THE REGULARITIES OF THE MINERAL COMPOSITION OF KRYVYI RIH BASIN MAGNETITE QUARTZITES IN CONNECTION WITH RIEBECKITIZATION

https://doi.org/10.15407/mineraljournal.40.02.027

UDC  549.643.32 : 553.31 (477.63)

V.O. Streltsov (1, 2), V.D. Evtekhov (2), A.V. Evtekhova (2)
(1) Ingulets Ore Mining and Processing Works
47, Rudnaya Str., Kryvyi Rih, Ukraine, 50002
E-mail: misterstrelcov90@gmail.com
(2) State Institution of Higher Education
"Kryvyi Rih National University"
11, Vitalyi Matusevich Str., Kryvyi Rih, Ukraine, 50002
E-mail: evtekhov@gmail.com, eva.anna23@gmail.com
Language: Ukrainian
Mineralogical journal 2018, 40 (2): 27-35

THE REGULARITIES OF THE MINERAL COMPOSITION OF KRYVYI RIH BASIN MAGNETITE QUARTZITES IN CONNECTION WITH RIEBECKITIZATION

Abstract: The results of mineralogical studies of low-grade magnetite ores (magnetite quartzites) of Kryvyi Rih basin riebeckitized to various extents are presented. The ores transformed as a result of sodium metasomatism form more than a half of the total mass of the productive strata of Pervomayske, Hannivka, Petrivske, and Artemivka deposits; they are also represented in the productive strata of Ingulets, Valyavkynske and other deposits of the Kryvbass. The most common variety of sodium metasomatites are riebeckite ones, their amount makes up about 90 % of the total sodium metasomatites content in the productive strata. The content of chemical components in magnetite ores regularly changed with increasing the intensity of riebeckitization. The results of petrochemical studies of the riebeckite metasomatites of the Pervomayske deposit showed that Na2O content gradually increases from the primary magnetite quartzites through the intermediate zones (riebeckite-containing magnetite quartzites and riebeckite-magnetite quartzites) to magnetite-riebeckite metasomatites (riebeckitites) (on the average from 0.11 to 2.34 mass. %), Fetot (from 39.11 to 40.24 mass. %), Fesil (from 0.58 to 12.08 mass. %), Fesulf (from 0.12 to 0.18 mass. %) and the SiO2 content decreases (from 39.65 to 37.23 mass. %), Femagn (rom 34.85 to 27.65 mass. %), Fehem (from 3.34 to 0.24 mass. %), Fecarb (from 0.22 to 0.09 mass. %). Riebeckitization of magnetite quartzites was accompanied by significant changes in their mineral composition: the amount of magnetite decreased by almost 10 mass. % due to its partial substitution by riebeckite. The decrease in the content of quartz was even more significant — from 43.33 to 3.16 mass. %. There was also an almost complete replacement of hematite with riebeckite. Cummingtonite underwent pseudomorphization with magnesioriebeckite. The formation of a number of minor sodium and potassium-containing minerals such as aegirine, tetraferribiotite, and celadonite, which usually fill jointly with quartz cross veinlets in riebeckite metasomatites, was associated with riebeckitization. The results of the mineralogical study of riebeckite metasomatites are the basis for improving the methods of geological, mineralogical, technological mapping of deposits, correcting mineralogical-technological classifications of ores, optimizing methods for blending ores before feeding concentration plants, and forecasting quality indicators of the magnetite concentrate.

Keywords: banded iron formation, Kryvyi Rih basin, riebeckite metasomatites, petrochemistry, mineralogy.

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