HR: 1340h
AN: GP53B-1219    [Abstracts]
TI: Magnetic Susceptibility and Geochemistry of Soils and Alluvial Sediments in the Area of Vistula River Delta (N Poland).
AU: * Nawrocki, J
EM: jerzy.nawrocki@pgi.gov.pl
AF: Polish Geological Institut, Rakowiecka 4, Warszawa, 00-975, Poland
AU: Polechońska, O
EM: olga.polechonska@pgi.gov.pl
AF: Polish Geological Institut, Rakowiecka 4, Warszawa, 00-975, Poland
AB: Magnetic iron minerals, whose presence in soils can easily be detected by magnetic susceptibility measurements, are components of numerous industrial dusts. There is a linear dependence between magnetic particles content and content of heavy metals like: Cu, Fe, Pb and Zn (in urban dusts). A similar dependence was observed in atmospheric dusts (for Pb, Cu, Zn, and Cd). If the origin of magnetic particles and a considerable part of heavy metals permeating into soils as a result of industrial emission or imission is the same, the application of magnetic susceptibility measurements for the detection of potential high risk-areas is possible. Studies of magnetic susceptibility of alluvial sediments, beach sands, soils and subsoils were conducted in the area of Vistula river delta (N Poland). Maps of magnetic susceptibility were prepared basing on laboratory measurements, using Bartington MS2 device. The magnetic susceptibility pattern was compared and correlated with available geochemical determinations that were elaborated for the same sample set. Positive correlation is observed between magnetic susceptibility of topsoils and such elements as Ba, Co, Mg, Mn and Ni. Differential map, constructed as a difference between maps of topsoils and subsoils, might be a useful tool for preliminary detection of heavy metal pollution in soils. Negative anomaly observed at this kind of map suggests natural origin of increased susceptibility. A direct link between lithology of surrounding bedrocks and susceptibility values of soils and alluvial sediments is evident. A very high values of magnetic susceptibility reflect anthropogenic pollution of soils in the areas of big cities and industrial centrums. There is no such relationship in the case of magnetic susceptibility of alluvial sediments. The anthropogenic pressure is cumulated in the coastal zone of the Baltic Sea, where alluvial and beach sediments display the highest values of magnetic susceptibility.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 1512 Environmental magnetism
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting