Record details

    Polymetamorfně přepracované, páskované a silicifikované magnetitové rudy v desenských rulách (silesikum, Česká republika)
Statement of responsibility
    Arno Mücke, Zdeněk Losos
Other titles
    Polymetamorphic overprinted and silicified banded magnetite ores from the Desná gneisses (Silesicum, Czech Republic)
    Losos, Zdeněk
    Mücke, Arno
Source title - serial
    Acta Musei Moraviae, Scientiae geologicae
    Roč. 85
    s. 47-80
    12 obr., 12 fot., 10 tab.
    Anglické resumé
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Acta Mus. Morav., Sci. geol.
Subject group
    chemismus minerálů
    geneze ložiska
    rudy Fe
    textura páskovaná
    vrásnění variské
Geographical name
    Vernířovice (Šumperk)
Abstract (in english)
   Magnetite ores of the Desná Group in Silesicum represent metamorphosed and silicified banded iron ores, primarily of magmatic origin, similar to the "Itakpe" ore type in Nigeria. Mn-rich bands consisting mainly of spessartite dominated rocks are also present in the heterogeneous ores. They are suggested to be identical to the gondites - silicate facies of iron formation (type Algoma). The Itakpe banded iron ore deposit in Nigeria is connected with basic intrusions which were metamorphosed during the Pan African orogeny (about 580 Ma). The basic rocks are represented by gabbros with tschermakite hornblende which occur in the form of apophyses in "Basement-Complex" (of Liberian age) which is composed of biotite-sillimanite gneisses (Mücke, Neumann 1986). In the case of magnetite ores in the Desná Group the situation is similar: basic ore-rich apophyses of tholeitic character and related to the type of Sobotín basic body penetrated the Desná gneisses.
   Heterogeneous ores and host rocks were subsequently affected by retrogressive variscian metamorphism, tectonized and intensively silicified
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    11. 6. 2007
Import date
    8. 8. 2012