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一、問题的提出根据野外工作結果,看出△Z曲綫常常兩边不趋近於横軸(△Z=0),或者△Z曲綫兩边出現不同强度的正常場。前者在作△T向量时,其交点交得会比实际深(当然有时会不出交点);后者可能使得即使可以产生交点,也不很好交在一起。在两种不同磁化率岩石之接触帶上的磁異常,有时接触帶中有磁性物体存在,異常屬於綜合的。有时仅是接触帶本身的影响。这里仅談一下第二种情况,分析沒有磁性矿体存在时,接触帶上異常是什么引起的,和怎样計算接触带所产生的異常。
First, the problem raised According to the field work results, see △ Z curve often do not tend to be close to the horizontal axis (△ Z = 0), or △ Z curve appears on both sides of the normal strength of different intensity. Former △ T vector, the intersection of the intersection will be deeper than the actual (of course, sometimes there will be no intersection); the latter may make even if it can produce the intersection point, not very good together. Magnetic anomaly on the contact zone between two rocks with different magnetic susceptibility, sometimes with the existence of magnetic objects in the contact zone, is an anomaly. Sometimes it’s just the effect of the contact strip itself. Here only talk about the second case, the analysis of the absence of magnetic ore body, the contact zone is caused by anomalies, and how to calculate the contact zone produced by the abnormal.