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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">10.24930/1681-9004-2022-22-2-179-199</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-1583</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>Диагенез обломочных руд Ишкининского кобальт-медноколчеданного месторождения (Южный Урал): минералого-геохимические данные и термодинамическое моделирование</article-title><trans-title-group xml:lang="en"><trans-title>Diagenesis of clastic ores of the Ishkininо Co-bearing massive sulfide deposit (Southern Urals): Mineralogical-geochemical data  and thermodynamic modeling</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>Мелекесцева</surname><given-names>И. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Melekestseva</surname><given-names>I. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>456317, Челябинская обл., г. Миасс</p></bio><bio xml:lang="en"><p>Miass town, Chelyabinsk region 456317</p></bio><email xlink:type="simple">melekestseva-irina@yandex.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>Масленников</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Maslennikov</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>456317, Челябинская обл., г. Миасс</p></bio><bio xml:lang="en"><p>Miass town, Chelyabinsk region 456317</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>Третьяков</surname><given-names>Г. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Tret’yakov</surname><given-names>G. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>456317, Челябинская обл., г. Миасс</p></bio><bio xml:lang="en"><p>Miass town, Chelyabinsk region 456317</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Южно-Уральский федеральный научный центр минералогии и геоэкологии УрО РАН, Институт минералогии</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Mineralogy SU FRC MG UB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>28</day><month>04</month><year>2022</year></pub-date><volume>22</volume><issue>2</issue><fpage>179</fpage><lpage>199</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мелекесцева И.Ю., Масленников В.В., Третьяков Г.А., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Мелекесцева И.Ю., Масленников В.В., Третьяков Г.А.</copyright-holder><copyright-holder xml:lang="en">Melekestseva I.Y., Maslennikov V.V., Tret’yakov G.A.</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/1583">https://www.lithosphere.ru/jour/article/view/1583</self-uri><abstract><sec><title>Объект исследования</title><p>Объект исследования. Преобразованные обломочные руды Ишкининского кобальт-медноколчеданного месторождения, залегающего в серпентинитах Главного Уральского разлома.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Исследованы текстуры и структуры руд, методом LA ICP MS определены содержания элементов-примесей в сульфидах и оксидах, в программе Selektor проведено физико-химическое моделирование диагенетического образования акцессорных арсенидов.</p></sec><sec><title>Результаты</title><p>Результаты. Обломочные руды представлены преобразованными гравелитами, содержащими угловатые и округлые обломки серпентинитов, сульфидов и хромита в псаммитовом матриксе такого же минерального состава. Гидротермальные минералы в обломках не сохранились; они замещены кристаллическим пиритом-2, пористым пиритом-3, ксеноморфным пиритом-4, пирротином, халькопиритом, магнетитом. Халькопирит и магнетит замещают все сульфиды, сульфоарсениды, хромит, а также нерудные минералы. Хромит присутствует в серпентинитовых обломках и представлен отдельными обломками кристаллов. В матриксе наблюдаются идиоморфные кристаллы кобальтина с включениями никелина, герсдорфита и самородного золота. Кристаллический пирит-2 характеризуется повышенными содержаниями Mn, Co, Ni, Cu и Zn. Пористый пирит-3 содержит повышенные концентрации Co, Cu и Se. Ксеноморфный пирит-4 обогащен большинством элементов-примесей по сравнению с другими сульфидами и другими генерациями пирита. Халькопирит характеризуется повышенными содержаниями Zn и Se. Пирротин содержит самые высокие концентрации Ni (1770 г/т) и повышенные – Co (407 г/т).</p></sec><sec><title>Выводы</title><p>Выводы. Главные элементыпримеси руд месторождения (Co и Ni), а также Cu, Zn и Mn присутствуют не только в сульфидах, но и в оксидах: хромит содержит Zn и Ni, а магнетит – Mn и Cu. Селен содержится в сопоставимых количествах во всех сульфидах. Теллур главным образом концентрируется в пирите-4. По сравнению с другими колчеданными месторождениями серпентинит-сульфидные гравелиты Ишкининского месторождения были преобразованы не выше стадии диагенеза. Диагенетическое преобразование обломочных руд привело к формированию аутигенных кобальтина, герсдорфита, никелина и самородного золота в результате высвобождения элементов-примесей из первичных гидротермальных сульфидов, что отразилось на общем низком уровне содержаний элементов-примесей в позднедиагенетических минералах. Термодинамическое моделирование показало возможность образования As-содержащих фаз (в частности, никелина) при температурах до 200°C и ниже.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Research subject</title><p>Research subject. The transformed clastic ores (ore diagenites) of the Ishkinino Co-bearing massive sulfide deposit hosted by serpentinites of the Main Uralian Fault Zone.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The structures and textures of the ores were stu died. The trace element contents of sulfides and oxides were determined using LA ICP MS. The physical and chemical modeling of the diagenetic formation of accessory As minerals was conducted using the Selektor program package. </p></sec><sec><title>Results</title><p>Results. The clastic ores are transformed gravelites with angular and rounded clasts of serpentinites, sulfides and chromite in the psammitic matrix of the same mineral composition. No hydrothermal minerals remain in gravelites; they are replaced by crystalline pyrite-2, porous pyrite-3, anhedral pyrite-4, pyrrhotite, chalcopyrite and magnetite. Chalcopyrite and magnetite replace all sulfides, sulfarsenides, chromite and gangue minerals. Chromite occurs as fragmented crystals or inclusions into serpentinite clasts. The matrix hosts euhedral cobaltite crystals with nickeline, gersdorffite and native gold inclusions. Crystalline pyrite-2 is characterized by higher Mn, Co, Ni, Cu and Zn contents. Porous pyrite-3 exhibits higher Co, Cu and Se contents. Anhedral pyrite-4 is enriched in most trace element contents in comparison with other sulfides and pyrite generations. Chalcopyrite is characterized by higher contents of Zn and Se. Pyrrhotite contains the highest Ni and hi gher Co contents.</p></sec><sec><title>Conclusions</title><p>Conclusions. The main trace elements in the ores of the deposit (Co and Ni), as well as Cu, Zn and Mn, are hosted not only in sulfides, but also in oxides. Thus, chromite contains Zn and Ni, while magnetite contains Mn and Cu. Selenium occurs in all sulfides in similar quantities. Tellurium is mostly concentrated in pyrite-4. A comparative analysis of our results with those reported on other massive sulfide deposits showed that the serpentinite-sulfide gravelites of the Ishkinino deposit had been intensely transformed during diagenesis, which resulted in low trace element contents in diagenetic sulfides. The diagenetic alteration of clastic ores led to the formation of authigenic cobaltite, gersdorffite, nickeline and native gold as a result of trace element release from primary hydrothermal minerals. Thermodynamic mode ling showed the possibility of formation of As-bearing minerals (in particular, nickeline) at temperatures of 200°C and below.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>сульфиды</kwd><kwd>пирит</kwd><kwd>пирротин</kwd><kwd>халькопирит</kwd><kwd>оксиды</kwd><kwd>магнетит</kwd><kwd>хромит</kwd><kwd>элементы-примеси</kwd><kwd>физико-химическое моделирование</kwd><kwd>Ишкининское месторождение</kwd><kwd>Главный Уральский разлом</kwd><kwd>Южный Урал</kwd></kwd-group><kwd-group xml:lang="en"><kwd>sulfides</kwd><kwd>pyrite</kwd><kwd>pyrrhotite</kwd><kwd>chalcopyrite</kwd><kwd>oxides</kwd><kwd>magnetite</kwd><kwd>chromite</kwd><kwd>trace elements</kwd><kwd>physical and chemical mode ling</kwd><kwd>Ishkinino deposit</kwd><kwd>Main Uralian fault</kwd><kwd>South Urals</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследования выполнены в рамках государственной бюджетной темы № АААА-А18-118060890054-0</funding-statement><funding-statement xml:lang="en">This work was supported by the state contract No. АААА-А18-118060890054-0</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">Аюпова Н.Р., Масленников В.В., Артемьев Д.А., Блинов И.А. 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