Abstract:

Mineral magnetic parameters and SiO₂ contents were measured on a typical soil profile at quartz sand industrial area in Fengyang County, Anhui. Results showed that the magnetic mineral content of the soil profile was low, and the magnetic property was controlled by the maghemite. The soil profile from top to bottom can be divided into three magnetic layers, and the magnetism gradually became weaken from the first layer to the third layer. The magnetic property of the third layer was mainly controlled by the soil parent material. The first layer had obviously magnetic enhancement phenomenon, which may be caused by secondary maghemite and combustion. The magnetic parameters and SiO₂contents showed that the first layer of the soil profile had been polluted by weakly-magnetic quartz tail sands. In the dilution of quartz tail sands, the magnetic structure of the first layer had changed, and the magnetic mineral content reduced. The combined characteristics of magnetic parameters and SiO₂ contents can reflect the pollution process of the first layer soil by quartz tail sands.

Key words: quartz tail sand, SiO₂ content, soil, magnetic property