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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-2020-11-2-0471</article-id><article-id custom-type="elpub" pub-id-type="custom">gtcrust-1029</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>МЕЗОПРОТЕРОЗОЙСКИЙ БАЗИТОВЫЙ МАГМАТИЗМ БАШКИРСКОГО МЕГАНТИКЛИНОРИЯ (ЮЖНЫЙ УРАЛ): ВОЗРАСТНЫЕ ОГРАНИЧЕНИЯ, ПЕТРОЛОГИЧЕСКИЕ И ГЕОХИМИЧЕСКИЕ ОСОБЕННОСТИ</article-title><trans-title-group xml:lang="en"><trans-title>MEZOPROTEROZOIC BASITE MAGMATISM OF THE BASHKIRIAN MEGANTICLINORIUM (SOUTHERN URALS): AGE CONSTRAINTS, PETROLOGICAL AND GEOCHEMICAL FEATURES</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5409-5012</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хотылев</surname><given-names>А. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Khotylev</surname><given-names>A. O.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">akhotylev@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1059-7598</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тевелев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tevelev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">atevelev@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0931-9101</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бычкова</surname><given-names>Я. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bychkova</surname><given-names>Ya. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1834-2095</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Латышев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Latyshev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">anton.latyshev@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5279-7160</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Аносова</surname><given-names>М. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Anosova</surname><given-names>M. B.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">mai.anosova@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Московский государственный университет им. М.В. Ломоносова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>M.V. Lomonosov Moscow State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Московский государственный университет им. М.В. Ломоносова; &#13;
Институт физики Земли им. О.Ю. Шмидта РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>M.V. Lomonosov Moscow State University;&#13;
Schmidt Institute of the Physics of the Earth of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>19</day><month>06</month><year>2020</year></pub-date><volume>11</volume><issue>2</issue><fpage>219</fpage><lpage>243</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Хотылев А.О., Тевелев А.В., Бычкова Я.В., Латышев А.В., Аносова М.Б., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Хотылев А.О., Тевелев А.В., Бычкова Я.В., Латышев А.В., Аносова М.Б.</copyright-holder><copyright-holder xml:lang="en">Khotylev A.O., Tevelev A.V., Bychkova Y.V., Latyshev A.V., Anosova M.B.</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/1029">https://www.gt-crust.ru/jour/article/view/1029</self-uri><abstract><p>Среди рифейско-вендских дайковых комплексов основного состава, секущих докембрийские толщи Башкирского мегантиклинория (Южный Урал), одним из самых распространенных является кургасский габбро-долеритовый раннесреднерифейский комплекс. В работе собраны и обобщены данные по изотопным датировкам, петрологическим и геохимическим особенностям пород кургасского комплекса. Впервые показано наличие региональной геохимической зональности в породах комплекса, которая выражена в уменьшении содержаний SiO2 с севера на юг вдоль Башкирского мегантиклинория и увеличении содержаний MgO в этом направлении, что авторами связывается с увеличением проницаемости коры к югу при раскрытии Машакской рифтогенной структуры.</p><p>Получены новые изотопные датировки для дайки, секущей саткинскую свиту нижнего рифея, – 1318±10 (40Ar/39Ar), тела в зоне экзоконтакта Бердяушского массива гранитов рапакиви – 1349±11 млн лет (U-Pb) и для дайки андезитов среди метаморфитов тараташского комплекса – 1365.6±6.6 млн лет (U-Pb). Эти данные, в сочетании с полученными ранее, указывают на формирование комплекса на достаточно большом протяжении времени – как минимум от 1385 до 1318 млн лет, что отвечает началу среднего рифея. Полученный возраст для дайки, секущей контактовую зону Бердяушского массива, позволяет предполагать, что к этому моменту массив уже в значительной мере кристаллизовался и вышел в условия хрупкой деформации.</p></abstract><trans-abstract xml:lang="en"><p>Among the Riphean–Vendian dyke complexes of the basic composition, which intersect the Precambrian strata of the Bashkirian meganticlinorium (Southern Urals), one of the most common is the Kurgas gabbro-dolerite complex dated to the Early – Middle Riphean. This article presents the isotopic dating, petrological and geochemical features of the rocks belonging to the Kurgas complex. It gives the first description of the regional geochemical zoning that is reflected in a decrease in SiO2 contents from the north to the south along the Bashkirian meganticlinorium, and an increase in MgO contents in the same direction, which is attributed by the authors to an increase in the permeability of the crust to the south during opening of the Mashak riftogenic structure.</p><p>New data on isotopic ages were obtained for the dyke that cuts the Satka formation of the Lower Riphean – 1318±10 (40Ar/39Ar), the intrusion in the exocontact zone of the Berdyaush rapakivi granite massif – 1349±11 Ma (U-Pb), and the andesite dyke among the metamorphic rocks of the Taratash complex – 1365.6±6.6 Ma (U-Pb). These ages, in combination with the previously obtained data, suggest that the complex formed during a rather long period of time (from 1385 to 1318 Ma, as a minimum), which corresponds to the beginning of the Middle Riphean. Isotopic U-Pb age of the dyke that cuts the contact zone of the Berdyaush massif, suggests that the major portion of the massif had already crystallized by that time and was exhumed into the shallow zone of brittle deformation.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рифей</kwd><kwd>Башкирский мегантиклинорий</kwd><kwd>Южный Урал</kwd><kwd>дайковый рой</kwd><kwd>габбро</kwd><kwd>изотопная датировка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Riphean</kwd><kwd>Bashkirian meganticlinorium</kwd><kwd>Southern Urals</kwd><kwd>dyke swarms</kwd><kwd>gabbro</kwd><kwd>isotopic dating</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования проведены при поддержке РФФИ (проект № 17-05-01121).</funding-statement><funding-statement xml:lang="en">The studies were supported by RFBR (Project 17-05-01121).</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">Alekseev A.A., 1979. 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