Bąk, K. & Drygaś, W., 1992. Petrographic composition of the weathering waste, deluvial and alluvial deposits in the surroundings of the Czarny Staw Gąsienicowy lake, High Tatra Mountains. Księga Pamiątkowa Instytutu Geografii WSP w Krakowie, 1: 147-162.

Summary: This study is a continuation of the research of the youngest Holocene deposits accumulated above the timberline in the High Tatra Mts. It includes an analysis of the mineralogical composition of the basement rocks and the petrographic composition of the detrital material in the surroundings of the Czarny Staw Gąsienicowy lake. The samples of deposits have been taken from various depositional environments around the lake, from the ridges, chutes and alluvial talus cones, in their aerial and aquatic parts. Five types of granitoids have been distinguished within the samples of the debris material on the base of macroscopic studies. Their mineralogical composition was studied by planimetric measurements of the rocks in the thin sections. It was interesting to qualify, if there is possibillity showing the directions of the transport on the base of mineralogical composition. In order to attain of that, the analysis of petrographic composition of the debris in three fractions has been made. The comparison of results of this analysis does not give the light view on the petrographic differentiation of the source area for the material supplying to Czarny Staw Gąsienicowy lake. In this way, it was impossible to estimate the transport directions of the material to the lake. In next stage of analysis the petrographic composition of the fine-grained weathering waste and the deluvial material was made. Their results have been correlated with the mineralogical composition of granitoids and compared between the respective samples. The highest content of the quartz in the fractions bigger than 0,5 mm reflects the effect its the best resistance on weathering processes. Distribution the highest values among the feldspars show the effect of processes of the granular disintegration. Feldspars occur as the big crystals in granitoids, but in weathered material they appear in the abundance among sma1l grains (0,12-0,06 mm). The grains of muscovite and biotite demonstrate similar features. There have been determined the mutual similarity of the deposits suplied from different depositional environments. This analysis has been carried out using the statistical method of the number taxonomy, based on the mean taxonomy distance. There have been distinguished groups of the samples, with common petrographic features. These results show the distinct similarity according to petrographic composition between the deposits of the alluvial talus cones in their aquatic part. It could be caused by an other type of the depositional processes, which took place in an aquatic environment.