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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">geores</journal-id><journal-title-group><journal-title xml:lang="ru">Георесурсы</journal-title><trans-title-group xml:lang="en"><trans-title>Georesources</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1608-5043</issn><issn pub-type="epub">1608-5078</issn><publisher><publisher-name>Georesursy LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18599/grs.2026.1.8</article-id><article-id custom-type="elpub" pub-id-type="custom">geores-443</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>RESEARCH ARTICLES</subject></subj-group></article-categories><title-group><article-title>Редкоземельные фторкарбонаты в углеродсодержащих сланцах Ишлинского грабена (западный склон Южного Урала)</article-title><trans-title-group xml:lang="en"><trans-title>Rare Earth Fluorocarbonates in Carbonaceous Shales of the Ishlya Graben (Western Slope of the Southern Urals)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6753-7484</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ковалев</surname><given-names>С. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Kovalev</surname><given-names>S. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергей Григорьевич Ковалев – доктор геол.-минерал. наук, директор</p><p>450077, Уфа, ул. Карла Маркса, 16/2</p></bio><bio xml:lang="en"><p>Sergey G. Kovalev – Dr. Sci. (Geology and Mineralogy), Director</p><p>16/2 Karl Marx St., Ufa, 450077</p></bio><email xlink:type="simple">kovalev@ufaras.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>Ковалев</surname><given-names>С. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Kovalev</surname><given-names>S. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергей Сергеевич Ковалев – старший научный сотрудник, кандидат геол.-минерал. наук</p><p>450077, Уфа, ул. Карла Маркса, 16/2</p></bio><bio xml:lang="en"><p>Sergey S. Kovalev – Senior Researcher, Cand. Sci. (Geology and Mineralogy)</p><p>16/2 Karl Marx St., Ufa, 450077</p></bio><email xlink:type="simple">sgkv1984@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт геологии УФИЦ РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Geology of the Ufa Federal Research Centre of the Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>27</day><month>03</month><year>2026</year></pub-date><volume>28</volume><issue>1</issue><fpage>138</fpage><lpage>148</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ковалев С.Г., Ковалев С.С., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Ковалев С.Г., Ковалев С.С.</copyright-holder><copyright-holder xml:lang="en">Kovalev S.G., Kovalev S.S.</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.geors.ru/jour/article/view/443">https://www.geors.ru/jour/article/view/443</self-uri><abstract><p>Целью данной работы является характеристика фторкарбонатов редкоземельных элементов, впервые обнаруженных в углеродсодержащих сланцах Ишлинского грабена расположенного на западном склоне Южного Урала.</p><p>Рифтогенные образования представлены переслаиванием терригенных пород (углеродсодержащие сланцы, алевросланцы, алевролиты) с вулкано-плутонической ассоциацией (габбродолериты, эффузивы основного состава с небольшим количеством пирокластического материала). Все породы метаморфизованы в условиях эпидот-амфиболитовой фации (Т = ~ 390–490 °С, Р = ~ 2,5–10 кбар). В углеродсодержащих сланцах были обнаружены бастнезит-(Ce), гидроксилбастнезит-(Се), паризит-(Ce) и синхизит-(Ce), морфологически представленные единичными ксеноморфными выделениями, прожилками различной морфологии, микрозернистыми массами в зальбандах карбонатных и кварц-карбонатных прожилков, агрегатами, выполняющими пустоты в кристаллах пирита и сферолитами, сложенными длиннопризматическими, игольчатыми кристаллами.</p><p>Показано, что генезис редкоземельных фторкарбонатов обусловлен гидротермальным метаморфизмом при изменении химического состава флюида: первичные включения – СaCl2 + NaCl, вторичные включения – FeCl2. При этом одним из источников СО2 явилось окисление органики углеродсодержащих сланцев, а Са2+ – альбитизация плагиоклаза в метаморфизованных магматических породах.</p><p>На основе анализа индикаторных отношений редкоземельных элементов во фторкарбонатах из различных регионов мира установлено, что при их формировании большое значение имеет химический состав среды минералообразования и масштабность процессов перераспределения вещества (в случае их локальности следует ожидать большего разнообразия в химическом составе образующихся редкоземельных фторкарбонатов).</p></abstract><trans-abstract xml:lang="en"><p>The aim of this work is to characterize rare earth fluorocarbonates, first discovered in carbonaceous shales of the Ishlya graben, and to develop an acceptable genetic model of their formation.</p><p>Riftogenic formations are represented by interbedding of terrigenous rocks (carbonaceous shales, siltstones, siltstones) with a volcano-plutonic association (gabbrodolerites, basic effusives with a small amount of pyroclastic material). All rocks are metamorphosed under epidote-amphibolite facies conditions (T = ~ 390–490 °C, P = ~ 2.5–10 kbar).</p><p>Bastnaesite-(Ce), hydroxylbastnaesite-(Ce), parisite-(Ce) and synchysite-(Ce) were found in carbonaceous shales, morphologically represented by single xenomorphic segregations, veinlets of various morphologies, microgranular masses in selvages of carbonate and quartz-carbonate veinlets, aggregates filling voids in pyrite crystals and spherulites composed of long-prismatic, needle-shaped crystals. It is shown that the genesis of rare-earth fluorocarbonates is caused by hydrothermal metamorphism with a change in the chemical composition of the fluid (CaCl2 + NaCl → FeCl2). In this case, the source of CO2 was the oxidation of organic matter in carbonaceous shales, and Ca2+ was the albitization of plagioclase. Based on the analysis of indicator ratios of rare earth elements in fluorocarbonates from different regions of the world, it has been established that the chemistry of the mineral formation environment and the scale of the substance redistribution processes are of great importance during their formation (in the case of their locality, greater diversity in the chemical composition of the resulting rare earth fluorocarbonates should be expected).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Южный Урал</kwd><kwd>редкоземельные фторкарбонаты</kwd><kwd>углеродсодержащие сланцы</kwd><kwd>гидротермальный метаморфизм</kwd><kwd>флюидные включения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Southern Urals</kwd><kwd>rare earth fluorocarbonates</kwd><kwd>carbonaceous shales</kwd><kwd>hydrothermal metamorphism</kwd><kwd>fluid inclusions</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках Государственного задания (тема № FMRS-2025-0015). 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