石英砂工业区内土壤剖面的磁学特征及其环境意义

Magnetic Properties of Soil Profile in Quartz-sand Industrial Area and the Environmental Significance

对安徽凤阳石英砂工业区土壤剖面的磁学参数和Si O2含量进行测试,结果显示:土壤剖面磁性矿物含量低,磁学性质由磁赤铁矿控制,土壤剖面由上而下可分成3个磁性层;从第一层到第三层磁性逐渐减弱;第三层磁学性质主要由成土母质决定,第一层存在明显的磁性增强现象,引起这种现象的原因可能是次生磁赤铁矿和燃烧作用。磁学参数和Si O2含量显示土壤剖面的第一层已被弱磁性石英尾砂污染,在石英尾砂的稀释作用下,其磁性结构特征发生了改变,磁性矿物含量降低。土壤剖面的磁学参数组合特征及Si O2含量反映了弱磁性石英尾砂对第一层土壤的污染过程。

Mineral magnetic parameters and Si O2 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 Si O2 contents 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 Si O2 contents can reflect the pollution process of the first layer soil by quartz tail sands.