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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">geology</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Геология и разведка</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of higher educational establishments. Geology and Exploration</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0016-7762</issn><issn pub-type="epub">2618-8708</issn><publisher><publisher-name>Sergo Ordzhonikidze Russian State University for Geological Prospecting</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32454/0016-7762-2026-68-1-8-18</article-id><article-id custom-type="edn" pub-id-type="custom">MMAOBR</article-id><article-id custom-type="elpub" pub-id-type="custom">geology-1283</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>ГЕОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>GEOLOGY</subject></subj-group></article-categories><title-group><article-title>Минералого-генетические особенности тяжелой фракции россыпи р. Малая Нестеровка (Приморский край) по данным микрозондового анализа</article-title><trans-title-group xml:lang="en"><trans-title>Mineralogy and geochemistry of heavy concentrate from the Malaya Nesterovka gold placer (Primorsky krai): electron microprobe data</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1791-2017</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Медведев</surname><given-names>Е. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Medvedev</surname><given-names>E. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Медведев Евгений Иванович — научный сотрудник</p><p>159, пр-т 100-летия Владивостока, Владивосток 690022</p></bio><bio xml:lang="en"><p>Evgenii I. Medvedev — Researcher</p><p>159, 100-years Vladivostok ave., 690022, Vladivostok, 690022</p></bio><email xlink:type="simple">Cage21@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7673-0099</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ивин</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Ivin</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ивин Виталий Викторович — кандидат геолого- минералогических наук, заведующий лаборато рией нел инейной металлогении</p><p>159, пр-т 100-летия Владивостока, Владивосток 690022</p></bio><bio xml:lang="en"><p>Vitaliy V. Ivin — Cand. Sci. (Geol.-Mineral.), Head of the Laboratory, Laboratory of Nonlinear Metallogeny</p><p>159, 100-years Vladivostok ave., 690022, Vladivostok, 690022</p></bio><email xlink:type="simple">ivin_vv@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГБУН «Дальневосточный геологический институт» Дальневосточного отделения Российской академии наук</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Far East Geological Institute Far East Branch 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>01</day><month>06</month><year>2026</year></pub-date><volume>68</volume><issue>1</issue><fpage>8</fpage><lpage>18</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Медведев Е.И., Ивин В.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Медведев Е.И., Ивин В.В.</copyright-holder><copyright-holder xml:lang="en">Medvedev E.I., Ivin V.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.geology-mgri.ru/jour/article/view/1283">https://www.geology-mgri.ru/jour/article/view/1283</self-uri><abstract><sec><title>Введение</title><p>Введение. Фадеевский рудно-россыпной узел (Приморский край) является перспективной золотоносной площадью, однако коренные источники многочисленных россыпей узла до настоящего времени остаются дискуссионными. Впервые для россыпи реки Малая Нестеровка, локализованной в пределах этого узла, проведено комплексное микрозондовое исследование вещественного состава самородного золота и его минералов-с путников в тяжелой фракции россыпи.</p></sec><sec><title>Цель</title><p>Цель. Минералого-геохимическое изучение самородного золота и его минералов- спутников в магнитной, электромагнитной и тяжелой фракциях россыпи р. М. Нестеровка с применением микрозондового анализа и сканирующей электронной микроскопии для реконструкции возможных типов коренных источников питания и последующих постседиментационных процессов, происходящих в россыпной системе.</p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Исследование выполнено на пробах шлихового материала. Первичный минералогический контроль проводился под бинокулярными микроскопами МБС-10 и Nikon SMZ 465. Для детального микрохимического анализа методом SEM-EDS были отобраны индивидуальные зерна золота, сульфидов и других минералов- спутников. Анализы выполнены в ЦКП ДВГИ ДВО РАН на микрорентгеноспектральном анализаторе Jeol JXA-8100 (Япония) и сканирующем электронном микроскопе Carl Zeiss EVO 50 XVP (Германия) с энергодисперсионным спектрометром INCA Energy 350.</p></sec><sec><title>Результаты</title><p>Результаты. Выявлен комплексный полимиктовый состав, включающий четыре геохимических типа самородного золота: высокопробное, уран-рубидиевое, ртутьсодержащее и золото с органоминеральными пленками. В шлихах идентифицированы платиноидные минералы (сперрилит), высокохромистые шпинелиды (Cr# = 0,95–0,99), ферробадделеит, сульфиды (борнит, пирротин) и гипергенные Cr-Mn-Si образования. Доказано, что поверхность золотин подвержена сорбции органического вещества и глинистых минералов с формированием органоминеральных пленок, содержащих до 14,5 мас.% C и 12,7 мас.% O.</p></sec><sec><title>Заключение</title><p>Заключение. На основании парагенетического анализа предложена модель разнотипного источника питания россыпи, включающего: 1) ультрамафит-мафитовый массив (источник сперрилита, хромита и бадделеита); 2) среднетемпературную золото-кварцевую минерализацию; 3) низкотемпературную золото- ртутную минерализацию; 4) специализированную золото-уран-редкометалльную минерализацию. Сохранность химически неустойчивых сульфидов свидетельствует о близости коренных источников. Разработаны минералого-геохимические критерии прогнозирования скрытого оруденения в пределах Фадеевского рудного узла.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. The Fadeevsky ore-placer cluster (Primorsky Krai) is a promising gold-bearing area; however, the bedrock sources of its numerous placers remain a subject of debate. For the first time, a comprehensive microprobe study of the composition of native gold and its associated heavy fraction minerals has been conducted on the Malaya Nesterovka River placer, located within this cluster.</p></sec><sec><title>Aim</title><p>Aim. To perform a mineralogical and geochemical study of native gold and accessory minerals in the magnetic, electromagnetic, and heavy fractions of the Malaya Nesterovka placer using microprobe analysis and scanning electron microscopy for reconstructing potential types of primary source rocks and assessing subsequent post-sedimentary (supergene) processes within the placer system.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. Samples of natural concentrates were studied. Preliminary mineralogical inspection was carried out using MBS-10 and Nikon SMZ 465 binocular microscopes. For a detailed microchemical research, individual grains of gold and accessory minerals were selected and analyzed by scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS). The analyses were performed at the Center for Collective Use of the Far East Geological Institute FEB RAS using a Jeol JXA-8100 electron probe microanalyzer (Japan) and a Carl Zeiss EVO 50 XVP scanning electron microscope (Germany) equipped with an INCA Energy 350 spectrometer.</p></sec><sec><title>Results</title><p>Results. The concentrates were found to have a complex polymictic composition. Four geochemical types of native gold were identified: high-fineness, uranium-rubidium-bearing, mercury-bearing,  and carbonaceous/organomineral-coated gold. Heavy mineral concentrates yielded platinum- group minerals (sperrylite), high-chromium spinels (Cr# = 0.95–0.99), ferrian baddeleyite, sulfides (bornite, pyrrhotite), and supergene Cr-M n-Si formations. The surface of gold particles was established to be susceptible to sorption of organic matter and clay minerals forming organomineral films containing up to 14.5 and 12.7 wt % of C and O, respectively.</p></sec><sec><title>Conclusion</title><p>Conclusion. As a result of the paragenetic analysis, a heterogeneous/diverse model of placer source rocks was proposed, including: (1) ultramafic-mafic massif (source of sperrylite, chromite, and baddeleyite); (2) mesothermal gold-quartz formation; (3) low-temperature gold-mercury mineralization; and (4) specialized gold-uranium-rare metal mineralization. The preservation of chemically unstable sulfides indicates the proximity of primary source rocks. Mineralogical and geochemical criteria for predicting concealed mineralization within the Fadeevsky Ore Cluster were developed.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>россыпь золота</kwd><kwd>Малая Нестеровка</kwd><kwd>Приморский край</kwd><kwd>микрозондовый анализ</kwd><kwd>самородное золото</kwd><kwd>геохимические типы</kwd><kwd>сперрилит</kwd><kwd>бадделеит</kwd><kwd>источники питания</kwd><kwd>гипергенез</kwd></kwd-group><kwd-group xml:lang="en"><kwd>gold placer</kwd><kwd>Malaya Nesterovka</kwd><kwd>Primorsky Krai</kwd><kwd>microprobe analysis</kwd><kwd>native gold</kwd><kwd>geochemical types</kwd><kwd>sperrylite</kwd><kwd>baddeleyite</kwd><kwd>source rocks</kwd><kwd>supergene processes</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">исследования проведены по теме госзадания ДВГИ ДВО РАН № 125033104605–6</funding-statement><funding-statement xml:lang="en">research was carried out on the subject of the State Assignment of the FEGI FEB RAS № 125033104605–6.</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">Медведев Е.И., Молчанов В.П. 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