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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">10.24930/1681-9004-2025-25-4-725-747</article-id><article-id custom-type="edn" pub-id-type="custom">VFXEJM</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-2330</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>Специальный выпуск журнала “Литосфера”</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Special Issue of the Lithosphere Journal based on the materials reported at the 14th Ural Lithological Conference and the 5th All-Russian School of Lithology “Heterogeneity in Sedimentary Systems”</subject></subj-group></article-categories><title-group><article-title>Химический состав глинистых пород стратотипа рифея и некоторые количественные характеристики палеоклимата</article-title><trans-title-group xml:lang="en"><trans-title>Riphean stratotype mudrocks composition and some paleoclimate quantitative characteristics</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>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"><p>620110, г. Екатеринбург, ул. Академика Вонсовского, 15</p></bio><bio xml:lang="en"><p>Oleg Yu. Melnichuk</p><p>15 Academician Vonsovsky st., Ekaterinburg 620110</p></bio><email xlink:type="simple">o.u.melnichuk@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>Маслов</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Maslov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>620110, г. Екатеринбург, ул. Академика Вонсовского, 15</p></bio><bio xml:lang="en"><p>Andrey V. Maslov</p><p>15 Academician Vonsovsky st., Ekaterinburg 620110</p></bio><email xlink:type="simple">amas2004@mail.ru</email><xref ref-type="aff" rid="aff-1"/></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><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>01</day><month>09</month><year>2025</year></pub-date><volume>25</volume><issue>4</issue><issue-title>Специальный выпуск</issue-title><fpage>725</fpage><lpage>747</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мельничук О.Ю., Маслов А.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Мельничук О.Ю., Маслов А.В.</copyright-holder><copyright-holder xml:lang="en">Melnichuk O.Y., Maslov A.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/2330">https://www.lithosphere.ru/jour/article/view/2330</self-uri><abstract><p>Объектом исследования являются глинистые породы нижнего, среднего и верхнего рифея стратотипической местности – Башкирского мегантиклинория на западном склоне Южного Урала. Всего в данной работе проанализирован валовый химический состав (основные породообразующие оксиды) 154 проб глинистых сланцев, аргиллитов и глинистых алевролитов.</p><sec><title>Методика исследований</title><p>Методика исследований. С использованием ряда современных подходов проведено вычисление среднегодовых палеотемператур (СГТ) водосборов, а также суммы атмосферных осадков (СГСО) и индекса аридизации Кёппена (AIKöppen). Основой для указанных вычислений являлись значения величины CIAкорр, полученные при корректировке значений CIA с учетом положения точек составов глинистых пород стратотипа рифея на диаграмме Al2O3–(CaO* + Na2O)–K2O по реальному (не предполагаемому) тренду выветривания гранитов в умеренном климате. Кластеризация базы данных осуществлена не только по стратонам, но и с использованием величин RW-индекса.</p></sec><sec><title>Результаты</title><p>Результаты. На основании палеотемпературных характеристик водосборные площади различных эпох рифея можно рассматривать как существовавшие главным образом в умеренных либо сухих холодных климатических обстановках. Однако вычисленные нами значения СГСО и AIKöppen не представляются хоть сколько-нибудь валидными ввиду прямой корреляционной связи между величинами СГСО и СГТ, рассчитанными с помощью применяемых в настоящей статье подходов. Приведено несколько примеров вычисления СГСО с использованием величин СГТ и пограничных значений AIKöppen для позднерифейского времени.</p></sec><sec><title>Выводы</title><p>Выводы. Наиболее полезной тактикой при реконструкции количественных характеристик палеоклимата докембрийских (и, скорее всего, не только) водосборных площадей, на наш взгляд, являются вычисление палеотемператур и последующее использование минеральных индикаторов палеоклимата вместе с индексом аридизации Кёппена для расчета минимальных для гумидного климата либо максимально возможных среднегодовых сумм атмосферных осадков для сухого климата.</p></sec></abstract><trans-abstract xml:lang="en"><p>The object of research is Lower, Middle and Upper Riphean mudrocks in the stratotype area – southern Urals western slope Bashkirian megaanticlinorium. We analyzed major element oxides composition of the 154 samples selected from shales and mudstones.</p><sec><title>Research method</title><p>Research method. Mean annual temperature (MAT) and precipitation (MAP), also as Köppen aridity index (AIKöppen) was calculated by using diﬀerent modern approach for ancient catchments. Such computations became possible thanks to CIA values corrected via Al2O3–(CaO* + Na2O)–K2O diagram and granites actual (not predicted) weathering trend in humid temperate climate. In addition, we apply not only strata but RW-index value clusterization for our data base.</p></sec><sec><title>Results</title><p>Results. According to estimated paleotemperature values diﬀerent Riphean catchment areas may be considered as the they existed in humid temperate or cold arid climate. However calculated MAP and AIKöppen are more likely to be invalid through positive correlation between MAP and MAT variables. That is why we also present few examples of MAP estimation for Upper Riphean era by using AIKöppen boundary values and MAT values.</p></sec><sec><title>Conclusions</title><p>Conclusions. We think that such reconstruction tactics as paleotemperature evaluation in complex with subsequent applying of Köppen aridity index and the paleoclimate mineral proxies are the best for the quantitative paleoclimate characteristics estimation for Precambrian and, more than likely, beyond. This approach makes possible computation of the MAP lower limit for humid climates and MAP upper limit for arid climates.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>рифей</kwd><kwd>Башкирский мегантиклинорий</kwd><kwd>глинистые породы</kwd><kwd>петрогенные оксиды</kwd><kwd>палеоклимат</kwd><kwd>среднегодовая температура</kwd><kwd>среднегодовая сумма атмосферных осадков</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Riphean</kwd><kwd>Bashkirian meganticlinorium</kwd><kwd>mudrocks</kwd><kwd>major element oxides</kwd><kwd>paleoclimate</kwd><kwd>mean annual temperature</kwd><kwd>mean annul precipitation</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках темы государственного задания ИГГ УрО РАН (номер госрегистрации 123011800013-6 ). При подготовке настоящей работы использован ряд данных, любезно предоставленных авторам Э.З. Гареевым и М.Т. Крупениным. Привлечены также аналитические материалы, полученные по образцам глинистых пород, отобранным В.М. Горожаниным и С.Г. Ковалевым. Иллюстрации к статье выполнены Н.С. Глушковой. Всем перечисленным коллегам, как и анонимным рецензентам, взявшим на себя труд ознакомления с текстом и способствовавшим его улучшению, авторы искренне признательны.</funding-statement><funding-statement xml:lang="en">The research was carried out in accordance with the State Contract No. 123011800013-6 of the Institute of Geology and Geochemistry, Ural Branch of RAS. In preparing this work, a number of data were used, kindly provided to the authors by E.Z. Gareev and M.T. Krupenin. Analytical materials obtained from samples of mudrocks selected by V.M. Gorozhanin and S.G. Kovalev were also involved. Illustrations for the article were made by N.S. Glushkova. 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