Skały podłoża kaolinu w kopalni Turów II (Sudety Zachodnie)

Abstract

ROOKS IN SUBSTRATUM OF KAOLIN AT MINE TURÓW II (WESTERN SUDETES)SummaryPrimary kaoline has been found to occur under the Tertiary deposits in the opencast of brown coal Turów II. In the substratum of the koalin series the authors have distinguished the following rocks: Rumburk granites, albite gneisses, microcline-albite gneisses leucogranites and quartz- muscovite greisens. The Rurmburk granite is the predominating rock type in the substratum of kaolin. The results of the chemical analyses of albite gneisses, leucogranite and greisens have been presented in Table 1. As concerns the content of dark constituents and alkalies these rocks are very differentiated. It was ascertained that some rocks of the substratum had been subject to leucocranic and albitization processes in la period considerably preceding their kaolinitization. Both the primary petrographical differentiation of the material and the complex of later processes are responsible for relatively marked mineral-chemical variation in the substratum rocks of the kaolin.A considerable petrographical differentiation of rocks, particularly the presence of rocks rich in dark components can be a cause of changing quality of the kaolin raw material.