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对磁异常解释推断时,往往需要确定磁性体的磁化方向。在弱磁条件下,一般可以认为余磁感磁方向一致而不考虑退磁影响。但在大多数情况下,遇到的是强磁性的磁铁矿体,这时余磁很大,其方向与感磁不一致并有明显的退磁效应,使磁化方向偏离磁化场方向。为了确定剖面內的Js,通常是采集定向标本进行测定,最后根据统计结果求得。显然,这要求矿体一定要有天然
It is often necessary to determine the magnetization direction of a magnetic body when interpreting magnetic anomalies. Under the weak magnetic condition, it is generally considered that the residual magnetic induction has the same magnetic direction without considering the demagnetization effect. However, in most cases, it is a ferromagnetic magnetite body, in which case the remanence is very large and the direction is not consistent with the magneto-inductive and has obvious demagnetization effect, so that the magnetization direction deviates from the direction of the magnetization field. In order to determine the Js in the profile, it is usual to collect the directional specimens for determination and finally to obtain the results based on the statistical results. Obviously, this requires the ore body must have natural