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对浙江新昌玄武岩、花岗岩风化壳红土和江西南昌第四纪沉积型红土剖面的磁学特征进行了分析,结果表明,同一气候区内风化壳红土的磁学特征受母质特征影响较大。随着风化强度的增加,强磁性的玄武岩风化壳磁化率先减小后增加,磁性矿物颗粒先变粗后变细,弱磁性的花岗岩风化壳磁化率逐渐增加,磁性矿物颗粒逐渐变细。第四纪沉积型红土剖面中,均质红土磁化率远大于网纹红土,磁性矿物颗粒亦较网纹红土层细。这些差别说明了第四纪沉积型红土剖面中均质红土与网纹红土不完全相同的物质来源。
The magnetic characteristics of the Xinchang basalts, the granite weathered crusts and the Quaternary sedimentary-type laterite sections in Nanchang, Jiangxi Province are analyzed. The results show that the magnetic characteristics of the weathered crust laterite in the same climatic zone are greatly influenced by the parent material characteristics. With the increase of weathering intensity, the magnetic susceptibility of the ferromagnetic basalt weathering crust decreases first and then increases. The magnetic mineral particles coarsen first and then become thinner. The magnetic susceptibility of the weaker magma weathering crust increases gradually and the magnetic mineral particles become narrower. In Quaternary sedimentary red soil profile, the susceptibility of homogeneous laterites is much greater than that of ettringite, and the magnetic minerals are also thinner than that of reticulate laterite. These differences show that the Quaternary sedimentary laterite profile homogeneous red clay and reticulate laterite are not exactly the same source of material.