G.V. Artemenko. SULPHIDE MINERALIZATION IN THE ROCKS OF ALEXANDROVKA INTRUSION (MIDDLE DNIEPER MEGABLOCK OF UKRAINIAN SHIELD)
https://doi.org/10.15407/mineraljournal.41.03.016
UDC 552.43 : 550.42 : 550.93 (477)
SULPHIDE MINERALIZATION IN THE ROCKS OF ALEXANDROVKA INTRUSION (MIDDLE DNIEPER MEGABLOCK OF UKRAINIAN SHIELD)
G.V. Artemenko 1, https://orcid.org/0000-0002-4528-6853
I.A. Samborska 1, https://orcid.org/0000-0003-4298-969X
L.I. Kanunikova 1,
V.K. Butyrin 2
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
E-mail: regulgeo@gmail.com
2 Public Enterprise "Pivdenukrgeologiya"
Dnipro, Ukraine, 49005
Language: Russian
Mineralogical journal 2019, 41 (3): 16-23
Abstract: In the Alexandrovka Intrusion, sulphide mineralization is associated with metamorphosed pyroxenites and confined to the tectonic zones of the South-Nikopol fault. Sulphides are observed in the form of plates and grains of irregular shape ranging in size from 0.03 to 2.0 mm, in the form of scattered impregnations, vein lets, nests and shlieren. At short intervals, they form almost continuous aggregates, among which occur the "inclusions" of pyroxene and amphibole — a sulphide-silicate rock (ore). Pyroxene is partially or completely replaced by amphibole and pyrrhotite. The "inclusions" are xenomorphic, less often idiomorphic in shape. Pyroxenes are represented by monoclinic varieties — diopside (En41—46Wo46—48Fs8—11) and endiopside (En46—47Wo44—45Fs10). The chemical composition of amphiboles corresponds to the group of calcium amphiboles and presented by actinolite and magnesian hornblende, which are formed under the conditions of amphibolite, epidote-amphibolite and green schist facies of metamorphism. Sulphides are represented by pentlandite — chalcopyrite — pyrrhotite association, where pyrrhotite is a predominant mineral which contains admixtures of Co (up to 0.26 %) and Ni (up to 0.61 %). Chalcopyrite is present in a small amount as individual grains and has an insignificant admixture of Co and Ni. Pentlandite forms small inclusions in pyrrhotite. It contains admixtures of Co (up to 8.20 %) and Au (up to 0.15 %).
Keywords: Alexandrovka intrusion, Middle Dnieper megablock, metapyroxenites, sulphides, pyrrhotite, chalcopyrite, pentlandite, cobalt, nickel, gold.
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