Manganese oxides and associated minerals as constituents of dispersed mineralization of metasomatic rocks in the Dukat ore field

Abstract

Lithiophorite and coronadite-varieties of vernadite and todorokite-make up finely dispersed colloform mixtures along with minor grains and nanoparticles of aluminosilicates and ore minerals in meta somatic rocks of the Dukat ore field, which were formed in local areas of fluid and hydrothermal solution dis charge at the upper level of the ore forming system. Fe vernadite associates with feroxyhyte, magnetite, apa tite, K feldspar, native silver, and acanthite in greisenized granitoids and with epidote, cerianite, plattnerite, and Fe chlorite in quartz-garnet-chlorite propylites. Todorokite with high Pb, Tl, and Sn contents associ ates with epidote, albite, bitumen, and native silver in quartz-epidote-chlorite propylites. Al vernadite, coronadite, and lithiophorite associate with opal, kaolinite, Fe chlorite, zincite, uraninite, native silver, and acanthite in argillisites. These data allowed us to estimate the conditions of manganese accumulation in the epithermal ore forming system and deposition conditions of Mn rich, finely dispersed mineral mixtures in mineralized zones hosted in metasomatic rocks of the ore field.

Dispersed mineralization in granitic rocks in the Dukat ore field, the Russian Northeast: Sources and relationship with epithermal gold-silver and silver-base-metal ores

“…Particles of alloy composites were formed, owing to collecting recrystallization of minerals of sulfide bear ing assemblages, which are enriched in microinclu sions, with participation of aggregation of nanoparti cles under low oxygen fugacity (Filimonova and Trubkin, 2010). The occurrence of relict zircon crys tals, rutile group minerals, and alkali feldspar in the tin-base metal alloy composite shows that the inclu sions subject to recrystallization were formed from the melts of elevated alkalinity.…”

“…The dispersed mineralization of hydro thermal propylites is composed of small particles of native silver; Fe, Cu, Zn, and Ag sulfides; ilmenite; Mn, Pb, and Tl oxides; and Fe, As, Cu, and S com pounds (Filimonova and Trubkin, 2004;Filimonova et al, 2010). An orthogonal block about 2 km 2 in area hosts 16 closely spaced ore bearing zones and more than 60 ore veins with economic Ag grade.…”

Mineralogická charakteristika barytové mineralizace z lokality Ruda-hájenka (hornoměstský rudní revír, silezikum)

“…Navíc cerianit je často popisován z asociace s oxidickými minerály Mn, a to včetně fází z hollanditové skupiny (např. Filimonova et al 2010;Kolitsch a Pristacz 2013;Kolitsch et al 2015;Kolitsch 2017;Volokhin et al 2020).…”

“…5). Cerianit je běžně popisován ze zvětrávacích prostředí bohatých oxidickými fázemi Fe a Mn a z lateritů (Filimonova et al 2010;Kolitsch a Pristacz 2013;Kolitsch et al 2015;Andersen et al 2017;Kolitsch 2017;van Rythoven et al 2020;Volokhin et al 2020;Hutchinson et al 2022;Cook et al 2023). Mn-oxidické minerály jsou často koncentrátorem Ce na redox rozhraních ve vodných roztocích vzhledem ke sblíženým iontovým poloměrům Mn 2+ a Ce 4+ (Piper 1974;Elderfield et al 1981;de Baar et al 1988).…”