gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2023-14-6-0728gtcrust-1758Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ И ИСТОЧНИКИ РЕДКОЗЕМЕЛЬНО-ФЛЮОРИТОВЫХ ПРОЯВЛЕНИЙ ЮЖНОЕ И УЛАН-УДЭНСКОЕ, СВЯЗАННЫХ С КАРБОНАТИТОВЫМ МАГМАТИЗМОМ (ЗАПАДНОЕ ЗАБАЙКАЛЬЕ, РОССИЯ)AGE AND SOURCE CHARACTERISTICS OF THE YUZHNOE AND ULAN-UDE REE-FLUORITE OCCURRENCES ASSOCIATED WITH CARBONATITE MAGMATISM (WESTERN TRANSBAIKALIA, RUSSIA)РединаА. А.RedinaA. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ДорошкевичА. Г.DoroshkevichA. G.

630090, Новосибирск, пр-т Академика Коптюга, 3; 670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия; 630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090; 6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia; 1 Pirogov St, Novosibirsk 630090

ПрокопьевИ. Р.ProkopyevI. R.

630090, Новосибирск, пр-т Академика Коптюга, 3; 630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090; 1 Pirogov St, Novosibirsk 630090

ИзбродинИ. А.IzbrodinI. A.

630090, Новосибирск, пр-т Академика Коптюга, 3; 670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия

3 Academician Koptyug Ave, Novosibirsk 630090; 6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

ЯнЮ.YangYu.

100029, Пекин

19 Beitucheng West Road, Chaoyang Dist, Beijing 100029

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; Геологический институт им. Н.Л. Добрецова СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian 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 FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Геологический институт им. Н.Л. Добрецова СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и геофизики Китайской академии наукКитайInstitute of Geology and Geophysics, Chinese Academy of SciencesChina202314122023146728728Copyright © Редина А.А., Дорошкевич А.Г., Прокопьев И.Р., Избродин И.А., Ян Ю., 20232023Редина А.А., Дорошкевич А.Г., Прокопьев И.Р., Избродин И.А., Ян Ю.Redina A.A., Doroshkevich A.G., Prokopyev I.R., Izbrodin I.A., Yang Y.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/1758

В статье представлены новые данные о возрасте и изотопные (Sr, Nd) характеристики для редкоземельно-флюоритовых проявлений Южное и Улан-Удэнское, парагенетически связанных с щелочным карбонатитовым магматизмом. Возрастные оценки флюоритсодержащих пород были получены U-Th-Pb (LA-ICP-MS) методом по бастнезитам и составляют 130.2±1.1 и 136.6±1.9 млн лет для Южного и Улан-Удэнского проявлений соответственно. Значения ƐNd(T) для бастнезита проявления Южное варьируются в диапазоне от –7.41 до –6.08. Для бастнезитов проявления Улан-Удэнского установлены значения ƐNd(T) от –4.28 до –2.67. Карбонатиты проявления Южное характеризуются 87Sr/86Sr(I) в диапазоне от 0.705883 до 0.706011, а в бастнезит-флюоритовых породах Улан-Удэнского проявления значения 87Sr/86Sr(I) составляют 0.70683–0.70687. Полученные возрастные оценки согласуются с опубликованными геохронологическими данными по щелочному карбонатитовому магматизму Центрально-Азиатского складчатого пояса, связанному с позднемезозойской внутриплитной рифтогенной магматической активностью. Изотопные Sr-Nd характеристики бастнезита, а также карбонатитов проявления Южное и бастнезит-флюоритовых пород проявления Улан-Удэнское свидетельствуют в пользу генерации их источников из обогащенной литосферной мантии.

The article presents new data on the age and isotopic (Sr, Nd) characteristics of the Yuzhnoe and Ulan-Ude REE-fluorite occurrences, paragenetically related to alkaline carbonatite magmatism. Age estimates of the fluorite-containing rocks were obtained from bastnaesites using U-Th-Pb (LA-ICP-MS) method and are 130.2±1.1 and 136.6±1.9 Ma for the Yuzhnoe and Ulan-Ude occurrences, respectively. The ƐNd(T) values of the bastnaesites vary from –7.41 to –6.08 for the Yuzhnoe occurrence and from –4.28 to –2.67 for the Ulan-Ude occurrence. The Yuzhnoe carbonatites are characterized by 87Sr/86Sr(I) ratios ranging from 0.705883 to 0.706011, and 87Sr/86Sr(I) ratios obtained for the Ulan-Ude bastnaesite-fluorite rocks are ranging from 0.70683 to 0.70687. The age estimates are consistent with the published geochronological data on alkaline carbonatite magmatism of the Central Asian orogenic belt related to Late Mesozoic intraplate magmatism and rifting. Isotopic Sr-Nd signatures of bastnaesite, as well as of the Yuzhnoe carbonatites and the Ulan-Ude bastnaesite-fluorites, indicate that their source rocks came from the enriched lithospheric mantle.

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