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Mineralogy of VMS-type deposits and their comparison with samples from the Tisova deposit
Bulyžkin, Rodion ; Zachariáš, Jiří (advisor) ; Dolníček, Zdeněk (referee)
Mineralogy of VMS-type deposits and their comparison with samples from the Tisová deposit Rodion Bulyžkin Abstract Volcanogenic Massive Sulphides (VMS) deposits are a specific type of mineral deposits that are currently an important source of mineral resources. They are essential for their high metal content used for the industrial and energy sectors of the world economy and the future development of human society. They are rich in both, base and precious metals and therefore deposits of this type are of strategic importance. Their study and exploration provide important information on the formation of mineral resources and the evolution of submarine volcanic systems. They also contribute to a better understanding of geological processes and the evolution of our planet, and makes it possible to discover new reserves of metals (especially copper and zinc ores, which are used in industry, such as electronics, building materials and energy) that can be exploited for future generations. The formation of these deposits is linked to processes that take place near subduction zones or where tectonic plates collide. During these processes, hot solutions and mineral-rich gaseous phases react with the surrounding rocks and seawater. Such contact results in rapid cooling of the hydrothermal fluid and...
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Weathering of arsenopyrite in soils in acidified environment
Soukupová, Lenka ; Mihaljevič, Martin (advisor) ; Drahota, Petr (referee)
Lenka Soukupová, Zvětrávání arsenopyritu v lesních půdách v acidifikovaném prostředí SUMMARY The weathering of arsenopyrite (FeAsS) has been studied at the experimental site Načetín in the Ore Mountains, Czech Republic. There were chosen three areas with different vegetation (beech, spruce a unforested areas) at this site. The arsenopyrite samples were placed in all soil horizons (litter, horizons A, B and C for forest areas; horizons A, B and C for unforested area), where they were exposed to ambient conditions for one year. After one-year weathering, the newly formed secondary minerals were identified and the rate of surface oxidation was determined, both depending on the environment of oxidation. Although physical-chemical parameters and content of main and trace elements of the studied soils varied, the only detected crystalline secondary mineral of arsenic was scorodite (FeAsO4∙2H2O). Nevertheless, this differences affected amount of formed scorodite. The highest concentrations were determined on the surface of the arsenopyrite grains that oxidized in the beech stand, conversely the lowest concentrations were determined on the arsenopyrite grains from the unforested area.
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Weathering of arsenopyrite in soils in acidified environment
Soukupová, Lenka ; Drahota, Petr (referee) ; Mihaljevič, Martin (advisor)
Lenka Soukupová, Zvětrávání arsenopyritu v lesních půdách v acidifikovaném prostředí SUMMARY The weathering of arsenopyrite (FeAsS) has been studied at the experimental site Načetín in the Ore Mountains, Czech Republic. There were chosen three areas with different vegetation (beech, spruce a unforested areas) at this site. The arsenopyrite samples were placed in all soil horizons (litter, horizons A, B and C for forest areas; horizons A, B and C for unforested area), where they were exposed to ambient conditions for one year. After one-year weathering, the newly formed secondary minerals were identified and the rate of surface oxidation was determined, both depending on the environment of oxidation. Although physical-chemical parameters and content of main and trace elements of the studied soils varied, the only detected crystalline secondary mineral of arsenic was scorodite (FeAsO4∙2H2O). Nevertheless, this differences affected amount of formed scorodite. The highest concentrations were determined on the surface of the arsenopyrite grains that oxidized in the beech stand, conversely the lowest concentrations were determined on the arsenopyrite grains from the unforested area.
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