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Aleksandr B. Makeev
Aleksandr B. Makeev
Chief Researcher, Ph.D., Dr.Sci.
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry
Chief Researcher, Ph.D., Dr.Sci.
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry
Moscow
Russia
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Articles

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
Geology
  • Date submitted
    2018-01-23
  • Date published
    2018-08-26

THE FIRST DATA ON THE U-PB AGE (TIMS AND LA-ICP-MS) OF RUTILE FROM THE ICHETJU POLYMINERAL OCCURRENCE, THE MIDDLE TIMAN

A study on the U-Pb age of rutile from the Ichetju polymineral occurrence has been done for the first time by LA-ICP-MS and TIMS methods. It was established that rutile originates from various sources with different ages (presumably, ca. 1000, 1660, 1860 and 1980 Ma), but all the rutile types have undergone a common thermal event at ca . 580 Ma. Obtained results are consistent with U-Pb zircon data for the Ichetju occurrence and the Pizhemskoe deposit. According to modern concepts, the closure temperature for the U-Pb system in rutile is higher than 500  ° С, which suggests fairly high-temperature conditions of the rutile hydrothermal transformation during the formation of the deposits in Riphean. Obviously, a placer hypothesis of formation of titanium deposits of the Middle Timan which is supported by a number of researchers does not explain such temperature of rutile alteration.

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S. G. Skublov, A. O. Krasotkina, A. B. Makeev, N. G. Rizvanova, E. Koiman (2018) THE FIRST DATA ON THE U-PB AGE (TIMS AND LA-ICP-MS) OF RUTILE FROM THE ICHETJU POLYMINERAL OCCURRENCE, THE MIDDLE TIMAN. Journal of Mining Institute. Vol 232. p. 357. DOI: 10.31897/pmi.2018.4.357