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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">10.24930/1681­-9004­-2019­-19-­1­-92­-110</article-id><article-id custom-type="elpub" pub-id-type="custom">litosphere-1148</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>Минералогия, геохимия и возраст метакарбонатно-силикатных пород ильменогорского комплекса</article-title><trans-title-group xml:lang="en"><trans-title>Mineralogy, geochemistry and age of metacarbonate-silicate rocks of the Ilmenogorsky complex</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>Вализер</surname><given-names>П. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Valizer</surname><given-names>P. M.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">valizer@ilmeny.ac.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>Чередниченко</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherednichenko</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Краснобаев</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Krasnobaev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><email xlink:type="simple">krasnobaev@igg.uran.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Ильменский государственный заповедник<country>Россия</country></aff><aff xml:lang="en">Ilmen State Reserve<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Институт геологии и геохимии УрО РАН<country>Россия</country></aff><aff xml:lang="en">A.N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of RAS,<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>17</day><month>03</month><year>2019</year></pub-date><volume>0</volume><issue>1</issue><fpage>92</fpage><lpage>110</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Вализер П.М., Чередниченко С.В., Краснобаев А.А., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Вализер П.М., Чередниченко С.В., Краснобаев А.А.</copyright-holder><copyright-holder xml:lang="en">Valizer P.M., Cherednichenko S.V., Krasnobaev A.A.</copyright-holder><license 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/1148">https://www.lithosphere.ru/jour/article/view/1148</self-uri><abstract><sec><title>Объект исследования</title><p>Объект исследования. Изложены результаты минералого­петрологического, геохимического и изотопнохронологического исследования метакарбонатно­силикатных пород района оз. Бол. Ишкуль ильменогорского комплекса.</p></sec><sec><title>Методы</title><p>Методы. Микрозондовый анализ состава минералов выполнен на растровом микроскопе РЭММА­202М с микроанализатором. Содержание петрогенных, редких и редкоземельных элементов определено атомно­абсорбционным методом и на масс­спектрометре ICP­MS. U­Pb возраст цирконов получен на микрозонде SHRIMP II. Содержание РЗЭ в цирконах определено методом вторично­ионной масс­спектроскопии на ионном зонде CAMECA IMS­4F. </p></sec><sec><title>Результаты</title><p>Результаты. Тела метакарбонатно­силикатных пород неоднородны, представлены шпинель­форстерит­кальцитовой, диопсид­скаполит­кальцитовой и клинопироксенитовой разновидностями. В них установлен широкий спектр минералов: диопсид, кальцит, форстерит, шпинель, скаполит, анортит, энстатит, алюмоэнстатит, авгит, фассаит, чермакит, паргасит, роговая обманка, тремолит, барийсодержащий полевой шпат, цельзиан, флогопит, графит, титанит, фторапатит, пикроильменит, пирротин, пентландит, сфалерит, виоларит, герсдорфит, маухерит. Метакарбонатно­силикатные породы по петрогеохимическим особенностям имеют значительные вариации SiO2 – 17–52, CaO – 22–45, MgO – 5–21 мас. % при отношении Ca/Mg = 1.4–8.2, повышенные содержания Ni, Cr, низкие значения отношений Sr/Ba – ≤ 0.2–9, Th/U = 0.1–0.65, Zr/Hf = 6–31 и Nb/Ta = 3–24, La n/Ybn = 0.2–2.7, Lan/Smn = 1.2–2.5, незначительное количество РЗЭ (Σ6–25 г/т, редко до 70–72 г/т) соответствует осадочным образованиям со значительным количеством ультраосновного материала.</p></sec><sec><title>Выводы</title><p>Выводы. Особенности состава оливина, шпинели, ильменита и содержание титана в ранней генерации циркона свидетельствует об образовании­преобразовании шпинель­форстерит­кальцитовых пород при Т = 830-850°С. По особенностям распределения РЗЭ и величине Th/U: цирконы ранней генерации сопоставимы с гранулитовым типом цирконов, цирконы поздних генераций – с цирконами преобразованных сиенит­миаскитов и разнообразных метасоматитов. Образование–преобразование пород отвечает возрастным этапам: PR1 (1720-1780 млн лет) – “гранулитовый” метаморфизм; D1–C (345-399 млн лет) – метасоматические преобразования, связанные с образованием щелочных пород, сопряженных с процессами рифтогенеза; Р1 (282 млн лет) – тектоническо­метасоматические преобразования, обусловленные сдвиговыми процессами.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Research subject</title><p>Research subject. This paper presents the results of a series of mineralogical, petrological, geochemical and isotope­chronological studies carried out to investigate metacarbonate­silicate rocks in the area of Ishkul Lake, the Ilmenogorsky complex.</p></sec><sec><title>Materials and methods</title><p>Materials and methods. The microprobe analysis of the composition of minerals was performed using a REMMA­202M scanning microscope equipped with a microanalyzer. The content of major, trace and rare­earth elements (REE) was determined using a mass spectrometer ICP­MS. The U­Pb age of zircons was obtained by a microprobe SHRIMP II. The content of REE in zircons was determined by an ion probe CAMECA IMS­4F.</p></sec><sec><title>Results</title><p>Results. The studied metacarbonate­silicate rocks are shown to be represented by spinel­forsterite­calcite, diopside­scapolite­calcite and clinopyroxenite varieties with a di verse range of minerals, including diopside, calcite, forsterite, spinel, scapolite, anorthite, enstatite, alumoenstatite, augite, fassaite, tschermakite, pargasite, hornblend, tremolite, barium­containing feldspar, celsian, phlogopite, graphite, titanite, fluorapatite, picroilmenite, pyrrhotite, pentlandite, sphalerite, violarite, gersdorffite, maucherite. In terms of petrochemical properties, the metacarbonate­silicate rocks under study are characterized by significant variations in the content of SiO2, CaO, MgO at a Ca/Mg ratio of 1.4–8.2, as well as by increased Ni and Cr content, low ratios of Sr/Ba, Th/U, Zr/Hf and Nb/Ta. The small ΣREE amounts of 6–25 ppm (rarely up to 70–72 ppm) correspond to sedimentary formations with a significant amount of ultrabasic material.</p></sec><sec><title>Conclusions</title><p>Conclusions. The specific features of the composition of olivine, spinel, ilmenite, as well as the titanium content in the early generation zircon indicate the formation (transformation) of spinel­forsterite­calcite rocks at t = 830–850°C. According to the established specifics of REE distribution and the Th/U ratio, the early generation zircons refer to the granulite type zircons, while the late generation zircons correspond to those of transformed syenites­miaskites and various metasomatites. The formation (transformation) of the rocks is found to correspond to the following age stages: PR1 (1720–1780 Ma) ­ “granulite” metamorphism; D1–C (345–399 Ma) – metasomatic transformations caused by the formation of alkaline rocks associated with rifting processes; P1 (282 Ma) – tectonic­metasomatic transformations caused by shear processes.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>метакарбонатно-силикатные породы</kwd><kwd>минералогия</kwd><kwd>геохимия</kwd><kwd>циркон</kwd><kwd>возраст</kwd><kwd>ильменогорский комплекс</kwd></kwd-group><kwd-group xml:lang="en"><kwd>metacarbonate-silicate rocks</kwd><kwd>mineralogy</kwd><kwd>geochemistry</kwd><kwd>zircon</kwd><kwd>age</kwd><kwd>ilmenogorsky complex</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Багдасаров Ю.А. 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