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

Authors:
Evgenii N. Terekhov1
Aleksandr B. Makeev2
Aleksandr S. Baluev3
Aleksandr N. Konilov4
Konstantin V. Van5
  • 1 — Ph.D., Dr.Sci. Chief Researcher Geological Institute of the Russian Academy of Sciences ▪ Orcid ▪ Scopus
  • 2 — Ph.D., Dr.Sci. Chief Researcher Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry ▪ Orcid ▪ Scopus
  • 3 — Ph.D., Dr.Sci. Leading Researcher Geological Institute of the Russian Academy of Sciences ▪ Orcid ▪ Scopus
  • 4 — Senior Researcher Geological Institute of the Russian Academy of Sciences ▪ Orcid ▪ Scopus
  • 5 — Senior Researcher Institute of Experimental Mineralogy of the Russian Academy of Sciences ▪ Scopus
Date submitted:
2021-01-28
Date accepted:
2021-04-21
Date published:
2021-05-25

Abstract

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.

Keywords:
phyolithites muscovite gabbro-anorthosite Onega-Kandalaksha rift accommodation zone Riphean injec-tion conglomerates
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