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 10.31897/PMI.2021.2.7 pmi-14675 https://pmi.spmi.ru/pmi/article/view/14675 Геология Geology Unusual metasomatites (phyolithites) in the Kolvitskiy gabbro-anorthosite rock mass: composition and structural position Необычные метасоматиты (фиолититы) в Колвицком габбро-анортозитовом массиве: состав и структурное положение Terekhov Evgenii N. Терехов Е. Н. Terekhov Evgenii N. terekhoff.zhenya@yandex.ru 0000-0002-0489-4545 Геологический институт Российской академии наук (Москва, Россия) Geological Institute of the Russian Academy of Sciences (Moscow, Russia) Makeev Aleksandr B. Макеев А. Б. Makeev Aleksandr B. abmakeev@mail.ru 0000-0001-8815-0959 Институт геологии рудных месторождений, петрографии, минералогии и геохимии Российской академии наук (Москва, Россия) Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (Moscow, Russia) Baluev Aleksandr S. Балуев А. С. Baluev Aleksandr S. abaluev@yandex.ru 0000-0003-3597-4430 Геологический институт Российской академии наук (Москва, Россия) Geological Institute of the Russian Academy of Sciences (Moscow, Russia) Konilov Aleksandr N. Конилов А. Н. Konilov Aleksandr N. chalma@bk.ru 0000-0002-9750-3573 Геологический институт Российской академии наук (Москва, Россия) Geological Institute of the Russian Academy of Sciences (Moscow, Russia) Van Konstantin V. Ван К. В. Van Konstantin V. chalma@bk.ru Институт экспериментальной минералогии Российской академии наук (Черноголовка, Россия) Institute of Experimental Mineralogy of the Russian Academy of Sciences (Chernogolovka, Russia) 24 06 2021 2021 248 232 242 28 01 2021 21 04 2021 24 06 2021 © Evgenii N. Terekhov, Aleksandr B. Makeev, Aleksandr S. Baluev, Aleksandr N. Konilov, Konstantin V. Van 2021 Е. Н. Терехов, А. Б. Макеев, А. С. Балуев, А. Н. Конилов, К. В. Ван Evgenii N. Terekhov, Aleksandr B. Makeev, Aleksandr S. Baluev, Aleksandr N. Konilov, Konstantin V. Van CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/14675

Комплексная минералого-геохимическая и геолого-структурная характеристика проявления редкого коллекционного камня фиолетового цвета фиолитита в юго-западной части Кольского полуострова. Это метасоматическая порода, образовавшаяся в условиях хрупких деформаций по габбро-анортозитам палеопротерозойского Колвицкого массива. В результате калиевого метасоматоза плагиоклаз исходных пород был замещен мелкозернистым агрегатом слюды мусковит-фенгитового состава с вкраплениями Ва-алюмоселадонита (до 20-30 мкм). Ва-алюмоселадонит содержит 6,6-10,5 % по массе BaO. Марганец – единственный хромофор, который накапливается в породе в процессе метасоматоза. Именно марганец обеспечивает лилово-фиолетовую окраску псевдоморфоз слюды по анортиту. Фиолитит истощен REE и имеет положительную Eu-аномалию. Фиолититы приурочены к участкам трещиноватости северо-восточного простирания, находящимся в зоне динамического влияния северо-западного замыкания Онежского-Кандалакшского рифта рифейского возраста. С формированием этой структуры связаны и другие образования (инъекционные конгломераты и лампроиты), обязанные своим происхождением интенсивному флюидному потоку.

Complex mineralogical, geochemical, and geological-structural characteristics of a rare collection stone of violet color, phyolithite, in the southwestern part of the Kola Peninsula. This is a metasomatic rock formed under the conditions of brittle deformations on gabbro-anorthosites of the Paleoproterozoic Kolvitskiy rock mass. As a result of potassium metasomatosis, the plagioclase of the initial rocks was replaced by a fine-grained mica aggregate of muscovite-phengite composition with inclusions of Va-aluminoseladonite (up to 20-30 microns). Ba-aluminoseladonite contains 6.6-10.5 % by weight of BaO. Manganese is the only chromophore that accumulates in the rock during metasomatosis. It is manganese that provides the purple-violet color of pseudomorphs of mica according to anorthite. The phyolithites is depleted by REE and has a positive Eu-anomaly. The phyolithites are confined to the areas of fracturing of the north-eastern strike, located in the zone of dynamic influence of the north-western closure of the Onega-Kandalaksha rift of the Riphean age. Other formations (injection conglomerates and lamproites) are also associated with the formation of this structure, which owe their origin to an intense fluid flow.

 Ключевые слова фиолититы мусковит габбро-анортозит Онежско-Кандалакшский рифт зона аккомодации рифей инъ-екционные конгломераты Keywords phyolithites muscovite gabbro-anorthosite Onega-Kandalaksha rift accommodation zone Riphean injec-tion conglomerates Arzamastsev A.A., Fedotov Zh.A., Arzamastseva L.V. Dike magmatism of the north-eastern part of the Baltic Shield. St. Petersburg: Nauka, 2009, p. 383 (in Russian). Arzamastsev A.A., Fedotov Zh. A., Arzamastseva L.V. Dike magmatism of the north-eastern part of the Baltic Shield. St. Petersburg: Nauka, 2009, p. 383 (in Russian). https://www.rfbr.ru/rffi/ru/books/o_17757#1 Vasileva T.I., Przhiyalgovskii E.S. Evolution of stress fields in thePoryaguba dike field (Kandalaksha gulf, White Sea). Geotectonics. 2006. Vol. 40. N 1, p. 53-63. DOI: 10.1134/S0016852106010055 Vasileva T.I., Przhiyalgovskii E.S. Evolution of stress fields in thePoryaguba dike field (Kandalaksha gulf, White Sea). Geotectonics. 2006. Vol. 40. N 1, p. 53-63. 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