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The basis of the study of the age of the Holocene diluvium on loess areas of Polish Highlands

Bluszcz A., Poręba G. J., Śnieszko Z.

Geochronometria

2007

Vol. 28

61-66

Large part of slope sediments (pediment) which are the effect of water induced soil erosion in the loess areas of Polish Uplands, has a close relationship with pre-historical, historical and "present" agricultural activity. The sediments accumulated in different periods are often separated by fossil soils. These soils are correlated with the periods of relinquishment of agricultural land use in a given area. A precise dating of the cycles of fossil soil formation is practically impossible. Therefore it is important to gain a possibility to establish the age of sediments between old fossil soils corresponding with the phases of soil erosion. The organic material in the floor or roof of deposits permitting a 14C dating is very seldom. This is why attempts were made to use the OSL method to date mineral parts of slope sediments. In connection with pedological and sedimentological methods, the OSL method makes it possible to give some information about the age of pre-historical and historical phases of intensive soil erosion. In order to date sediments accumulated during the last 50 years, the method based on measurement of 137Cs isotope in products of soil erosion is used. This paper shows some examples of the application of 14C, OSL and 137Cs methods in some selected research sites. In each case there is a discussion of limitations of the methods used.

Concentration and vertical distribution of 137Cs in agricultural and undisturbed soils from Chechło and Czarnocin areas

Poręba G., Bluszcz A., Śnieszko Z.

Geochronometria

2003

Vol. 22

67-72

This paper presents the results of measurements of 137Cs in soil profiles which were sampled in the Chechło and Zalesie areas, on the Proboszczowicka Highland, Poland, May 2002. Samples were collected from four soil profiles, three of them were taken on the cultivated field and one on the undisturbed field. The vertical distribution of 137Cs in collected profiles and the 137Cs inventory for all locations have been determined. The pH of soils (in distilled H2O and KCl solution) and the organic matter content of soil samples were also measured. Caesium concentration ranged from 0.0 to 15.37 Bq/kg and from 0.0 to 101.61 Bq/kg in soils from cultivated and undisturbed sites, respectively. The measured 137Cs deposition has been compared with the nuclear weapon tests caesium fallout. The obtained results show that the Chernobyl 137Cs fallout had relatively large contribution to total 137Cs deposition in the study areas.