ГЕНЕЗИС ГРАНАТ-ПИРОКСЕНОВЫХ СИЕНИТОВ (СВЯТОНОСИТОВ) МАЛОБЫСТРИНСКОГО МАССИВА (СЛЮДЯНСКИЙ КОМПЛЕКС, ЮЖНОЕ ПРИБАЙКАЛЬЕ): РЕЗУЛЬТАТЫ ГЕОХИМИЧЕСКИХ И ИЗОТОПНЫХ ИССЛЕДОВАНИЙ

Исследованы сиениты и святоноситы (андрадитсодержащие сиениты) Малобыстринского массива слюдянского комплекса (Южное Прибайкалье, Сибирь), а также крупная дайка монцонитов, по возрасту и составу сходная с породами рассматриваемого массива. Исследованные породы относятся к ряду существенно железистых и метаглиноземистых с индексом ASI ниже 1. Породы характеризуются содержанием SiO₂ 49–65 мас. % и суммой щелочей K₂O+Na₂O до 12 мас. %, MgO ниже 4 мас. %, высокими содержаниями TiO₂ – до 2.5 мас. %, Al₂O₃ – до 17 мас. %. СаО варьируется в широком интервале значений – от 2.2 до 14.7 мас. %. По микроэлементному спектру породы близки между собой и характеризуются общими трогами Th-U, Nb-Ta и Ti. На спектрах распределения редкоземельных элементов для всего комплекса пород наблюдается очень слабая отрицательная аномалия Eu. Полученный Sm-Nd возраст святоноситов Малобыстринского массива 487.1±6.1 млн лет (СКВО=0.99). Диапазон скорректированных на возраст значений εNd_(t) в сиените и монцоните составляет –1.9…–2.8, при εSr_(t) 21–30, а в святоноситах εNd_(t) –3.8…–4.1 при близких εSr_(t) – 26. Модельный возраст для всех рассматриваемых пород T_Nd(DM) имеет мезопротерозойские значения 1.3–1.4 млрд лет. Основываясь на химическом и Sr-Nd-изотопном составе исследованных магматических пород, можно предположить, что их образование связано с плавлением коровых амфиболитов. Кристаллизация андрадитового граната в сиенитовой магме вызвана контаминацией расплава вмещающими метаморфическими породами слюдянского комплекса.

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