Piroklastyczne osady w warstwach Porębskich (grodzieckich) kopalni Milowice
Abstract
PYROCLASTIC DEPOSITS IN THE PORĘBA BEDS (GRODZIEC) OF MILOWICE MINE
Summary
The article shows that in the Milowice mine the bentonite seam built up of volcanic ashes is covered with psammitic tuffites (pyroclastic sandstones) and crystalline claystones (coal tonstein). The bentonites consisting of illite and montmorillonite, the predominance of which changes along the strike, are thought by the present authors to be a product of sedimentation in a deeper water basin, where pH must have been of high value. The psammitic tuffites were sedimented in a more acid environment, thus the volcanic glass altered mainly into kaolinite, partly also into montmorillonite and muscovite. On the other hand, the coal tonstein bed that occurs in the seam 610 has been formed under acid-humid conditions, as proved by the predominance of kaolinite.
Summary
The article shows that in the Milowice mine the bentonite seam built up of volcanic ashes is covered with psammitic tuffites (pyroclastic sandstones) and crystalline claystones (coal tonstein). The bentonites consisting of illite and montmorillonite, the predominance of which changes along the strike, are thought by the present authors to be a product of sedimentation in a deeper water basin, where pH must have been of high value. The psammitic tuffites were sedimented in a more acid environment, thus the volcanic glass altered mainly into kaolinite, partly also into montmorillonite and muscovite. On the other hand, the coal tonstein bed that occurs in the seam 610 has been formed under acid-humid conditions, as proved by the predominance of kaolinite.