-title-group xml:lang="en"><trans-title>High-pressure metamorphism in the area of the Main Ural fault in the Severnaya Sosva River basin (Northern Urals)</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>Петров</surname><given-names>Г. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>G. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>620110, г. Екатеринбург, ул. Академика Вонсовского, 15</p></bio><bio xml:lang="en"><p>15 Academician Vonsovsky st., Ekaterinburg 620110</p></bio><email xlink:type="simple">Georg_Petrov@mail.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>Балтыбаев</surname><given-names>Ш. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Baltybaev</surname><given-names>Sh. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>199034, г. Санкт-Петербург, наб. Макарова, 2</p></bio><bio xml:lang="en"><p>2 Makarova emb., St. Petersburg 199034</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>Козлов</surname><given-names>П. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozlov</surname><given-names>P. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>620110, г. Екатеринбург, ул. Академика Вонсовского, 15</p></bio><bio xml:lang="en"><p>15 Academician Vonsovsky st., Ekaterinburg 620110</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>Тристан</surname><given-names>Н. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Tristan</surname><given-names>N. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>620014, г. Екатеринбург, ул. Вайнера, 55а</p></bio><bio xml:lang="en"><p>55a Vainer st., Ekaterinburg 620014</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии и геохимии им. академика А.Н. Заварицкого УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт геологии и геохронологии докембрия РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology and Geochronology of the Precambrian, RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>АО “Уральская геолого-съемочная экспедиция”</institution><country>Россия</country></aff><aff xml:lang="en"><institution>JSC Ural geological survey expedition</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>15</day><month>07</month><year>2025</year></pub-date><volume>25</volume><issue>3</issue><fpage>485</fpage><lpage>505</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Петров Г.А., Балтыбаев Ш.К., Козлов П.С., Тристан Н.И., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Петров Г.А., Балтыбаев Ш.К., Козлов П.С., Тристан Н.И.</copyright-holder><copyright-holder xml:lang="en">Petrov G.A., Baltybaev S.K., Kozlov P.S., Tristan N.I.</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/2308">https://www.lithosphere.ru/jour/article/view/2308</self-uri><abstract><sec><title>Объект исследования</title><p>Объект исследования. Исследовались метаморфические породы хомасьинской свиты нижнего-среднего ордовика на Северном Урале (бассейн р. Северная Сосьва) в зоне Главного Уральского разлома (ГУР).</p></sec><sec><title>Цель</title><p>Цель. Реконструкция палеообстановки формирования метаморфических пород.</p></sec><sec><title>Методы и материалы</title><p>Методы и материалы. Выполнены геохимические и петролого-минералогические исследования, а также геотермобарометрия совместно с моделированием минералообразования.</p></sec><sec><title>Результаты</title><p>Результаты. Геохимические особенности базальтов пород хомасьинской свиты указывают на обогащенный мантийный источник. Пространственная ассоциация метабазальтов с аркозовыми, кварцевыми песчаниками и алевролитами позволяет считать, что накопление толщ происходило в обстановке перехода от континентального рифтогенеза к океаническому спредингу, исследуемая структура представляет собой фрагмент раннепалеозойской пассивной вулканической континентальной окраины. На фоне повсеместного метаморфизма фации зеленых сланцев вблизи ГУР картируются зоны глаукофансодержащих пород, а в тектонических линзах наблюдаются гранатсодержащие хлорит-эпидот-амфибол-мусковит-кварц-альбитовые сланцы. Амфиболы в зоне ГУР представлены актинолитами, винчитами, барруазитами, глаукофанами и магнезиальной роговой обманкой, гранаты демонстрируют прогрессивную (прямую) зональность. Белые слюды представлены фенгитами, во внутренних зонах кристаллов граната иногда присутствуют реликты парагонита. Гранатсодержащие породы формировались при давлениях не ниже 7–8 кбар и при температуре 400–500°С.</p></sec><sec><title>Выводы</title><p>Выводы. Предполагается, что минеральный состав пород и термодинамический режим их образования отвечает геодинамическому режиму субдукции (безгранатовые глаукофановые сланцы) с последующим переходом к режиму коллизии (парагенезисы с гранатом, актинолитом и роговой обманкой), чему не противоречат результаты изотопного датирования пород и выявленные Р-Т параметры их метаморфизма.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Research subject</title><p>Research subject. Metamorphic rocks of the Khomasya formation of the Lower-Middle Ordovician in the Northern Urals (the basin of the Severnaya Sosva River) in the area of the Main Ural fault (GUR) were studied.</p></sec><sec><title>Aim</title><p>Aim. Reconstruction of the formation environment of methamorphic rocks.</p></sec><sec><title>Materials and Methods</title><p>Materials and Methods. Geochemical and petrological-mineralogical studies were performed, along with geothermobarometry coupled with mineral formation modeling.</p></sec><sec><title>Results</title><p>Results. The geochemical features of the basalts of the Khomasya formation rocks indicate an enriched mantle source. The spatial association of metabasalts with arkose, quartz sandstones, and siltstones suggests that the accumulation of strata occurred during the transition from continental rifting to oceanic spreading, and that the structure under study is a fragment of an Early Paleozoic passive volcanic continental margin. Against the background of widespread metamorphism of the facies of green shales, zones of glaucophane-containing rocks are mapped near the GUR, and garnet-containing chlorite-epidote-amphibole-muscovite-quartz-albite shales are observed in tectonic lenses. Amphiboles in the GUR area are represented by actinolites, vinchites, barroisites, glaucophanes, and magnesian hornblende; garnets demonstrate a progressive (direct) zonality. White micas are represented by phengites, and sometimes there are relics of paragonite in the inner zones of garnet crystals. Garnet-containing rocks were formed at pressures not lower than 7–8 kbar and at temperatures up to ~ 600°C.</p></sec><sec><title>Conclusions</title><p>Conclusions. It is assumed that the mineral composition of rocks and the thermodynamic regime of their formation correspond to the geodynamic regime of subduction (granite-free glaucophane shales) followed by a transition to the collision regime (paragenesis with garnet, actinolite, and hornblende), which agrees with the results of isotope dating of rocks and the revealed P-T parameters of their metamorphism.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>Северный Урал</kwd><kwd>Главный Уральский разлом</kwd><kwd>высокобарический метаморфизм</kwd><kwd>Р-Т параметры</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Northern Urals</kwd><kwd>Main Ural fault</kwd><kwd>high-pressure metamorphism</kwd><kwd>R-T parameters</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования проведены в соответствии с темами государственного задания ИГГ УрО РАН (№№ госрегистрации 123011800013-6, 123011800009-9, 1230118000143) с использованием оборудования ЦКП “Геоаналитик” ИГГ УрО РАН. Дооснащение и комплексное развитие ЦКП “Геоаналитик” ИГГ УрО РАН осуществляются при финансовой поддержке гранта Министерства науки и высшего образования Российской Федерации, соглашение № 075-15-2021-680</funding-statement><funding-statement xml:lang="en">The research was carried out in accordance with the topics of the state task of IGG Ural Branch of the Russian Academy of Sciences (state registration No. 123011800013-6, 123011800009-9, 1230118000143), using the equipment of the CCP “Geoanalytik” IGG Ural Branch of the Russian Academy of Sciences. Retrofitting and integrated development of the CCP “Geoanalytik” IGG Ural Branch of the Russian Academy of Sciences is carried out with the financial support of a grant from the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 075-15-2021-680.</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">Вализер П.М., Ленных В.И. (1988) Амфиболы голубых сланцев Урала. М.: Наука, 203 с.</mixed-citation><mixed-citation xml:lang="en">Barberi F., Ferrara G., Santacroce R., Treuil M., Varet J. (1975) A transitional basalt-pantellerite sequence of fractional crystallisation, the Boina centre (Afar rift, Ethiopia). J. Petrol., (16), 22-56.</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Вализер П.М., Краснобаев А.А., Русин А.И., Зворыгина А.А. 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