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Skład chemiczny wód porowych górnoplejstoceńskiej sekwencji lessowo-glebowej w Zaprężynie (SW Polska)

100%

Skurzyński J. , Modelska M. , Raczyk J. , Staśko S. , Jary Z.

Przegląd Geologiczny

2017

tom Vol. 65, nr 11/2

1383--1387

The article presents the preliminary results of pore-water chemistry studies of the entire Upper Pleistocene loess-paleosol sequence in Zaprężyn (SW Poland). The pore-water chemical composition provides information about behaviour of the elements in the loess profile during the rock-water interactions. The applied method of ex situ water extraction allows only obtaining slightly bound water, which determines physicochemical parameters of the ground. The considerable variability of the values of pH, EC and concentrations of Al3+, Fe3+, Mn2+, Mg2+, Ca2+, Na+, K+, SO42-, Cl- ions and SiO2 was caused by stratification of sediments. The effect of reduced-permeability barrier on the increased concentrations of some ions was also found.

Luminescence chronostratigraphy for the loess deposits in Złota, Poland

72%

Moska P. , Adamiec G. , Jary Z. , Bluszcz A. , Poręba G. , Piotrowska N. , Krawczyk M. , Skurzyński J.

2018

tom Vol. 45, no. 1

44--55

Loess formations in Poland display a close relationship with cooling and warming trends of the Northern Hemisphere during the Pleistocene. Loess sequences sensitively record regional palaeoclimatic and palaeoecological changes. The Złota loess profile (21°39’E, 50°39’N) provides a unique opportunity to reconstruct climate conditions in the past in this part of Poland. This continuous sequence of loess and palaeosol deposits allows to distinguish between warmer and more humid climate which is favourable for soil development and much colder and dry periods which are conducive to loess accumulation. The silty and sandy aeolian material originates mainly from weathered rock surfaces affected by frost shattering or from glaciofluvial/fluvial deposits of river flood plains. In Poland, loess and loess-like formations occur in the southern part of the country, mostly in the south polish uplands, i.e. in the Lublin, Sandomierz, and Cracow Uplands. We used different techniques to establish a chronological framework for this site. 21 samples for luminescence dating were collected from the investigated loess profile in Złota. Infrared post-IR IRSL dating method was applied to the polymineral fine grains (4–11µm). The dating results are accompanied by detailed analyses of the geochemical composition, organic carbon and carbonate. Also, analysis of magnetic susceptibility and grain-size distribution were investigated. Based on such a large stratigraphic dataset an age-depth model using OxCal has also been constructed for this site.