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Aleksandr N. Konilov
Aleksandr N. Konilov
Senior Researcher
Geological Institute of the Russian Academy of Sciences
Senior Researcher
Geological Institute of the Russian Academy of Sciences
Moscow
Russia
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Geology
  • Date submitted
    2021-01-28
  • Date accepted
    2021-04-21
  • Date published
    2021-05-25

Unusual metasomatites (phyolithites) in the Kolvitskiy gabbro-anorthosite rock mass: composition and structural position

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.

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Evgenii N. Terekhov, Aleksandr B. Makeev, Aleksandr S. Baluev, Aleksandr N. Konilov, Konstantin V. Van (2021) Unusual metasomatites (phyolithites) in the Kolvitskiy gabbro-anorthosite rock mass: composition and structural position. Journal of Mining Institute. Vol 248. p. 232-242. DOI: 10.31897/PMI.2021.2.7