Stanislav Jelen - Academia.edu (original) (raw)

Papers by Stanislav Jelen

territory of Slovakia and Transcarpathian region of Ukraine and typical mineral associations foun... more territory of Slovakia and Transcarpathian region of Ukraine and typical mineral associations found here were discussed in the first part of the article [13]. As layered tellurides of bismuth are established both in Transcarpathian region of Ukraine and Slovakia they can be taken as the object to do comparative study of their crystallochemistry. Table 1 and 2 show crystallochemical formulas of bismuth tellurides found in both these regions. We would like to note, that chemical analyses are not given for all minerals listed in [13] (Table 1). Therefore, the data summarized in Table 1 do not completely display all the crystallochemical features of bismuth tellurides of Slovakia. Predominant mineral varieties are related to such structural types as tetradymite (А2Х3), tsumoite (AX ) and pilsenite (А4Х3). There are also some problematic species of bismuth tellurides that have not been studied enough yet. The same situation is observed with tellurides of Transcarpathians which crystalloch...

Applied Geochemistry, 2018

The neutral mine drainage system at Ľubietová in Slovakia is overwhelmingly dominated by copper (... more The neutral mine drainage system at Ľubietová in Slovakia is overwhelmingly dominated by copper (17 ppm in the most concentrated aqueous sample) and sulfate and almost devoid of iron (0.7 ppb in the most concentrated aqueous sample). This mine drainage is generated by oxidative dissolution of chalcopyrite (CuFeS 2), as confirmed by sulfur isotopes, and its neutral nature is maintained by buffering via the primary carbonates. The rich oxidation zone, composed of abundant libethenite (Cu 2 (PO 4)(OH)), pseudomalachite (Cu 5 (PO 4) 2 (OH) 4), and malachite (Cu 2 (CO 3)(OH) 2), appears to play only a passive and negligible role in the mine drainage generation. The copper-and sulfate-laden water is discharged through the lowermost adits in the ore field; inside the adits, blue gel covers the stream and converts slowly to crystalline langite (Cu 4 (SO 4)(OH) 6 •2H 2 O). X-ray absorption spectroscopy on Cu K edge showed that the local structure inside the gel is similar to that in langite. Calculation of saturation indices showed supersaturation with respect to sulfates (langite, brochantite (Cu 4 (SO 4)(OH) 6)), malachite, and copper arsenates and phosphates. Arsenates and phosphates were not found and do not form, probably because of kinetic hindrance. The solubility product of langite was estimated as log K sp = 17.73. Outside of the adits, transmission electron microscopy showed redox cycling of copper via the formation of nanocrystals of native copper on rock-forming sheet silicates. The copper concentrations are naturally attenuated, being reduced by a factor of 100 once the mine drainage reaches the Hutná river, about 1 km away from the discharge site. Sulfur isotopes document that no copper sulfides are precipitating; copper must be removed from the contaminated water in the form of sulfates or carbonates. The natural attenuation could be responsible for the enrichment of hyporheic sediments with copper whose mineralogy and geochemistry is unknown but its size is estimated to several metric tonnes of copper.

Nova Biotechnologica et Chimica, 2019

Sulphur-oxidising autotrophic bacterial communities in deep biosphere from weathered ore samples ... more Sulphur-oxidising autotrophic bacterial communities in deep biosphere from weathered ore samples from active gold mine Hodruša-Hámre, Slovakia were analysed using cultivation approach followed by DNA extraction, PCR amplification and 16S rRNA gene analyses. Indirect measurement of pH changes in cultivation media evidenced the presence of acidophilic bacteria with active production of acids. The decrease of pH was observed at the beginning of isolation and later pH in range of 1.5 – 2 was maintained in both, sulphuric acid and thiosulphate, media. The presence of homogenous population of gram-negative rods was proved by Gram staining. Molecular analyses have revealed that the population of sulphur-oxidising bacteria in gold mine is dominated by a single species of Aciditiobacillus genus, identified as A. albertensis, suggesting the low level of autotrophic bacteria diversity in deep deposits. For the first time this species was isolated from weathered rocks of a gold mine subsurface ...

Mineralogical Journal, 2019

Vibrational Spectroscopy, 2016

Abstract Raman spectroscopy was used to investigate the lead–antimony sulfosalts minerals: boulan... more Abstract Raman spectroscopy was used to investigate the lead–antimony sulfosalts minerals: boulangerite (Pb5Sb4S11), jamesonite (FePb4Sb6S14), robinsonite (Pb4Sb6Sl3) and zinkenite (Pb9Sb22S42). Raman bands of the investigated minerals that have interconnected SbS3 pyramids are found between 375 and 50 cm−1. The stretching and bending modes of SbS3 groups occur between 375 and 175 cm−1 in boulangerite, 350 and 180 cm−1 in jamesonite, 350 and 175 cm−1 in robinsonite and zinkenite. The investigated minerals show approximate similarities in their spectral features with those of minerals containing pyramidal SbS3 groups.

Mikrobiologicka analýza siestich vzoriek makkeho sintra z troch jaskýň Slovenska prokazala bohatý... more Mikrobiologicka analýza siestich vzoriek makkeho sintra z troch jaskýň Slovenska prokazala bohatý výskyt psychrotrofných bakterii a mikroskopických hůb.

Mineralogical Journal, 2015

Complex investigations of tetradymite Bi 2 Te 2 S from Župkov area (Slovak Republic) found as mus... more Complex investigations of tetradymite Bi 2 Te 2 S from Župkov area (Slovak Republic) found as museum sample in Lviv National University is carried out by methods of electronic microscopy, local microprobe analysis and X-ray diffraction. It is established, that tetradymite occur as almost perfectly shaped crystals of rhombohedral and pinacoidal habits or as crystals with habit transitive between them. The main simple forms of crystals established are {0001}, {1011} and {0112}. Tetra dymite crystals are commonly look like cutted trigonal pseudo-pyramids, lamellar crystals as well twinned formation of tetrade-crystals. Chemical composition of the mineral has established based on data of statistical distribution of atoms into crystallochemical positions and tetradymite formula is established to be similar to Bi 1.86 Sb 0.14 Te 2 S 0.94 Se 0.06. Crystalline structure of the mineral is specified by using Rietveld method. The historical importance of the studied samples is also considered. Some data on tellurides of tetradymite group obtained earlier at their studying in the frame of joint international project "Comparative mineralogo-geochemical analysis Аu-Ag-BiTe -Se of mineralization in neovolcanites of Ukraine and Slovakia (region Carpathians)" carried out 2008-2010 years are also used.

Geochemistry International, 2006

... Prokof&#x27;ev, S. Jelen, M. Gaber, 2006, published in Geokhimiya, 2006, No. 2, pp. 1... more ... Prokof&#x27;ev, S. Jelen, M. Gaber, 2006, published in Geokhimiya, 2006, No. 2, pp. 141–160. ... Prokof&#x27;ev*, S. Jelen***, and M. Gaber*** *Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. ...

Journal of Geosciences, 2015

Rare Cu-Bi sulphosalt, hodrušite, occurs in the Rozália vein (levels X-XIV of the Rozália mine, H... more Rare Cu-Bi sulphosalt, hodrušite, occurs in the Rozália vein (levels X-XIV of the Rozália mine, Hodruša-Hámre ore deposit near Banská Štiavnica, central Slovakia) in two unusual morphological forms. The first type are brownish bronze thin acicular striated crystals, up to 3 mm long, in drusy cavities of quartz-hematite gangue, which are usually grouped into chaotic or irregular aggregates. The second hodrušite type comprises flattened columnar aggregates, up to 1.5 cm long, overgrown by hematite in quartz gangue. These aggregates are distinctly striated with brownish bronze colour and metallic lustre. Abundant Wand Al-rich hematite, chalcopyrite, kaolinite/dickite, siderite, baryte, rare bismuthinite and kupčíkite were found in the association. The earliest columnar aggregates of hodrušite are locally substantially replaced by bismuthinite; these hodrušite-bismuthinite aggregates are further intensively pushed back by hematite displaying Wand Al-rich zones. Acicular crystals of hodrušite in gangue cavities were later than bismuthinite and hematite and their formation was related to remobilisation of Cu and Bi from earlier altered gangue. Powder X-ray diffraction data and chemical composition of both hodrušite types are similar; their unit-cell parameters were refined (monoclinic space group C2/m) as: a 17.552(5), b 3.905(1), c 27.167(9) Å, β 92.44(3) o , V 1860.5(9) Å 3 (acicular crystals) and a 17.567(2), b 3.9151(7), c 27.155(5) Å, β 92.43(1) o , V 1865.9(4) Å 3 (columnar aggregates). Cu-for-Bi substitution is characteristic of both hodrušite types; it influences calculated N chem values (0.98-1.33) to the point that it is impossible to distinguish hodrušite (ideal 1.5) from kupčíkite (ideal 1.0). The problem is resolved by Fe and Ag contents: kupčíkite has more than 2 at. % Fe, cuprobismutite contains more than 2 at. % of Ag; hodrušite usually has Ag and Fe contents below 2 at. %. Hematite is remarkable for its high WO 3 content reaching 4.96 wt. % (0.04 apfu), extremely unusual of a hematite from hydrothermal vein mineralization. Tungsten probably enters the hematite structure via the 2Fe 3+ ↔W 6+ +□ substitution.

The Canadian Mineralogist, 2012

An interesting association of the Bi sulfosalts was identified in the Rozália mine, Hodruša-Hámre... more An interesting association of the Bi sulfosalts was identified in the Rozália mine, Hodruša-Hámre, Slovakia. Sulfosalts of the cuprobismutite series are the most common, and occur in paragenesis with other Bi sulfosalts, chalcopyrite and hematite. Members of the pavonite homologous series are associated with bismuthinite derivatives and quartz of the amethyst variety. Three members of the cuprobismutite homologous series and four members of the pavonite homologous series have been found in a hydrothermal base-metal mineralization in the Rozália mine. Kupčíkite has the structural formula (Cu 6.73 Fe 1.10) S7.83 (Bi 9.49 As 0.36 Ag 0.24) S10.09 (S 18.89 Se 0.13) S19.02 ; that of hodrušite is (Cu 7.69 Fe 0.38) S8.07 (Bi 11.22 As 0.34 Ag 0.53) S12.09 (S 21.99 Se 0.17) S22.16 , and that of cuprobismutite is (Cu 7.47 Fe 0.14) S7.61 (Bi 12.81 As 0.69 Ag 1.38) S14.88 (S 23.85 Se 0.22) S24.07. Makovickyite has the structural formula Cu 1.14 Ag 0,99 Pb 0.13 Bi 5.07 S 8.94 Se 0.06 ; that of pavonite is Cu 0.43 Ag 0.82 Fe 0.03 Pb 0.19 Bi 2.84 S 4.96 Se 0.04 , that of dantopaite is Cu 2.29 Ag 3.68 Fe 0.12 Pb 1.32 Bi 12.02 S 21.85 Se 0.15 , that of benjaminite is Cu 1.13 Ag 2.26 Fe 0.16 Pb 0.76 Bi 6.51 S 11.91 Se 0.09, and that of mummeite is Cu 1.44 Ag 2.61 Fe 0.41 Pb 0.95 Bi 6.70 S 12.93 Se 0.07. The associated sulfosalts are paděraite, berryite and members of the bismuthinite-aikinite series (bismuthinite, gladite, krupkaite, lindströmite, friedrichite and aikinite).

Conference title - Proceedings of the conference Gold in Slovakia, Copyright - GeoRef, Copyright ... more Conference title - Proceedings of the conference Gold in Slovakia, Copyright - GeoRef, Copyright 2012, American Geosciences Institute., Date revised - 2000-01-01, Language of summary - Undetermined, Number of references - 22, Pages - 175-178, ProQuest ID - 52394178, Document feature - sects., SubjectsTermNotLitGenreText - Carpathians; Europe; gold ores; host rocks; igneous rocks; Mesozoic; metal ores; metallogenic epochs; metallogenic provinces; mineral deposits, genesis; mineral exploration; mineralization; occurrence; Paleozoic; structural controls; tectonics; volcanic rocks; Western Carpathians, Last updated - 2012-06-07, CODEN - MSLOBI, Corporate institution author - Chovan, Martin; Putis, Marian; Nemeth, Zoltan; Mato, L'uboslav; Andras, Peter; Jelen, Stanislav, DOI - 2000-009674; 0369-2086; 1338-3523; MSLOBI