ANISOTROPY OF MAGNETIC-SUSCEPTIBILITY PARAMETERS - GUIDELINES FOR THEIR RATIONAL SELECTION

被引:25
作者
CANONTAPIA, E
机构
[1] HIG-SOEST Univ. of Hawaii at Manoa, Honolulu, 96822, Hawaii
关键词
MAGNETIC SUSCEPTIBILITY; AMS PARAMETERS; MAGNETIC FABRICS; DEGREE OF ANISOTROPY;
D O I
10.1007/BF00879310
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Twenty-eight parameters used to characterize measurements of the anisotropy of magnetic susceptibility are compared theoretically in this work by introducing the concept of the field of susceptibility tensors, which allows the representation of parameters as families of lines in a plane. It is demonstrated that the foliation and lineation parameters are but a special case of the shape parameters, implying that the resolution of these two rock fabric elements using AMS measurements alone is more an artifact of the numerical range of definition of some parameters than a quantification of two physically independent features. Also, it is shown that parameters presumably of the same type do not necessarily yield equivalent interpretation of results in a qualitative sense, and therefore, caution should be strongly exercised when parameters are to be selected. Parameters quantifying the degree of anisotropy are, in general, equivalent to each other because of the very small departure observed in natural rocks from the isotropic case. However, a final consideration of the possible ability to differentiate rock types and a convenient range of values allowing expression of the degree of anisotropy in a well-defined percentage are pointed out as the main factors to be considered before selecting one parameter within this class.
引用
收藏
页码:365 / 382
页数:18
相关论文
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