Zastosowanie metod petrograficznych do klasyfikacji genetycznej osadów czwartorzędowych na wybranym przykładzie

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SUMMARY

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Quaternary· deposits from drillings and exuvations made in the area of Mala Panew valley

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the upper Silesia were analysed. The results of tPetrograpbic analyses of gravels of the 2-5 mm and 5-10·

mm

fractions and heavy minerals of the 0.1--0.25 mm fraciiml are plotted on classification tl"iangles mustrating degree of weathering. The for-mer are plotted on the triangles fraction (Figs. 2 a:nd 3 fO!' the 2-6 mm and 6--10 mm fractions, respecti-vely) with peaks representing the sum of: K

-quartz, Kr - crystalldne rocks, and 0 - sedimentary

· rocks. The latter are plotted on the triangle (Fig. 1) with peaks representing the sum of: T - perSistent., ·ST - 6eri1ipersistent, and N - impersistent minerals. The tills representing the Mid-Polish and Cracow Glaciatdons appear to \be markedly similar in petro· grapbic composition, markedly differing from Eo);ile-istocene deposits. Samples taken from excavations

·.are strongly. weathered. similarly as tlle tills of the

· Mld-Polish Glaciation sampled on even fairly large depths. Tbls evkiences intensity of interglacial and

.. periglacial weathering. Arrows. on the Figures 2--3 indicate location of samples of solifludion loams in. re18tl()nto samples of tills derived from the same

· boo:ehole. According to the present authOr the method

. discussed ·here makes it poS9ible to. discriminate tills and fossil sOt"ifluction wams taking into account im-. povedshmeilf· of .the latter in less resistant compo.

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