内蒙古曹四夭钼矿床磁测资料显示：区内北东向与北西向磁异常条带交汇部位为一明显的似环状正负磁异常组合带，在中部出现有较大面积的心形低负异常区，其与斑岩体及其内外接触带热液蚀变有关。由于多期次的热液活动，铁磁性矿物遭到破坏，产生蚀变和矿化，使岩石磁性强度降低，形成低负异常区。dc172-2异常与心形低负异常的交界处基本位于蚀变、矿化的中心位置，是寻找与成矿关系密切的中酸性岩体一个突出的找矿标志。%after studying on the magnetic survey data of caosiyao molybdenum deposit inner Mongolia, we suppose that the intersection of ne and nW trending magnetic anomaly strip is a clear ring-shape positive and negative magnetic anomaly combination. it appears a heart-shaped low negative anomaly in the middle of the area, which is related to the porphyry rock mass and its inner and outer contact hydrothermal alteration. due to the hydrothermal activities time after time, the ferromagnetism minerals have been destroyed while alteration and mineralization happened on the rock, which reduced the rock magnetic intensity and formed low negative anomaly area in the deposit. the intersection of dc172-2 anomaly and heart-shaped low negative anomaly is basically located in the center of the alteration and mineralization;it is a prominent ore-prospecting criterion of looking for the mid-acidic rock mass closely associated with the mineralization.
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