%0 Journal Article
%T Pr車ba wykorzystania wska nik車w geochemicznych do oceny nat  enia wsp車 czesnej sedymentacji deluwialnej i aluwialnej
%A Wojciech Zg obicki
%A Marcin Kozie
%A Lesia Lata
%A Andrzej Plak
%A Marek Reszka
%J Annales UMCS, Geographia, Geologia, Mineralogia et Petrographia
%@ 2083-3601
%D 2008
%I 
%R 10.2478/v10066-008-0004-y
%X Chemical changes of the environment are one of the most important results of human activity. Pollutants migrate with air and water and finally accumulate in sediments that become specific geochemical archives of these changes. Vertical changes of concentration of some elements in sediment profiles may be used for estimation of the sedimentation rate. In the paper, some theoretical bases of application of geochemical markers for dating of contemporary sediments are presented. Researching 8 profiles from the western part of the Lublin Upland, authors evaluate the markers for application in geomorphologic studies (size and sedimentation rate). Studies comprise 4 profiles of alluvial river sediments from western and central parts of the Lublin Upland and 4 profiles from slope sediments. Generally they are mineral sediment types (mainly silts) with peat in some of them. The following elements and isotopes were applied as stratigraphic markers: heavy metals (Cd, Cu, Pb, Zn), phosphorus and 137Cs. The size and rate of contemporary sedimentation was stated on the basis of the depth of the layers revealing pronounced increase of the concentration of selected markers. Applied methods allowed to distinguish three time horizons 每 the sixties, seventies and eighties of the 20th century. Vast scattering of the concentration of the selected elements, especially heavy metals, was noticed in the studied profiles. Their concentration ranged from 0.0 to 10.3 ppm for cadmium, 0.0-1003.0 ppm for copper, 1.9-133 ppm for lead and 3.1 to 73.0 ppm for zinc. Radioactivity of caesium in sediments also ranged markedly from 0.2 to 100 Bq/kg whereas the concentration of phosphorus was stable and equal to 0.2 g/kg. Presented attempt of the estimation of the contemporary sedimentation rate, based on application of several geochemical markers, gave promising though not univocal results. In all the studied profiles much higher concentration of analyzed elements was determined in surface layers, which proves that human activity is the main source of increasing concentration of some elements in surface sediments. However, higher concentrations in surface sediments are partially related to the higher organic matter content. The rate of contemporary sedimentation, determined with the geochemical markers ranged from 0.25 cm/y (alluvia) to maximum 1.1 cm/y (delluvia). These values agree well with the previously published data. Reliability of quantitative data was not the same for all profiles: for some of them the sedimentation rate was stated using three markers, for others from one only. The more pronounced and precise results were obtained for profiles of slope sediments. Obtained results also agree with general morphologic characteristics of the profiles 每 the greatest sedimentation rate was noticed for colluvial profile and the smallest for alluvial sediments of the broad river valley.
%U http://versita.metapress.com/content/w4rj587605205418/?p=ea2de1e306bf4c9f82ad3fd22c4c891b&pi=3