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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-2025-25-5-1023-1040</article-id><article-id custom-type="edn" pub-id-type="custom">FQGZFF</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-2354</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>К вопросу о взаимосвязи αAl-индексов и отношений ряда редких и рассеянных элементов – индикаторов состава пород на палеоводосборах (на примере глинистых пород рифея и венда Южного и Среднего Урала и Шкаповско-Шиханской впадины)</article-title><trans-title-group xml:lang="en"><trans-title>On the relationship between αAl indices and the ratios of a number of trace elements – indicators of rock composition in paleo-catchments (on the example of the Riphean and Vendian clay rocks of the Southern and Middle Urals and the Shkapovo-Shikhan depression)</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>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>А. В. Маслов</p><p>620110, г. Екатеринбург, ул. Академика Вонсовского, 15</p></bio><bio xml:lang="en"><p>Andrey V. Maslov</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>04</day><month>11</month><year>2025</year></pub-date><volume>25</volume><issue>5</issue><fpage>1023</fpage><lpage>1040</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Маслов А.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Маслов А.В.</copyright-holder><copyright-holder xml:lang="en">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/2354">https://www.lithosphere.ru/jour/article/view/2354</self-uri><abstract><p>Объект исследований – глинистые породы (глинистые алевролиты, глинистые сланцы и аргиллиты) ряда стратонов рифея Башкирского мегантиклинория, а также венда Шкаповско-Шиханской впадины и Кваркушско-Каменногорского мегантиклинория. Метод исследований включал расчет по данным о валовом химическом составе глинистых пород величин αAl-индексов и анализ их корреляционных связей с отношениями (например, Th/Sc, (La/Yb)N и др.) ряда редких и рассеянных элементов – показателями состава пород на палеоводосборах. При этом любая статистически значимая корреляция величин альфа-индексов и индикаторных отношений считалась следствием контроля значений альфа-индексов со стороны состава пород палеоводосборов, и наоборот. Результаты. Установлено, что и для относительно небольших (7–8 анализов) аналитических выборок, и для средних (22 и более анализов) наблюдаются различные взаимоотношения между αAl-индексами и отношениями элементов – показателями состава комплексов пород, слагающих палеоводосборы. Выводы. Как и в случае многих других экзосферных литогеохимических индикаторов использование альфа-индексов без анализа влияния на них различных факторов не позволяет получить корректную информацию об интенсивности выветривания.</p></abstract><trans-abstract xml:lang="en"><p>Research subject. Clay rocks (clay siltstones, shales and mudstones) of a number of Riphean stratigraphic units of the Bashkir megaanticlinorium, as well as the Vendian Shkapovo-Shikhan depression and the Kvarkush-Kamennogorsk megaanticlinorium. Methods. Calculation of αAl values based on the data on the bulk chemical composition of clay rocks and the analysis of their correlation links with the ratios (e.g., Th/Sc, (La/Yb)N, etc.) of a number of trace elements that are indicators of rock composition in paleo-catchments. In this case, any statistically significant correlation between the alpha index values and the indicator ratios was considered to be a consequence of the control of the α index values by the rock composition in paleo-catchments, and vice versa. Results. For both relatively small (7–8 analyses) and medium (22 or more analyses) analytical datasets, quite different relationships were established between the αAl indices and the ratios of the elements – indicators of the composition of rocks that make up the paleo-catchments. Conclusions. Similar to many other exospheric lithogeochemical indicators, the use of α indices without analyzing the influence of various factors thereon does not provide correct information on the intensity of weathering</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рифей</kwd><kwd>венд</kwd><kwd>Южный Урал</kwd><kwd>Средний Урал</kwd><kwd>Шкаповско-Шиханская впадина</kwd><kwd>глинистые породы</kwd><kwd>αAl-индексы</kwd><kwd>геохимические индикаторы состава размывавшихся на палеоводосборах комплексов пород</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Riphean</kwd><kwd>Vendian</kwd><kwd>Southern Urals</kwd><kwd>Middle Urals</kwd><kwd>Shkapovo-Shikhan depression</kwd><kwd>clay rocks</kwd><kwd>αAlE indices</kwd><kwd>geochemical indicators of the composition of rock complexes eroded in paleo-catchments</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках темы государственного задания ИГГ УрО РАН (номер госрегистрации 123011800013-6)</funding-statement><funding-statement xml:lang="en">The research was supported by the State Contract No. 123011800013-6 of the Institute of Geology and Geochemistry, Ural Branch of RAS</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">Аблизин Б.Д., Клюжина М.Л., Курбацкая Ф.А., Курбацкий А.М. 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