NATIVE METAL SULFIDE MINERALIZATION OF PERGA ORE KNOT (THE UKRAINIAN SHIELD)

UDC 549.553.277

https://doi.org/10.15407./mineraljournal.39.04.077

B.І. Slobodyan 1, V.І. Pavlyshyn 2, S.M. Bondarenko 2, L.M. Stepanyuk 2, V.O. Syomka 2, S.І. Kurylo 2

1 State Enterprise Ukrainian Geological Company

10, Geophysic Side-Str., Kyiv, Ukraine, 02088

E-mail: sbiv@ukr.net

2 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

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

E-mail: V.I.Pavlyshyn@gmail.com, stepaniuk@nas.gov.ua, sbond.igmr@gmail.com, kurylo.sergiy@gmail.com

NATIVE METAL SULFIDE MINERALIZATION OF PERGA ORE KNOT (THE UKRAINIAN SHIELD)

Language: Ukrainian

Mineralogical journal 2017, 39 (4): 77-88

Abstract: Investigation results of ore minerals found in Perga ore knot (the Ukrainian Shield), which belong to classes of native elements and sulfides are presented. The Perga ore knot, which is also called the Perga ore-and-tectonic knot, is second to none on Ukrainian Shield as to variety of mineral species and geochemical range of elements distributed here. About 70 minerals which belong to different classes — silicates and aluminosilicates, oxides, phosphates, sulfides, haloids, native elements — are found here. Most of them are found for the first time in Ukraine, with some rare minerals being only known in several regions of the world. Sulfide ores are mainly of galenite-bornite-chalcocite-chalcopyrite-sphalerite in composition and characterized by sulfide contents ranging from 5 to 20 %. They are localized within zones of silicification, cataclasis, kalifeldspathization and greisenization of Perga granites. Galena is predominant among sulfide mineral that is found in ore bodies and it comprises 10 to 60 % of total amount of polymetallic mineralization. According to ore mineral studies there are several generation of galena found in supergene enrichment zones. Native silver is concentrated within these zones in association with such sulfides as argentite and stromeyerite. A significant amount of silver is concentrated in secondary copper sulfides (chalcocite, betekhtinite, covelline, digenite) as a result of Ag1+ → Cu1+ isomorphism. Electrum and native copper was found in association with silver. A conclusion is drawn that native metallic sulfide mineralization was formed in the zone of activation of metasomatic processes along deep faults.

Keywords: native metal sulfide mineralization, Perga ore knot, the Ukrainian Shield.

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