K.V. Repina. ABOUT THE STAGES OF MINERAL FORMATION IN CARBONATE ROCKS FROM THE NOVOTROITSK DEPOSIT, THE ZONE BETWEEN THE DONBAS AND THE PRIAZOV MEGABLOCK

https://doi.org/10.15407/mineraljournal.42.02.020

UDC 553.2

ABOUT THE STAGES OF MINERAL FORMATION IN CARBONATE ROCKS FROM THE NOVOTROITSK DEPOSIT, THE ZONE BETWEEN THE DONBAS AND THE PRIAZOV MEGABLOCK

K.V. Repina, Graduate Student. Donetsk National Technical University

2, Shibankova Square, Pokrovsk, Ukraine, 85302

E-mail: ecoseka@gmail.com

https://orcid.org/0000-0002-1382-2105

T.P. Volkova, DrSc (Geology), Prof. Donetsk National Technical University

2, Shibankova Square, Pokrovsk, Ukraine, 85302

E-mail: voltep4@gmail.com

https://orcid.org/0000-0003-2492-6310

V.M. Zagnitko, DrSc (Geology), Prof.

Kyiv Taras Shevchenko National University

Educational-scientific institute "Institute of Geology"

90, Vasylkivska Str., Kyiv, Ukraine, 03022

E-mail: zagnitkow@i.ua

ResearcherID I-2246-2018

V.S. Moroz, Researcher Fellow

M.P. Semenenko Institute of Geochemistry,

Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: office.igmr@gmail.com

L.I. Proskurka, Junior Research Fellow.

M.P. Semenenko Institute of Geochemistry,

Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: igmrproskurko@gmail.com

https://orcid.org/0000-0001-5760-2000

Language: Ukrainian

Mineralogical journal 2020, 42 (2): 20-31

Abstract:

The article presents results of geochemical features of carbonate rocks and ore associations of the zone between the Donbas and the Priazov megablock of the Ukrainian Shield, in particular, the Novotroitsk deposit and adjacent areas. The Novotroitsk deposit consists of a number of blocks bordered by faults from all sides. The northern boundary of the deposit runs along the western ending of the South-Volnovakha fault zone. In the south, the site is bordered by sub-latitudinal Dolomite fault, and the western border coincides with the Velyko-Anadol fault. Ore mineralization in the deposit is represented by Cu, Pb, Zn, Mo and other sulfides. Sulfide mineralization occurs both in veins and as phenocrysts of pyrite, chalcopyrite, bornite, arsenopyrite, chalcosine in the groundmass of carbonate rocks. In quartz veins and breccia zones phenocrysts of molybdenite are present in association with chalcopyrite, galena, sphalerite. Fluorite mineralization was found in carbonate rocks of single wells of the Novotroitsk deposit, that are located near the Velyko-Anadol fault. Isotope-geochemical studies of carbonate veins, veinlets and host rocks, with taking into account various geochemical and mineralogical features, made it possible to identify several groups of carbonate paragenesis that correspond to the mineral formation stages. The first stage of mineral formation resulted from the dynamics of the marine regime occurred within the zone between the Donbas with the Priazov block in the Carboniferous. Samples of ordinary limestones of the Novotroitsk deposit have composition of stable oxygen and carbon isotopes that is typical of carbonates. The presence of negative δ13C values indicates a change towards more recovery conditions of marine regime, which is characteristic of the Early Visean C1va. The second and third stages of mineral formation are associated with phases of tectonic-magmatic activization (during Devonian and Permian-Triassic). In general, medium- and low-temperature ore-forming hydrothermals prevailed. With increasing temperature, water was evaporates from carbonates, interacted with the host rocks and turned into a mineral-forming fluid. On passing through permeable fractured, brecciated carbonate rocks, it promoted the redeposition of carbonate material and the formation of ore minerals. The range of changes in the isotopic composition of these carbonates varies widely depending on the mineral formation temperature. The subsequent stages of mineral formation occurred during the processes of multiple dissolution-redeposition of carbonates. These carbonates are associated with tectonic block dislocations of the zone and the circulation of solutions in permeable areas. In this case, abiogenic redistribution of carbon isotopes occurred, when the heavy 13С isotope was accumulated in residual carbonates, and lighter fractions removed from mineralization zones.

Keywords: limestones, dolomites, tectonic zones, andesitic bases, ores, carbonate isotopic composition, mineral formation processes.

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