ВОЗРАСТ И ИСТОЧНИКИ РЕДКОЗЕМЕЛЬНО-ФЛЮОРИТОВЫХ ПРОЯВЛЕНИЙ ЮЖНОЕ И УЛАН-УДЭНСКОЕ, СВЯЗАННЫХ С КАРБОНАТИТОВЫМ МАГМАТИЗМОМ (ЗАПАДНОЕ ЗАБАЙКАЛЬЕ, РОССИЯ)

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 Ɛ_Nd(T) для бастнезита проявления Южное варьируются в диапазоне от –7.41 до –6.08. Для бастнезитов проявления Улан-Удэнского установлены значения Ɛ_Nd(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.

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