2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University UMQOXK pmi-16082 https://pmi.spmi.ru/pmi/article/view/16082 Геология Geology Inclusions of diamond crystals in the tourmaline of the schorl-uvite series: problems of genesis Включения кристаллов алмаза в турмалине шерл-увитового ряда: проблемы генезиса Korsakov Andrei V. Корсаков А. В. Korsakov Andrei V. korsakov@igm.nsc.ru 0000-0002-4922-7658 Институт геологии и минералогии им. В.С.Соболева СО РАН (Новосибирск, Россия) V.S.Sobolev Institute of Geology and Mineralogy Siberian Branch RAS (Novosibirsk, Russia) Mikhailenko Denis S. Михайленко Д. С. Mikhailenko Denis S. pazilovdenis@igm.nsc.ru 0000-0003-0585-3021 Институт геологии и минералогии им. В.С.Соболева СО РАН (Новосибирск, Россия) V.S.Sobolev Institute of Geology and Mineralogy Siberian Branch RAS (Novosibirsk, Russia) Zhang Le Чжан Лэ Zhang Le yigangxu@gig.ac.cn 0000-0001-9161-0653 Институт геохимии и центр изучения глубинного строения Земли Китайской академии наук (Гуанчжоу, Китай) State Key Laboratory of Isotope Geochemistry and CAS Center for Excellence in Deep Earth Science, Guangzhou Institute of Geochemistry, Chinese Academy of Science (Guangzhou, China) Xu Yi-Gang Шу Юганг Xu Yi-Gang yigangxu@gig.ac.cn 0000-0002-9531-7208 Институт геохимии и центр изучения глубинного строения Земли Китайской академии наук (Гуанчжоу, Китай) State Key Laboratory of Isotope Geochemistry and CAS Center for Excellence in Deep Earth Science, Guangzhou Institute of Geochemistry, Chinese Academy of Science (Guangzhou, China) 18 05 2023 2023 264 833 841 01 12 2022 19 01 2023 25 12 2023 © Andrei V. Korsakov, Denis S. Mikhailenko, Le Zhang, Yi-Gang Xu 2023 А. В. Корсаков, Д. С. Михайленко, Лэ Чжан, Юганг Шу Andrei V. Korsakov, Denis S. Mikhailenko, Le Zhang, Yi-Gang Xu CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/16082

Детально исследованы минералого-геохимические особенности кристаллов турмалина (шерл-увитового ряда), содержащих включения кристаллов алмаза, из гранат-клинопироксеновых пород Кумдыкольского месторождения (Северный Казахстан). Формирование основных породообразующих минералов (гранат + К-содержащий клинопироксен) происходило в поле стабильности алмаза при 4-6 ГПа и 950-1000 °С. Кристаллизация К-содержащего клинопироксена при этих параметрах возможна в присутствии ультракалиевого флюида или расплава, образовавшегося в результате плавления корового материала, в зонах субдукции. Кристаллы турмалина (до 1 см), содержащие включения алмаза, выполняют жилы, секущие высокобарические ассоциации. Состав отдельных зон варьирует от шерла до увита в пределах как одного зерна, так и образца в целом. Содержание калия в этом турмалине не превышает 0,1 мас.% К2О, а изотопный состав бора δ11B варьирует от –10 до –15,5 ‰, что значительно отличается от установленного ранее изотопного состава бора в кристаллах маруямаита (δ11B 7,7 ‰ в ядре и –1,2 ‰ в кайме) этого же месторождения. Анализ полученных данных о δ11B в турмалинах алмазной субфации метаморфизма в пределах Кумдыкольского месторождения позволяет предположить существование двух источников бора, следствием чего стала кристаллизация К-содержащих кристаллов турмалина (маруямаит-дравитового ряда) и безкалиевых турмалинов серии шерл-увитового ряда.

The mineralogical and geochemical features of diamond-bearing tourmaline crystals (schorl-uvite series) from garnet-clinopyroxene rocks of the Kumdy-Kol deposit (Northern Kazakhstan) have been studied in detail. The formation of the main rock-forming minerals (garnet + K-bearing clinopyroxene) occurred in the diamond stability field at 4-6 GPa and 950-1000 °C. Crystallization of K-bearing clinopyroxene at these parameters is possible in the presence of an ultra-potassic fluid or melt formed because of crustal material melting in subduction zones. Tourmaline crystals (up to 1 cm) containing diamond inclusions perform veins crosscutting high-pressure associations. The composition of individual zones varies from schorl to uvite within both a single grain and the sample as a whole. The potassium content in this tourmaline does not exceed 0.1 wt.% K2O, and the isotopic composition of boron δ11B varies from –10 to –15.5 ‰, which significantly differs from the previously established isotopic composition of boron in maruyamaite crystals (δ11B 7.7 ‰ in the core and –1.2 ‰ in the rim) of the same deposit. Analysis of the obtained data on δ11B in the tourmalines from the diamond-grade metamorphic rocks within the Kumdy-Kol deposit suggests the existence of two boron sources that resulted in crystallization of K-bearing tourmaline crystals (maruyamaite-dravite series) and potassium-free tourmalines of the schorl-uvite series.

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