Analiza mikrostrukturalna osadów lessowych z Klępicza, Pomorze Zachodnie

Abstract

MICROMORPHOLOGICAL ANALYSIS OF LOESS DEPOSITS FROM KLĘPICZ, WESTERN POMERANIA Summary Loess deposits from Klępicz, western Pomerania, were micromorphologically studied. The sediments belong to periglacial loesses and were deposited at the turn of upper Plenivistulian and late Vistulian (Kozarski & Nowaczyk, 1992). Primary and secondary (periglacial and soil) microstructures were distinguished among them. Abundant till and clay intraclasts probably indicate close source of the material and multiredeposition processes. Clay balls may proove that the loess deposits were primary deposited on slopes. Vertical normal grading was explained as a result of segregation of the silt material in the snow melt water. Among the secondary microstructures, synchronical with periglacial processes, are described: syngenetic microcracks with clastic infillings, abundant deformations of clay laminae, circle structures, silt droplet structures, laminae cementated by clay minerals and iron compounds (so-called limons it doublets, Lautridou & Giresse, 1981). Part of the periglacial microstructures are similar to those in the mesoscale. Soil-forming processes caused haploidization of the upper 1 meter of the sediment (many rhizocrections and burrows of earthworms) and clay and iron translocations (abundant cutans). They were interpreted as a result of the present day (or nearly present-day) processes.