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Geoscience ›› 2008, Vol. 22 ›› Issue (5): 889-894.

• Engineering Geology and Environmental Geology • Previous Articles     Next Articles

Magnetic Influence of Quartz Tail-sands on the Dry Top Soil and Its Environmental Implications

  

  1. 1College of Sciences,Anhui Science and Technology University,Fengyang,Anhui233100,China;
    2State Key Laboratory of Geological Process and Mineral Resources,China University of Geosciences,Beijing100083,China
  • Received:2008-04-10 Revised:2008-09-10 Online:2008-10-20 Published:2009-11-12
  • About author:李勇,男,硕士研究生,1975年出生,固体地球物理专业,主要从事环境磁学研究。 Email:liyong197510@163.com。
  • Supported by:

    安徽科技学院引进人才基金项目(ZRC2007103);高等学校学科创新引智计划项目(B07011)。

Abstract:

Magnetic measurements have been undertaken on quartz tailsands, dry top soil, tailsandsinfluenced top soil and town top soil of Fengyang,Anhui. Results show that magnetic properties of the four kinds of samples are evidently different. Although magnetite dominates the susceptibility of the four kinds of samples, there are some maghemites in dry top soil, some iron hydroxides (e.g.lepidocrocite) in quartz tail-sands and town top soil and some iron hydroxides (e.g.lepidocrocite), maghemite in tailsandsinfluenced top soil. The content of magnetite in the town top soil is apparently more than that in the other three kinds of samples. The content of magnetite in the tail-sands-influencedtop soil is between that in the quartz tail-sands and dry top soil. Magnetite grains of town top soil is finer than 1μm; those of quartz tail-sands are larger than 0.1μm, and those of dry top soil are smaller than 0.1μm, while those of tail-sands-influenced top soil are between those in the quartz tail-sands and in the dry top soil. Negative correlation lies between the susceptibility and the frequency dependence susceptibility of town top soil, positive correlation lies between those of dry top soil, while no evident correlation lies between those in the tail-sands-influenced top soil. Under the effect of industry processes and traffic, town top soil shows magnetic enhancement. However, the producing of quartz sands results in magnetic reduction of top soil. This is due to less magnetic minerals in quartz sands than that in the dry soil.

 

Key words: Fengyang,Anhui, quartz tail-sands, dry top soil, magnetic reduction

CLC Number: