gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2025-16-4-0834PAOJKNgtcrust-2071Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSПРИРОДА ЦИНКОВЫХ ХРОМИТОВ ИЗ ПОЛОСЧАТЫХ ИЛЬМЕНИТ-ГЕМАТИТОВЫХ КВАРЦЕВЫХ ПЕСЧАНИКОВ БЕЗЫМЯННОЙ ТОЛЩИ ТУВИНО-МОНГОЛЬСКОГО ТЕРРЕЙНА (ЮГО-ВОСТОЧНАЯ ЧАСТЬ ВОСТОЧНОГО САЯНА, РОССИЯ)THE NATURE OF ZINC CHROMITES FROM BANDED ILMENITE-HEMATITE QUARTZ SANDSTONE OF THE BEZYMYANNAYA FORMATION OF THE TUVA-MONGOLIAN TERRANE (SOUTHEASTERN PART OF THE EAST SAYAN, RUSSIA)https://orcid.org/0000-0002-2951-5062КиселеваО. Н.KiselevaO. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

kiseleva_on@igm.nsc.ruhttps://orcid.org/0000-0001-8504-4421БелянинД. К.BelyaninD. K.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090

1 Pirogov St, Novosibirsk 630090

https://orcid.org/0000-0002-5164-7571АйриянцЕ. В.AiriyantsE. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-8095-4485ЖмодикС. М.ZhmodikS. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-8131-2564КуликовЮ. И.KulikovYu. I.

670034, Улан-Удэ, ул. Хахалова, 2, Республика Бурятия

 Khakhalov St, Ulan-Ude 670034, Republic of Buryatia

РощектаевП. А.RoshchektaevP. A.

670000, Улан-Удэ, ул. Смолина, 24а, Республика Бурятия

24a Smolin St, Ulan-Ude 670000, Republic of Buryatia

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationООО «Рифей»РоссияRifey LLCRussian FederationБурятский государственный университет им. Д. БанзароваРоссияBanzarov Buryat State UniversityRussian Federation202516082025164834834Copyright © Киселева О.Н., Белянин Д.К., Айриянц Е.В., Жмодик С.М., Куликов Ю.И., Рощектаев П.А., 20252025Киселева О.Н., Белянин Д.К., Айриянц Е.В., Жмодик С.М., Куликов Ю.И., Рощектаев П.А.Kiseleva O.N., Belyanin D.K., Airiyants E.V., Zhmodik S.M., Kulikov Y.I., Roshchektaev P.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/2071

В статье приводятся первые данные о детритовых цинковых хромитах из полосчатых ильменит-гематитовых кварцевых песчаников терригенной безымянной толщи Тувино-Монгольского террейна юго-восточной части Восточного Саяна. В акцессорных и рудных хромитах из офиолитовых комплексов юго-восточной части Восточного Саяна содержание цинка невысокое и укладывается в диапазон 0.2–1.5 мас. % ZnO. Методом сканирущей электронной микроскопии изучены морфологические и микроструктурные особенности, химический состав детритовых цинковых хромитов. Изучение химического состава минеральных фаз оксидно-титанжелезистых прослоев, состоящих из ильменогематита, Ti-содержащего гематита, псевдобрукита, псевдорутила, цинкового хромита, показало, что Zn (12–27 мас. % ZnO) присутствует только в хромите и совершенно отсутствует в других рудных минералах, что свидетельствует не о том, что хромит обогащался цинком в области сноса и воздействием на терригенную породу при метаморфизме или метасоматозе, а о том, что это особенность коренного источника. Коренным источником изученных детритовых хромитов являются ультрабазит-базитовые породы, их метасоматизированные разности и подиформные хромититы офиолитовых комплексов юго-восточной части Восточного Саяна. В процессе метасоматических изменений мантийных перидотитов, хромититов, под воздействием флюида/гидротермального раствора в хромите происходило замещение Mg на Zn. Локальное обогащение хромитов цинком осуществлялось на стадии субдукции или обдукции офиолитов. Источником цинка могли быть породы субдуцирующего слэба – вулканогенно-осадочные породы, содержащие фрагменты субмаринных гидротермально-осадочных сульфидных руд, обогащенных Zn и вовлеченных в процессы метасоматического изменения мантийных перидотитов и хромититов.

The paper presents the first data on detrital zinc chromites from banded ilmenite-hematite sandstone of the terrigenous Bezymyannaya formation of the Tuva-Mongolian terrane in the eastern part of the East Sayan. The zinc content of the accessory and ore chromites from the ophiolite complexes in the southeastern part of the East Sayan is not high and falls within the range of 0.2 to 1.5 wt. % ZnO. Scanning electronic microscopy has been used to study morphological and structural features and chemical composition of detrital zinc chromites. The study of chemical composition of mineral phases of titanium-ferruginous oxide interlayers, composed of ilmenohematite, Ti-hematite, pseudobrookite, pseudorutile and zinc chromite, has shown that Zn (12–27 wt. % ZnO) is present only in chromite and entirely absent in other ore minerals, i.e. that zinc enrichment in chromite is a feature of the ore body rather than the result of metamorphism or metensomatoses of terrigenous rocks in the source area. The ore bodies of the studied detrital chromites are associated with ultrabasites and basites, their metasomatized varieties, and podiform chromites from the ophiolite complexes in the southeastern part of the East Sayan. Metasomatic changes of mantle peridotites and chromitites and the effects of fluid/hydrothermal solution parameters resulted in substitution of Mg by Zn in the chromite. Zinc could originate from the subducting-slab rocks – volcanic-sedimentary rocks containing the fragments of submarine hydrothermal sulfide ore deposits, zinc-enriched and involved in metasomatic changes of peridotites and chromites.

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The authors declare that there are no conflicts of interest present.