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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">10.24930/1681-9004-2022-22-6-709-740</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-1755</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>Геохимические особенности вулканитов северной части Тагильской структуры как отражение эволюции палеозоны субдукции</article-title><trans-title-group xml:lang="en"><trans-title>Geochemical features of volcanites of the northern part of the Tagil structure as a reflection of the evolution of the paleozone of subduction</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. Акад. Вонсовского, 15,</p></bio><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620110</p></bio><email xlink:type="simple">Georg_Petrov@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт геологии и геохимии УрО РАН<country>Россия</country></aff><aff xml:lang="en">A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2023</year></pub-date><volume>22</volume><issue>6</issue><fpage>709</fpage><lpage>740</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Петров Г.А., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Петров Г.А.</copyright-holder><copyright-holder xml:lang="en">Petrov G.A.</copyright-holder><license 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/1755">https://www.lithosphere.ru/jour/article/view/1755</self-uri><abstract><sec><title>Объект исследования</title><p>Объект исследования. Вулканогенные образования северной части Тагильской мегазоны.</p></sec><sec><title>Материал и методы</title><p>Материал и методы. Исследовались вулканиты Тагильской палеоостроводужной системы и ее обрамления, включая базальты и андезибазальты следующих свит: хомасьинской O1-2, шемурской O3-S1, павдинской S1, именновской S1-2, туринской S2-D1, перевозской D1, краснотурьинской D1, лимкинской D2-3, а также долериты ивдельского комплекса D3. Выполнены силикатные (РФА) анализы и определение редких элементов методом ICP-MS, проведена обработка и интерпретация этих данных с использованием дискриминационных и спайдер-диаграмм, а также индикаторных геохимических параметров.</p></sec><sec><title>Результаты</title><p>Результаты. Выяснено, что геохимические параметры, отражающие степень деплетированности вмещающих пород магматических очагов, а также влияние флюидов, выделяющихся при дегидратации пород погружающихся пластин, достаточно определенно демонстрируют увеличение роли субдуцированного материала в составе островодужных магм и позволяют определить время начала субдукционного процесса, резкого изменения режима функционирования и завершения последнего.</p></sec><sec><title>Выводы</title><p>Выводы. Полученные геохимические данные подтверждают представления о начале процесса субдукции в конце среднего–начале верхнего ордовика, перестройку (перескок?) зоны субдукции в нижнем девоне и завершение процесса в верхнем девоне.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Research subject</title><p>Research subject. Volcanogenic formations of the northern part of the Tagil megazone.</p></sec><sec><title>Material and methods</title><p>Material and methods. Volcanites of the Tagil paleo-island arc system and its frames were studied, including basalts and andesibasalts of the following formations: Khomas’inskaya O1-2, Shemurskaya O3-S1, Pavdinskaya S1, Imennovskaya S1-2, Turinskaya S2-D1, Perevozskaya D1, Krasnotur’inskaya D1, Limkinskaya D2-3, as well as dolerites of the Ivdel complex D3. Silicate (XFA) analyses and determination of rare elements by ICP-MS method were performed. The obtained data was analyzed using discrimination and spider diagrams, as well as indicator geochemical parameters.</p></sec><sec><title>Results</title><p>Results. The geochemical parameters reflecting the degree of depletion of the host rocks of magmatic chambers, as well as the influence of fluids released during the dehydration of rocks of subducted slabs, quite definitely demonstrate an increase in the role of subducted material in the composition of island-arc magmas. This allows the onset of the subduction process, sharp changes in the conditions of its functioning and the time of its completion to be determined.</p></sec><sec><title>Conclusions</title><p>Conclusions. The obtained geochemical data confirms the existing concepts about the onset of the subduction process at the end of the Middle – beginning of the Upper Ordovician, restructuring (jumping?) of the subduction zone in the Lower Devonian and completion in the Upper Devonian.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>Северный Урал</kwd><kwd>Тагильская мегазона</kwd><kwd>вулканиты</kwd><kwd>геохимия</kwd><kwd>субдукция</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Northern Urals</kwd><kwd>Tagil megazone</kwd><kwd>volcanites</kwd><kwd>geochemistry</kwd><kwd>subduction</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Исследования выполнены в рамках государственного задания ИГГ УрО РАН, тема № АААА-А18-118053090044-1, с использованием оборудования ЦКП “Геоаналитик” ИГГ УрО РАН. Дооснащение и комплексное развитие ЦКП “Геоаналитик” осуществляются при финансовой поддержке гранта Министерства науки и высшего образования Российской Федерации, соглашение № 075-15-2021-680</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The studies was carried out as a part of the IGG UB RAS state assignment (No. АААА-А18-118053090044-1) using the “Geoanalitik” shared research facilities of the IGG UB RAS. The re-equipment and comprehensive development of “Geoanalitik” is financially supported by the grant of 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">Анцыгин Н.Я., Шурыгина М.В., Наседкина В.А. (1988) Новые данные по стратиграфии палеозоя Северного Урала. Геологическое развитие Урала: достижения и проблемы. 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