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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">10.24930/1681-9004-2020-20-3-305-327</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-1293</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>Граница нижнего и среднего карбона в разрезах восточного склона Южного и Среднего Урала: изотопный состав углерода и кислорода в известняках</article-title><trans-title-group xml:lang="en"><trans-title>The Mid-Carboniferous boundary in the eastern slope of the Southern and Middle Urals: carbon and oxygen isotopic composition in limestones</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>Дуб</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dub</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620016, Russia</p></bio><email xlink:type="simple">sapurin@igg.uran.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>Мизенс</surname><given-names>Г. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Mizens</surname><given-names>G. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620016, 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>Кулешов</surname><given-names>В. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Kuleshov</surname><given-names>V. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119017, Москва, Пыжевский пер., 7</p></bio><bio xml:lang="en"><p>7 Pyzhevskii lane, Moscow 119017, 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>Степанова</surname><given-names>Т. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Stepanova</surname><given-names>T. I.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620016, 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>Кучева</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kucheva</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620016, 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>Николаева</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikolaeva</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>117647, Москва, Профсоюзная ул., 123</p><p>420008, Казань, Кремлевская ул., 18 </p></bio><bio xml:lang="en"><p>123 Profsoyuznaya st., Moscow 117647, Russia </p><p>19 Kremlevskaya st., Kazan 420008, Russia</p><p> </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>Мельничук</surname><given-names>О. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Melnichuk</surname><given-names>O. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>15 Akad. Vonsovsky st., Ekaterinburg 620016, 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>Кулагина</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kulagina</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петров</surname><given-names>О. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>O. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119017, Москва, Пыжевский пер., 7</p></bio><bio xml:lang="en"><p>7 Pyzhevskii lane, Moscow 119017, Russia</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии и геохимии им. УрО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>A.N. Zavaritsky Institute of Geology and Geochemistry ural Branch of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Геологический институт РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Geological Institute of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Natural history Museum,&#13;
Палеонтологический институт РАН, &#13;
Казанский (Приволжский) федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Natural history Museum, London,&#13;
Borissiak Paleontological Institute RAS,&#13;
Kazan Federal university,</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Институт геологии Уфимского федерального исследовательского центра РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology uFRC 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>05</day><month>07</month><year>2020</year></pub-date><volume>20</volume><issue>3</issue><fpage>305</fpage><lpage>327</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дуб С.А., Мизенс Г.А., Кулешов В.Н., Степанова Т.И., Кучева Н.А., Николаева С.В., Мельничук О.Ю., Кулагина Е.И., Петров О.Л., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Дуб С.А., Мизенс Г.А., Кулешов В.Н., Степанова Т.И., Кучева Н.А., Николаева С.В., Мельничук О.Ю., Кулагина Е.И., Петров О.Л.</copyright-holder><copyright-holder xml:lang="en">Dub S.A., Mizens G.A., Kuleshov V.N., Stepanova T.I., Kucheva N.A., Nikolaeva S.V., Melnichuk O.Y., Kulagina E.I., Petrov O.L.</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/1293">https://www.lithosphere.ru/jour/article/view/1293</self-uri><abstract><p>Объектами исследования являлись известняки пограничного нижне-среднекаменноугольного интервала на восточном склоне Урала (разрезы “Худолаз”, “Худолаз-лог” и “Большой Кизил” на Южном Урале, “Исетский карьер” и “Луговая” – на Среднем). </p><sec><title>Методика</title><p>Методика. Проанализирован изотопный состав углерода и кислорода валовых проб известняков. </p></sec><sec><title>Результаты</title><p>Результаты. Получены первые результаты изучения изотопного состава углерода и кислорода карбонатных отложений серпуховско-башкирского интервала в разрезах восточного склона Южного и Среднего Урала. Показано, что величина δ13C в наиболее полных разрезах колеблется в пределах от 1.5 до 3.8‰, а δ18O – от 23.1 до 30.7‰.</p></sec><sec><title>Выводы</title><p>Выводы. Вариации изотопного состава углерода и кислорода в целом обусловлены как глобальными, так и местными событиями. В Восточно-Уральских бассейнах (северная периферия Палеотетиса) тренд к утяжелению изотопного состава углерода в карбонатных осадках проявился уже в позднесерпуховское время. В ряде случаев с этим трендом ассоциирует и положительный экскурс величины δ18O, который, вероятнее всего, связан с  глобальным кратковременным похолоданием (оледенением).</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Research subject</title><p>Research subject. Limestones of the Mid-Carboniferous boundary interval of the Urals eastern slope (“Khudo-laz”, “Khudolaz-gully” and “Bolshoy Kizil” sections at the Southern Urals, as well as “Iset quarry” and “Lugovaya” sections in the Middle Urals) are considered. </p></sec><sec><title>Methods</title><p>Methods. Carbon and oxygen isotopic composition in bulk samples was analyzed.</p></sec><sec><title>Results</title><p>Results. The carbon and oxygen isotopic composition in carbonate deposits of the Serpukhovian-Bashkirian boundary interval in the sections of the Southern and Middle Urals eastern slope was studied. It is shown that the value of δ13C in the most complete sections varies from 1.5 to 3.8‰, while δ18O – from 23.1 to 30.7‰. </p></sec><sec><title>Conclusions</title><p>Conclusions. Variations in the carbon and oxygen isotopic composition are associated with both global and local events. In the East Uralian basins (northern periphery of Paleotethys), the shift in carbon isotopic composition of carbonate sediments appeared in the Late Serpukhovian. In some cases, this trend correlates with the positive excursion of δ18O, which is most likely associated with the global short-term cooling (glaciation). </p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>восточный склон Урала</kwd><kwd>нижний и средний карбон</kwd><kwd>граница С1-С2</kwd><kwd>биостратиграфия</kwd><kwd>изотопы углерода и кислорода</kwd><kwd>перерыв в осадконакоплении</kwd></kwd-group><kwd-group xml:lang="en"><kwd>eastern slope of the urals</kwd><kwd>the Lower and Middle Carboniferous sub-systems</kwd><kwd>the Mid-Carboniferous boundary</kwd><kwd>biostratigraphy</kwd><kwd>carbon and oxygen isotopes</kwd><kwd>unconformity (hiatus)</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают глубокую признательность М.Т. Крупенину и Д.В. Гражданкину за продуктивное обсуждение тонкостей геохимии стабильных изотопов, а также В.В. 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