gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-3-0899LHIHSRgtcrust-2301Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSОЦЕНКА ВОЗРАСТА И ГЕОДИНАМИЧЕСКОЙ ПОЗИЦИИ МАЛО-ОЙНОГОРСКОГО W-Mo МЕСТОРОЖДЕНИЯ (ЗАПАДНОЕ ЗАБАЙКАЛЬЕ): ПО РЕЗУЛЬТАТАМ ДАТИРОВАНИЯ ЦИРКОНОВ ИЗ ВМЕЩАЮЩИХ ГРАНИТ-ПОРФИРОВAN ESTIMATION OF THE AGE AND GEODYNAMIC POSITION OF THE MALO-OINOGOR W-Mo DEPOSIT (SOUTHWESTERN TRANSBAIKALIA) BASED ON DATING OF ZIRCONS FROM ORE-HOSTING GRANITE-PORPHYRIEShttps://orcid.org/0000-0001-5237-6614ХубановВ. Б.KhubanovV. B.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

v.khubanov@yandex.ruhttps://orcid.org/0000-0003-1381-4954ДамдиноваЛ. Б.DamdinovaL. B.

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия 

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

https://orcid.org/0000-0002-6701-2570ЕлбаевА. Л.ElbaevA. L.

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия 

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

https://orcid.org/0000-0002-4142-7663ДамдиновБ. Б.DamdinovB. B.

117545, Москва, Варшавское ш., 129, к. 1 

129-1 Varshavskoe Rte, Moscow 117545

https://orcid.org/0000-0002-2239-4608ХубановаА. М.KhubanovaA. M.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

Институт физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian FederationГеологический институт им. Н.Л. Добрецова СО РАНРоссияDobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationЦентральный научно-исследовательский геологоразведочный институт цветных и благородных металловРоссияCentral Research Institute of Geological Prospecting for Base and Precious MetalsRussian Federation202618062026173899899Copyright © Хубанов В.Б., Дамдинова Л.Б., Елбаев А.Л., Дамдинов Б.Б., Хубанова А.М., 20262026Хубанов В.Б., Дамдинова Л.Б., Елбаев А.Л., Дамдинов Б.Б., Хубанова А.М.Khubanov V.B., Damdinova L.B., Elbaev A.L., Damdinov B.B., Khubanova A.M.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/2301

Мало-Ойногорское вольфрам-молибденовое (W-Mo) месторождение расположено в Закаменском рудном узле Джидинского рудного района Западного Забайкалья, и по запасам W и Mo оно считается крупным. Оруденение локализовано в пределах штока гранит-порфиров и в окружающих его метаморфических породах хасуртинской свиты. Особенности геологических взаимоотношений с окружающими породами, минералого-петрографического и геохимического состава гранит-порфиров свидетельствуют о том, что шток является дорудным и развитие рудоносных грейзенов произошло намного позднее времени его формирования. U-Pb датированием (LA-ICP-MS) цирконов из гранит-порфиров Мало-Ойногорского штока получено значение изотопного возраста 310±2.5 млн лет, что не соответствует мезозойскому возрасту гранит-порфиров гуджирского интрузивного комплекса, с которыми генетически связывают W-Mo минерализацию Джидинского рудного района, и в частности Закаменского рудного узла. Широкое распространение в гранит-порфирах штока цирконов с признаками потери радиогенного свинца позволило оценить вероятный поздний временной порог (132±6 млн лет назад) проявления высокотемпературного гидротермального метасоматоза, в ходе которого могло произойти переуравновешивание U-Pb изотопной системы. Этот возрастной предел в рамках погрешности сопоставим со временем становления гуджирской рудно-магматической системы (133–123 млн лет). Становление Мало-Ойногорского штока гранит-порфиров около 310 млн лет назад обусловлено началом формирования Монгольско-Забайкальского вулканоплутонического пояса при Монголо-Охотском орогенезе, который, в свою очередь, возник вследствие субдукции плиты Монголо-Охотского палеоокеана под южную окраину Сибирского континента в позднем палеозое – раннем мезозое. Предполагается, что W-Mo оруденение связано с деятельностью гидротерм, источником которых являлся рудоносный раннемеловой Гуджирский интрузив и/или система интрузивов-сателлитов, не вскрытых в настоящее время. Формирование Гуджирской рудно-магматической системы Закаменского рудного узла произошло в условиях тектонического растяжения в период раннемелового распада Монголо-Охотского орогена. Приведены аргументы, что Закаменский рудный узел, к которому приурочено Мало-Ойногорское W-Mo месторождение, является перспективной площадью для обнаружения новых залежей редкометалльных полезных ископаемых, скрытых на глубине.

The large Malo-Oinogor W-Mo deposit is located in the Zakamensk ore cluster of the Dzida ore district of the Western Transbaikalia. The W-Mo mineralization area is located within the Malo-Oinogor granite porphyry stock and surrounding metamorphic rocks of the Khasurta formation. The features of geological relationships with the surrounding rocks, as well as mineralogical-petrographic and geochemical features of the granite porphyries, indicate that the stock relates to the pre-ore stage and that the development of ore-bearing greisens occurred much later than the stock formation. The U-Pb (LA-ICP-MS) dating of zircons from granite porphyries of the Malo-Oinogor stock yielded an isotopic age of 310±2.5 Ma which does not correlate with the Mesozoic age of the granite porphyries from the Gudzhir intrusive complex, genetically associated with the W-Mo mineralization of the Dzhida ore district and, in particular, the Zakamensk ore cluster. The widespread occurrence of zircons, prone to lead loss, in the granite porphyry stock made it possibe to assess the probable threshold time of development of high-temperature hydrothermal metasomatism (132±6 Ma ago) in which U-Pb isotopic re-equilibration could take place. Within the margin of error this threshold time is comparable to the formation time of the Gudzhir ore-magmatic system (133–123 Ma). The formation of the Malo-Oinogor granite porphyry stock 310 Ma ago is due to the beginning of the formation of the Mongolian-Transbaikalian volcanoplutonic belt (PZ3–MZ1) during Mongol-Okhotsk orogeny which, in its turn, was related to the subduction of the Mongolian-Okhotsk paleooceanic plate beneath the southern margin of the Siberian continent. It is believed that W-Mo mineralization is related to hydrothermal activity, the source of which was the Early Cretaceous ore-bearing Gudzhir intrusive. The Gudzhir ore-magmatic system of the Zakamensk ore cluster was formed under tectonic extension during the Early Cretaceous Mongol-Okhotsk orogenic collapse. The arguments are presented for the fact that the Zakamensk ore cluster, to which the Malo-Oinogor W-Mo deposit is confied, is a promising area for the discovery of new deep rare metal reserves.

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