Abstract：Special magnetic characteristics of urban topsoils are shown as a result of anthropogenic pollution compared to those of the natural soil. Study on environmental magnetic characteristics was conducted on the Xuzhou urban topsoils and the results indicated that the magnetic characteristics were dominated by the multi-domain / single domain ferri-magnetic minerals. Anti-ferromagnetic minerals had a little contribution to the magnetic enhancement. SEM/EDX of magnetic minerals extracted from the representative soil samples revealed the presence of typical large spherules, consisting of a great of iron, probably due to anthropogenic inputs. Magnetic characteristics of different profiles at varying depths also revealed that magnetic minerals from anthropogenic sources were confined to 0～30cm layer, so the pressure of magnetic minerals from anthropogenic inputs may be assessed through magnetic characteristics of 0～30 cm urban soils.
2005, Vol. 23 
