Chemismus hornin macošského a líšeňského souvrství ve velkolomu Mokrá (Moravský kras)

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Title in English	Chemistry of rocks of the Macocha and Líšeň formations in the Mokrá Quarry (Moravian Karst)
Authors	ZIMÁK Jiří ŠTELCL Jindřich DALAJKOVÁ Kristýna DONOCIK Jan KOPECKÁ Lenka
Year of publication	2016
Type	Article in Periodical
Magazine / Source	Acta Mus. Moraviae, Sci. geol.
MU Faculty or unit	Faculty of Science
Citation
Web	http://scigeo.actamm.cz/cs/chemismus-hornin-macosskeho-a-lisenskeho-souvrstvi-ve-velkolomu-mokra-moravsky-kras/
Keywords	Moravian Karst; limestone; shale; rock chemistry; trace elements; cement raw materials
Description	The quality of cement clinker is related to the chemistry of the raw materials (typically limestone and clay or shale and other materials) used. The paper provides detailed information about chemistry of rocks of the Macocha and Líšeň Formations quarried as raw materials for cement production in Mokrá in the southern part of the Moravian Karst (north of the town of Brno). The Vilémovice Limestones is the only lithostratigraphic member of the Macocha Formation in the Mokrá Quarry. Massive Vilémovice limestones are very pure with only 1.5 wt. % SiO2 and 0.4 wt. % Al2O3 on average. A nodular variety of Vilémovice limestones has increased contents of SiO2 (3.3 wt. % on average), Al2O3 (1.5 wt. %) and also alkalies, represented mainly potassium (0.3 wt. % K2O). Rocks of the Líšeň Formation are composed of a carbonate component (calcite) and a non-carbonate component (dominantly quartz and muscovite / illite), whose quantitative ratio is highly variable Limestone of the Líšeň Formation (sometimes very pure) pass into calcareous shale due to increase in non-carbonate component and then into silty shale containing only a few percent of calcite. This corresponds to the wide variability of CaO, SiO2, Al2O3 and alkalies (K > Na). The K2O content in shales of the lithostratigraphic member Hády-Říčka Limestones is in the range of 2.3 to 4.4 wt. % (3.3 wt. K2O on average). In the article are presented and discussed the contents of a series of minor and trace elements (P, Ti, S, Fe, Mn, Sr, Rb, Zr, As, Cu, Zn, Pb and REE).