安徽凤阳石英岩发育土壤的磁学性质及环境磁学意义

Magnetic Property and Environmental Magnetism Significance of Soil Derived from Quartz in Fengyang County, Anhui Province

通过对安徽凤阳石英岩发育土壤典型剖面的磁学参数测量,结果表明,A层和B层中的磁性矿物含量明显高于C层,且A层和B层中磁性矿物的粒度明显比C层细。C层的磁学性质由磁铁矿主导,A层和B层的磁学性质由磁赤铁矿主导。磁赤铁矿是石英岩在成土过程中形成的次生矿物。土壤中磁赤铁矿的出现及含量的变化指示成土作用的强弱。石英岩的磁性对土壤的磁性影响甚小,而成土作用和生物作用对土壤磁性增强起到了主要作用。

Mineral magnetic parameters were measured on typical soil section derived from quartz in Fengyang County, Anhui Province. Results showed that the contents of magnetic minerals in A layer and B layer were obviously higher than C layer, and the particle sizes of magnetic minerals in A layer and B layer were obviously smaller than C layer. Magnetite dominated magnetic properties of C layer but maghemite dominated A layer and B layer. Maghemite was secondary mineral formed in the process of pedogenesis. The appearance of maghemite in soil and the change of its content can reflect process of pedogenesis. The magnetic enhancement of soil showed that quartzite magnetism had little influences to the magnetism of soil, but pedogenesis and biological action influenced it obviously.