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Zróżnicowanie petrograficzne i mineralne równowiekowych glinmorenowych z wybranych obszarów Niżu Polskiego

Kenig K.

Przegląd Geologiczny

2004

Vol. 52, nr 4

325-330

Petrographic and mineralogical parameters of tills were studied in the region of Piła (NW Poland), Olsztyn (NE Poland) and Siedlce (E Poland). Lithostratigraphic zonation is introduced, based on values of petrographic coefficients. Petrographic parameters and heavy mineral com position of the tills differ between studied areas. Tills from the Piła region contain more resistant minerals (49.60–1.2%), then non-resistant ones (21.9–46.2), while similar characteristics are typical only for the lower strata in the Olsztyn area. Also the glauconite content var ies marekedly, from 0.6 % near Piła to 6 % near Olsztyn. The carbonate minerals are more abundant in the Olsztyn region (2.2–23.2%) than in the Piła area (1.3–7.1%). In all lithostratigraphic horizons of the Olsztyn region, the transparent minerals predomiate over the opaque minerals. This tendency is less obvious in the Piła region (except for two horizons). Lower and upper lithostratigraphic zones, equivalent to Pleistocene chronostratigraphic stages, were recognized in borecore sections from the study areas.