Mineral composition of paleoproterozoic metamorphosed massive sulfide ore in the Kola Region (a case study of the Bragino Occurrence, South Pechenga)

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Abstract

Many occurrences and deposits of massive sulfide ores in the Kola Region are connected with the Paleoproterozoic Pechenga—Imandra—Varzuga Rift Belt (2.5—1.7 Ga). They are placed in volcanogenic-sedimentary complexes of South Pechenga (Bragino occurrence) and western part of Imandra-Varzugskaya structural zones (Pyrrhotite Ravine deposit, Tahtarvumchorr occurrence, etc.). The age of massive sulfide ore formation is expected to be about 1.9 Ga. The ores and their host complexes were metamorphosed under conditions close to the amphibolite facies. High degree of metamorphism of massive sulfide ores of the Kola region determined the features of their mineral composition, which are considered on the example of the Bragino occurrence. The article displays ore types, their mineral assemblages, and data on main minerals of ores: pyrrhotite, pyrite, sphalerite, marcasite, etc.

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About the authors

Alena Arkadievna Kompanchenko

Kola Science Centre of the Russian Academy of Sciences

Author for correspondence.
Email: komp-alena@yandex.ru
ORCID iD: 0000-0003-1240-7898

junior researcher, Geological Institute

Russian Federation, 14 Fersman Street, Apatity 184209, Russia

Anatoly Vasil'evich Voloshin

Kola Science Centre of the Russian Academy of Sciences

Email: anatolyvoloshin@yandex.ru

doctor of geological and mineralogical sciences, chief resaercher, Geological Institute

Russian Federation, 14 Fersman Street, Apatity 184209, Russia

Aya Valerievna Bazai

Kola Science Centre of the Russian Academy of Sciences

Email: bazai@geoksc.apatity.ru

candidate of geological and mineralogical sciences, researcher, Geological Institute

Russian Federation, 14 Fersman Street, Apatity 184209, Russia

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2. Fig. 1. Geological scheme of the South Pechenga Structure Zone and position of the Bragino occurrence (modified after: Melezhik, Sturt, 1994; Akhmedov et al., 2004; Skuf’in, Theart, 2005; Reading.., 2013; Kompanchenko et al., 2018).

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3. Fig. 2. Distribution of different ore types at the Bragino occurrence (after: Akhmedov et al., 2004, with modifications).

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4. Fig. 3. Samples of massive pyrrhotite ore of type I.

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5. Fig. 4. Main (а—в) and rare (г—и) minerals of massive pyrrhotite ore of type I. BSE images (б, в, д) and polarized light images (the rest of photos).

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6. Fig. 5. Massive pyrrhotite ore of type II (а) containing relicts of quartz-albite veins (б).

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7. Fig. 6. Main (а—к) and rare (л—п) minerals in massive pyrrhotite ore of type II. BSE images (д, е, о, п) and polarized light images (the rest of photos).

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8. Fig. 7. Massive pyrite ore (а) containing relicts of quartz-albite veins (в, г) and transitional zone between mPy and mPo-II (б). Polished samples.

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9. Fig. 8. Main (а—ж) and rare (з—м) minerals in massive pyrite ore. Reflected polarized light images (а—к) and BSE images (л, м).

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